How Supply Chain Issues are Affecting the Fastener Industry

With so much in the news about supply chain issues, many companies who purchase large quantities of fasteners are wondering how they will be affected. The ongoing COVID-19 pandemic has had a universal impact on the supply chain, triggering port congestion, disruptions at Chinese plants, high demand and longer lead times. The fastener industry is not immune to these challenges.

Since the majority of standard commodity fasteners come from manufacturing facilities overseas, and primarily in China, we first must examine the situation at the ports in Long Beach and Los Angeles. Maritime ports and terminals handle over 80% of all internationally traded goods. Factors that cause the disruptions at the ports include stockpiling of goods, containers piling up at the ports, which slows the entire system down –  less space to move containers between docks and ships, less space for trucks, and fewer chassis available because containers are sitting on them, and workforce reductions due to illness.

While the port congestion has caused a delay, significant progress has already been made to clear the pile up. The Department of Transportation has teamed up with local authorities to waive fees, extend working hours, and create grants for ports seeking to clear up congestion and create a more resilient system overall. If this post had been written in September of 2021, we would see dwell times (the average number of days a container has spent on the dock) that were double, sometimes even triple, the pre-pandemic figure. In just one recent week, the number of containers that have been dwelling on the docks for at least nine days has fallen over twenty percent, according to data provided by the ports. In two weeks, the number of ships off the California coast that were waiting to be unloaded went from 111 to 61. It seems we are sure to see delays for at least a while longer, but this situation is quickly getting resolved with the new measures put in place, and should not cause any further problems by early in 2022.

The next issue causing potential supply chain issues for the fastener industry is the ongoing effects of the coronavirus pandemic. At the start of the COVID-19 pandemic, Chinese plants reduced shifts, reduced the number of workers at one facility at a time, and had a shortage of workers due to illness. As vaccines rolled out and more information was available, we saw an increase in production and a short time of progress in the output coming from Chinese plants. However, new variants and outbreaks of COVID have slowed down production again. Industrial production rose 5.3% in August from a year earlier, narrowing from an increase of 6.4% in July and marking the weakest pace since July 2020, data from the National Bureau of Statistics showed. With the emergence of the Omicron variant, some countries (including China) may choose to enact renewed restrictions to control transmission of the newest variant. This will lead to longer lead times, decreased output, and a delay in the final product production. Unlike the delays caused by port congestion, this factor is harder to see the end of, and we can expect some of its effects to linger on deep into 2022, and possibly even into early 2023.

Lastly, there is currently very high demand for fasteners due to the COVID-19 pandemic, as well as the reopening of manufacturing plants that were bottlenecked during coronavirus outbreaks. One sector that is rapidly growing and has seen an increase in demand for fasteners is the medical device industry. Respiratory systems and monitoring equipment, such as ventilators, all require very specific assembly, including fasteners. Overflow hospitals were built throughout the world and continue to be built in order to meet anticipated needs more quickly. Additionally, with the new infrastructure law now signed by President Biden, we’re likely to see demand increase rapidly for domestically manufactured fasteners.

When you combine all of these factors, we anticipate mixed effects to the fastener industry’s supply chain. Where the port congestion will surely improve, the effects of the ongoing pandemic are lesser known, and the increased demand caused by new initiatives and backed up factories will likely increase lead times. For assistance in making sure your fastener supply isn’t impacted by supply chain issues, contact Mudge Fasteners at (800) 634-0406.

Kyle Domer
Are DURA-CON or Molykote Fasteners Better for Solar Installations?

DURA-CON Corrosion Resistant Fasteners

Because PV solar arrays are exposed to harsh weather conditions, the fasteners included in their mounting systems should always have a high level of corrosion resistance. While many engineers choose standard stainless steel fasteners due to their longstanding reputation for corrosion resistance, there are actually better options.

DURA-CON and Molykote are newer proprietary coatings marketed for use in solar panels installations and other outdoor environments. Both of these coating claims to have both corrosion resistant properties and properties meant to decrease the friction coefficient of the assembly to reduce the possibility of galling.

While there is limited independent test data for Molykote fasteners, DURA-CON Corrosion Resistant Fasteners have been specifically tested in aluminum solar panel racking materials, withstanding 1500 hours of Salt Spray per ASTM B-117 with zero corrosion.

DURA-CON Salt Spray Test Results
Click to enlarge.

DURA-CON Fasteners employ a three layer coating system that consists of an inorganic zinc-rich first coat and an aluminum-rich organic second coat. Friction modifiers are integrated into the topcoat, resulting in repeatable torque tension characteristics during assembly. Molykote fasteners are said to have a “paint-like” solution applied to them to reduce friction, but without supporting test data.

Additionally, the proprietary DURA-CON coating allows for use of Grade 5 bolts, which are stronger than A307 zinc, hot dip galvanized or 300 series stainless steel bolts. All of this adds up to a finished product that is high strength, with high corrosion resistance, and no galling.

If you’d like more information or pricing for DURA-CON Corrosion Resistant Fasteners, contact Mudge Fasteners at (800) 634-0406. You can also buy DURA-CON fasteners online at www.fastenerexpert.us.

Kyle Domer
Solar Trends in 2022 and How They Relate to Fasteners

Solar energy has been a fast-growing industry around the world since the mid-2000s, with Mudge Fasteners first launching the Solar Fastener Expert program in 2008. Here’s a look at where it’s headed in 2022.

Experts predict that the solar sector will grow at an average of 13% per year between 2020 and 2030. Forecasters anticipate that approximately 42 million people will work with renewable energy systems by 2050.

The U.S. solar market is expected to hit $22.9 billion by 2025. The Solar Energy Industries Association (SEIA) projects that over the next five years, installations will more than double in solar capacity, surpassing 100 GW by 2022. Over 242,000 Americans were employed in the solar industry in 2019, double the number from 2012.

In December 2020, Congress passed an extension of the ITC (federal solar investment tax credit), which provides a 26% tax credit for systems installed in 2020-2022, and 22% for systems installed in 2023. The tax credit expires starting in 2024 unless Congress renews it. Homeowners will be able to take advantage of the solar tax credit well into 2022, and may even rush to do so, creating higher than anticipated demand in 2022.

Declining prices for solar panels and batteries will continue, attracting new buyers. Over 96 percent of net new energy generation capacity in 2022 will come from solar and wind sources, according to Deloitte. Solar construction costs fell by 37 percent from 2013 to 2017, and analysts predict that the costs of constructing solar power technology will continue to decrease at an average rate of 4.4% each year.

The selection of products powered by solar will expand in 2022. "Solar-powered equipment will be the buzzword in the world," says Solar Power Nation. Generators, phone chargers, speakers, security lights, fans and lanterns can all utilize solar power energy. Outlet-free outdoor equipment will grow as a sector, and create opportunities for solar companies. These items will appeal to people searching for a green option, as well as people who face extreme weather events that create problems like blackouts.

All of the evidence points in the direction of the solar power industry continuing to grow in 2022. As the market matures, manufacturers will need to innovate even more, and fasteners and mounting solutions will be one of the primary drivers of small-scale innovation.

If you’re looking for a supplier of standard stainless steel fasteners for solar installations, mounting hardware for residential or commercial rooftop PV arrays, or even fall protection for solar installers, look no further than Mudge Fasteners. Contact us at (800) 634-0406 to learn how we can help your solar company get it right, right on time.

Kyle Domer
What the New Infrastructure Law Means for the Fastener Industry

On November 15th, President Joe Biden signed his $1.2 trillion infrastructure bill. With bipartisan support, the legislation invests in funding for roads and bridges, rail, transit, ports, airports, the electric grid, water systems and expanded broadband. Eric Hoplin, National Association of Wholesaler-Distributors (NAW) CEO, stated that “this legislation will help the wholesale distribution industry more efficiently move goods and materials across the country, benefitting both American businesses and consumers. Bipartisan collaboration results in great achievements for our country, and this investment in infrastructure is a victory for all Americans.” So, the question for our industry now is “What does this historic legislation mean for the fastener world?”

Updating and upgrading US infrastructure as the economy recoveries will create opportunities in many sectors, which would lead to a higher demand for fasteners and all materials. Building new physical infrastructure will require various steel products, cement, lumber, and other material inputs. Modernizing federal equipment includes buying new vehicles. The bill includes a total of $40 billion of new funding for bridge repair, replacement, and rehabilitation, which is the single largest dedicated bridge investment since the construction of the interstate highway system. The deal’s $65 billion investment ensures every American has access to reliable high-speed internet with an historic investment in broadband infrastructure deployment. The bill sets aside $7.5 billion to help build a national network of electric vehicle charging stations. Biden's ultimate goal is to have a nationwide network of 500,000 EV chargers.

The American Iron and Steel Institute (AISI) estimates that for every $100 billion of new investment in infrastructure it could increase demand for domestic steel by as much as 5 million st. The Steel Manufacturers Association shared a similar estimate, stating that every $100 billion of investment can incrementally increase steel demand by 4 million st to 6 million st. Passage of the bill provides a "tremendous boost" to the US steel industry, Kevin Dempsey, CEO of the American Iron and Steel Association, said in a statement.

Abigail Ross Hopper, president and CEO of the Solar Energy Industries Association (SEIA), said, "Solar is a job-creator, and the long-term tax incentives for solar, storage and domestic manufacturing will put us on a path to decarbonize the electric grid, reach the President’s 2035 clean energy target, and create hundreds of thousands of quality career opportunities in every community."

As you can see, most of these initiatives will require significant use of fasteners of some type. Due to its federal funding, the fasteners used in these projects will likely need to be made in the USA, and some will need to be mil-spec fasteners. If you’d like assistance sourcing domestically manufactured or mil-spec fasteners, contact Mudge Fasteners at (800) 634-0406 for help.

Kyle Domer
The Most Common Types of Solar Fasteners

Mudge Fasteners is pleased to offer all of the most common solar fasteners for PV installations. What you see here is just a small selection of the most popular stainless steel solar fasteners. In fact, we stock 60,000+ different types of solar fasteners in our warehouse!

Kyle Domer
The King of Solar Fasteners: The Lag Bolt
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One of the most common fasteners used in solar installation is the 5/16 x 3-1/2” (18-8) stainless steel lag bolt, sometimes referred to as a lag screw. These fasteners were created to connect larger pieces of lumber together, but solar installations often require lag bolts to secure roof mounted systems directly onto the roof’s structure.

Solar racking manufacturers place the responsibility onto the installer to ensure there is enough “pullout strength” and shear “capacities” for the lag screws being used. The type of wood that solar racking is being attached to will affect the performance of a lag screw. A pilot hole needs to be pre-drilled for proper installation, and the drill bit used for the pilot hole should be undersized to allow the lag bolt to bind to the material during installation.

While there is no standard definition for the mechanical components of lag screws, guides for design and commonly used dimensions can be found in the American Wood Council’s ANSI/AF&PA NDS-2005 National Design Specifications (NDS) for Wood Construction. The most common variation occurring in lag screws is that of the shank length.

Lag bolts are ideal for heavy duty applications when a high level of stability is required. If you have any questions about using lag screws in solar installations, contact us for help. You can also buy lag bolts directly online at FastenerExpert.us.

 

Lag bolt pilot hole diameters. Click here to download (PDF).

Lag bolt pull-out capacities. Click here to download (PDF).

 
Kyle Domer
Common Coatings for Solar Fasteners
Black oxide hex bolts

Black oxide hex bolts

Different coating chemistries have long been used by fastener manufacturers to improve corrosion resistance, lubricity, or both. Understanding a solar fastener’s coating can ensure joint integrity, improve field life, and increase serviceability. 

Black oxide is a conversion coating used on fasteners made from ferrous (iron-containing) materials, copper and copper based alloys, stainless steel, zinc and more.Black oxide is sometimes used for appearance, to minimize the reflection of light, or for mild corrosion resistance. For black oxide to achieve maximum corrosion resistance properties, it must be impregnated with wax or oil. One advantage black oxide has over other coatings is its minimal buildup. Solar assemblies commonly use black oxide to coat a stainless steel fasteners for aesthetic purposes, creating an evenly colored black finish without compromising the integrity of the fastener. 

Inorganic coatings encompass anodizing, surface conversion, enameling, metallic coatings and more. Created through a chemical action that changes the surface layer of the metal into a metallic oxide film or compound, inorganic coatings are primarily used to reduce corrosion.

DURA-CON salt spray test results

DURA-CON salt spray test results

In addition to the previously mentioned unbranded coatings, the Magni organization offers a selection of proprietary coatings for solar fasteners. The 565 coating from Magni allows lubricants to be integrated into the topcoat, which will typically eliminate the need for messy and cumbersome post-treatments. This non-electrolytically applied, zinc-and-aluminum-rich coating also eliminates the concern of hydrogen embrittlement. Able to be formulated in many colors, the Magni 565 coating also comes in several friction levels while still providing consistency across different bearing surfaces.

DURA-CON brand fasteners offer a variety of Grade 5 and standard steel fasteners that are coated to be suitable for use as solar fasteners. DURA-CON fasteners employ a three layer coating system consisting of an inorganic zinc-rich first coat and an aluminum-rich organic second coat. Friction modifiers are integrated into the topcoat, resulting in repeatable torque tension characteristics during assembly. Grade 5 bolts are stronger than A307 zinc, hot dip galvanized or 300 series stainless steel bolts, and DURA-CON coating provides superior corrosion resistance; easily withstanding 1500 hours of Salt Spray per ASTM B-117 with no corrosion whatsoever.

For more information about which coating type my be best for your solar fastener application, contact us today.

Kyle Domer
Common Materials Used in Solar Fasteners

Though a particular solar application may call for a specific, less-common material, the majority of solar installation hardware is made up of one or a combination of four standard materials: 18/8 stainless steel, 316 grade stainless steel, 410 grade stainless steel, or Grade 5 steel.

Stainless Steel 18/8
The most widely used and flexible austenitic form of stainless steel, 18/8 stainless steel is 304 grade stainless steel. The numbers 18/8 are a representation of what makes up the material; 18% chromium and 8% nickel. This chemical makeup creates a material that is very resistant to both oxidation and corrosion. 18/8 stainless steel is common for sheet metal screws and most nuts used in solar installations.

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Stainless Steel 316
Known for its 2-3% molybdenum content, 316 grade stainless steel is an austenitic form of stainless steel. The additional molybdenum creates a metal that is more resistant to pitting and corrosion, and it also improves resistance to failure caused by very high temperatures. Particularly effective when used in acidic environments, corrosion that is caused by acetic, hydrochloric and other forms of acids can be prevented by using fasteners made from 316 stainless, but the metal is softer than 18/8 stainless or 410 stainless.

Stainless Steel 410
Containing 11.5% chromium, 410 grade stainless steel is general-purpose martensitic stainless, providing reliable corrosion resistance in most cases. Additionally, the corrosion resistance of 410 grade stainless can be further enhanced by processes like tempering, hardening and polishing. Fasteners made from 410 stainless are generally used for applications involving the need for mild corrosion resistance, high heat resistance and high strength performance. Self-drilling screws used in solar applications are commonly made from 410 grade stainless steel.

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Grade 5 Steel
Grade 5 is a zinc-plated, medium carbon alloy steel that has been heat treated to increase its hardness. Bolts made from Grade 5 steel are identified by three evenly spaced hash marks on the bolt’s head, and sometimes a manufacturers mark or logo may also be included. During the manufacturing of Grade 5 cap screws, the screws are heated to strengthen the outside, creating a stronger outside than inside of the fastener. When Grade 5 steel is used in a solar application, it is typically coated in a very corrosion resistant finish.

Bi-Metal Fasteners
A bi-metal screw, as the name suggests, is a. screw comprised of two metal types. The point is typically made from a high carbon steel that has been heat treated, giving it the ability to self-drill. The body is then made from stainless steel so as to provide the resistance to corrosion. One example of a highly popular bi-metal fastener is the Elco Bi-Flex structural screw, which are self-drilling, self-tapping screws that provide the efficiency of drill screws combined with the corrosion resistance of 300 series stainless steel. Bi-Flex screws can be used in both steel and aluminum racking.

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If you want to know more about which material the fasteners for your particular solar assembly should be made of, contact Mudge Fasteners for assistance.

Kyle Domer
Bolted Connections in Solar Installations: Corrosion

For bolted connections in any outdoor environment, avoiding corrosion is going to be key to preserving the integrity of the assembly. This is of course true for fasteners used in solar installations, since they’re not only exclusively used in outdoor environments, but often in some with the harshest exposure to the elements.

Joints exposed to a corrosion attack suffer deterioration. Failure caused by corrosion should receive priority attention, but even small amounts of corrosion causing loss of material can result in loss of preload.

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To reduce the possibility of corrosion in bolted connections, consider the following:

  • Use corrosion resistant and compatible materials.

  • Basic factors affecting how a corrosion-resistant fastener should be chosen:

    • tensile strength

    • fatigue strength

    • position of the fastener and materials to be joined on the galvanic series scale

  • Basic factors affecting how a corrosion resistant protective coating for fasteners should be chosen:

    • Level of corrosion resistance

    • Limitations due to temperature

    • Base metal embrittlement

    • Any effect the coating may have on fatigue life

    • Any effect the coating may have on locking torque

    • Whether or not the coasting is compatible with adjacent material

    • If the coating will cause any dimensional changes

    • Thickness & distribution

    • Adhesion characteristics

  • Protect from environmental exposure

Want to learn more about preventing corrosion in bolted connections? Contact us for assistance.

Kyle Domer
Bolted Connections in Solar Installations: Fatigue

The third consideration for bolted connections in solar installations is the possibility of fatigue and its effects on the integrity of the assembly.

Dynamic and alternating service loads will cause a bolt to fracture at a load less than its static tensile strength. That Fatigue Strength is the maximum tensile load a material can support before fracturing prior to a given number of loading cycles. As load is reduced, the number of loading cycles that a bolt can endure increases until a level known as the Endurance Limit Δ is reached, at which a bolt will function with immunity against fatigue.

Here are some guidelines to preventing fatigue:

  • High preloads protect bolts against failure.

  • When the portion of the fluctuating service load is less than the bolt’s endurance limit, the fatigue life is essentially infinite.

If you’re looking for help preventing fatigue in bolted connections for your solar panel installation, contact Mudge to get the assistance you need.

Two fatigue cracks have developed. The central area is the last to fail. Examination of the threads confirmed the bolt was loose.

Two fatigue cracks have developed. The central area is the last to fail. Examination of the threads confirmed the bolt was loose.

Kyle Domer
Bolted Connections in Solar Installations: Vibration
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In addition to the threat of relaxation described previously, vibration is another way in which bolted connection in solar installations can be compromised.

In tightened fasteners, frictional resistance develops between the bolt and nut threads and between the bolt head and the nut against the joined material. If this resistance is reduced, even for a microsecond, tensile stress in the bolt will cause the mating threads to loosen. Locking mechanisms can be employed to resist loosening.

To prevent loosening caused by vibration, consider taking the following steps:

  • The best way to clamp the joined material sufficiently that the frictional resistance exceeds any applied shear force that will occur in service. Properly preload the bolt.

  • Adjusting joint geometry to provide a mechanical restraint.

  • Use jam nuts, slotted nuts with a cotter pin.

  • Use anaerobic adhesives to cement threads together.

  • Use self-locking fasteners such as locknuts, nylon thread patches or pellets, or wedge-lock type washers.

If you have any questions about how to prevent loosening due to vibration in a solar fastener connection, don’t hesitate to contact us for additional help.

Kyle Domer
Bolted Connections in Solar Installations: Relaxation

When considering bolted joints in solar installations, there are a few factors that may influence the connection’s integrity, one of which is relaxation.

All joints experience some relaxation after assembly with an accompanying loss of preload. Additional relaxation may occur during the service life of the joint depending on time, loading type and level, and environment. If a joint relaxes too much, loss of preload may result in joint separation and failure.

In order to combat relaxation of a bolted assembly in a solar installation, take the following precautions:

  • Limit joint interfaces.

  • Ensure smooth surfaces.

  • Control parallelism of joint surfaces.

  • Use flange head bolts and flange nuts to reduce bearing stresses against joint material.

  • Use hardened washers under bolt head and nut to distribute bearing stresses.

  • Use smaller diameter higher strength bolt to increase elasticity.

If you have questions about how to minimize the threat of relaxation in bolted joints, please contact us.

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Kyle Domer
Solar Fasteners... What are they?
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The term “solar fasteners” is used to describe any fasteners used to install a solar power system. Typically, solar fasteners are standard parts that are used in other industries besides solar. Sometimes a solar company will design a custom fastener specific to their system. Different types of fasteners may be required depending on the method of installation.

To start; a fastener is a piece of hardware that affixes two or more objects together. Solar power design uses two broad categories of fasteners: mobile fasteners and permanent fasteners.

Mobile fasteners are bolts, nuts, washers, and some screws. Those fasteners are designed to create a temporary union between two objects. This temporary union means you can remove these fasteners without causing damage to the assembly. Rivets, welds, lockbolts and some screws are considered permanent fasteners, designed to create a permanent assembly between two objects. This means that if you remove one of these fasteners, you’ll cause damage to the union. The correct fastener will be dictated by the design of the solar system.

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Extreme environmental conditions are frequently present at the location of a solar power installations. Solar fasteners need to be durable enough to maintain the structural integrity of a PV (photovoltaic) system. Choosing the right fastener, in right material, with the right coating, will help ensure the longevity of the joint.

Kyle Domer
Washer Wisdom: Common Finishes for Washers

Washers can be plated or finished with a variety of coatings, ranging from the highly corrosion resistant DURA-CON coating to more simplistic metallic or painted finishes. Washers are sometimes coated for functional purposes, and sometimes for purely aesthetic reasons. Whatever the reason for using a particular coating or finish on a washer, we’re here to help to understand which would be best for your application. Let’s start with the three most common finished applied to washers.

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Zinc / Trivalent Zinc

The most popular commercial platings, zinc is both economical and corrosion resistant, commonly used in environments where excessive moisture will not be present. On top of the zinc, a clear chromate finish is applied to create an additional layer of protection against white oxidation spots that can form in the presence of moisture. The most common way of applying zinc coatings to fasteners is through electroplating.

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Black Oxide

Black oxide is a "conversion coating", meaning it is formed by a chemical reaction with the metal to form an integral surface, as opposed to an "applied coating" like zinc which bonds to the metal. A post-coating oil finish is typically applied to inhibit the development of rust.

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Galvanized

Hot dip galvanizing can be highly effective as a method to apply a sufficient thickness of zinc for corrosion protection in particularly harsh environments. Steel reacts with molten zinc during the galvanizing process, which forms layers of zinc-iron alloy that are bonded metallurgically with the steel surface. The hard barrier created during this process not only resists mechanical damage, but also has a very low rate of corrosion.

If you have further questions about finishes for washers, please don’t hesitate to contact us for more information.

Kyle Domer
Washer Wisdom: Other Specialty Washers

Certain applications require specialty washers that don’t necessarily fit into one of the earlier specified categories of flat washers, spring washers, lock washers and structural washers. Here we will look at three of the most common specialty washers used in industrial applications.

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Tab Washers

Tab washers are a less common type of lock washer, featuring a tab that can be bent up against the flat of a bolt head or hex nut, thereby preventing rotation of both the washer and bolt or nut. The tabs on these types of washers can be internal or external, can have one tab or multiple tabs, and can be manufactured in large outer diameters of up to 12 inches.

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Slotted Washers (C Washers)

Slotted washers feature a slot in the side that creates the appearance of the letter C and allows the user to install and remove the washer without completely disassembling the joint. Slotted washers can be used in a variety of ways, but are often used as shims or as a way to increase productivity in the process of repositioning an assembly.

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Finishing Washers (Countersunk Washers)

Finishing washers, also known as countersunk washers, are used primarily for decorative appearance. A countersunk screw can be recessed into the finishing washer to create a flush, flat surface, therefore also creating a very clean appearance.

If you have further questions about specialty washers, please don’t hesitate to contact us for more information.

Kyle Domer
Washer Wisdom: Structural Washers

The term structural washer is generally inclusive of washers used in an assembly with structural bolts, or any assembly that is integrative to the structural integrity of an engineered joint.

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Load Indicating Washers (Direct Tension Indicator Washers - DTI)

Load indicating washers were developed in the 1960s and contain raised protrusions that collapse as an assembly is tightened. To develop the correct tension, these washers should be used when installing A325 or A490 structural bolts. Both of the most common load indicating washer, standard DTIs and Squirter™ DTIs, are made to meet the specifications of ASTM F959.

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Square Washers

Square washers look exactly as they, shaped like a square to fit into channels and slots. The flat sides prevent the washers from rotating in an assembly, and are thicker and wider than common round washers, helping to distribute heavy loads more evenly.

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Cross Bracing Washers (Hillside Washers)

Cross bracing washers, also known as hillside washers, are used when connecting structural beams to cross-bracing rods or cables. These washers feature a curved top surface that allows rods to pass through and a nut to be secured at different angles, while the flat bottom side sits flush against structural beams. Cross bracing washers also contain a locking tab that make them stay in place when force is applied.

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Malleable Washers

Malleable washers are cast iron round washers most commonly used in wood dock construction. The large bearing surface of these oversized washers prevents nuts and bolt heads from pulling into their wood substrate.

If you have further questions about structural washers, please don’t hesitate to contact us for more information.

Kyle Domer
Washer Wisdom: Spring Washers

Spring washers have flexibility that is utilized to prevent loosening during vibration. They are “sprung” in order to maintain a consistent preload on the adjacent fastener as the joint experiences movement.

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Split Lock Washers (Helical Washers)

Split lock washers, or helical washers, looks like a ring with uneven ends. When tightened, these ends flatten to add tension to an assembly, thereby preventing the joint from loosening as a result of vibration. Split lock washers are used in a wide array of applications, but if your application is likely to experience extreme vibration, it might be better to consider a wedge washer or other type of lock washer.

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Conical Washers (Dish Spring Washers)

Known by many different names, including conical spring washers, cupped spring washers, Belleville washers and more, conical washers create a very compact spring due to their shell-like shape. Conical washers are unique in their ability to be stacked, either in the same direction to create increased spring stiffness, or in the opposite direction to create increased range of motion.

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Wave Washers

Wave washers have been pressed to create a wavy pattern, which acts as a spring when compressed with a threaded fastener. Due to their relative lightness, wave washers produce low preload forces.

If you have further questions about spring washers, please don’t hesitate to contact us for more information.

Kyle Domer
Washer Wisdom: Lock Washers

Apart from the variety of standard flat washers covered in our last article, the next most common type of washers are lock washers. Lock washers contain mechanisms that prevent bolts and nuts from loosening in the face of torque and vibration, thereby creating their namesake “lock” on the assembly.

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Internal Tooth Lock Washers

Internal tooth lock washers feature a series of “teeth” extending inward that “bite” into the bearing surface. The teeth help prevent a bolt head or nut from loosening, but also aid in absorbing shock and vibration.

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External Tooth Lock Washers (Star Washers)

External tooth lock washers, sometimes known as star washers, feature teeth on the outside of the washer ring that bite into the bolt or screw head. For these washers to work properly, they should be used with screws and bolts that have larger diameter heads, such as pan head and button head fasteners.

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Internal / External Tooth Lock Washers

These types of washers are exactly what they sound like, a combination of internal teeth and external teeth, and are often used in electrical bonding. Internal / external tooth lock washers are helpful when trying to span elongated holes, but can also be used between adjustable pieces of an assembly to help maintain the position of the components after the original tightening.

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Wedge Washers

Wedge washers, or beveled washers, have serrations on one bearing face and are used in a pairing. The serrated face of each washer is paired against the serrated face of the other in the pair, causing them to indent into the nut and stopping the possibility of rotation. Wedge lock washers are commonly used in construction equipment, railroad, automotive, solar and wind power applications.

If you have further questions about lock washers, please don’t hesitate to contact us for more information.

Kyle Domer
Washer Wisdom: Flat Washers

For the next installment of our Everything but the Bolt educational series, we’ll be digging into the various types of washers available for industrial uses. Some applications will only require a basic flat washer, while some applications will require a very specific type of washer, either for functionality or to adhere to certain code requirements.

The most common type of washer is a basic round flat washer, also known as a plain washer. Flat washers used in conjunction with bolts provide a smoother bearing surface on the underside of the bolt head or nut.

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USS Flat Washers

USS flat washers were developed as a standard (the USS is the abbreviation for United States Standard) for basic engineering requirements in most industrial applications. The specifications of Outer Diameter (OD), Inner Diameter(ID) and Thickness (Th) are made to appeal to the widest use and highest stability, allowing users to create extreme tightness at the joint in which they are being used.

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SAE Flat Washers

SAE flat washer specifications were developed specifically by the Society of Automotive Engineers to meet automotive manufacturing requirements in a broad sense. They typically have smaller outer diameters and less thickness than their USS counterparts. Although SAE washers are mostly used in automotive applications, they are also recommended for use any time the assembly includes Grade 5 or Grade 8 hex cap screws.

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Fender Washers

Fender washers offer an outside diameter, and therefore bearing surface, that is much larger than that of USS flat washers. The large outside diameter design helps to better distribute applied forces when tightening an assembly. Fender washers are most commonly used in sheet metal, plumbing, automotive and electrical applications.

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Thru Hardened Washers

Thru hardened washers provide additional strength and protection by going through a process of hardening or carburizing. While typically of a smaller size than standard USS washers, hardened washers are recommend for us with Grade 8 bolts, as well as other heat-treated fasteners.

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ANSI Washers

ANSI washers are flat washers that meet standard provided by the American National Standards Institute (ANSI). Type A washers take into consideration both narrow and wide sizes, while Type B washers come in narrow, regular and wide sizes. Though the difference between the two types can be very minimal, the precise sizing can come in handy for applications where the washer dimensions are critical to an assembly’s functionality.

If you have further questions about flat washers or plain washers, please don’t hesitate to contact us for more information.

Kyle Domer
Know Your Nuts: Specialty Nuts

In our last installment of Know Your Nuts, we’re reviewing some of the less common but still very important specialty nuts available for niche uses. All specialty nuts have a particular use case in which they excel, whether they’re being used for security, to overcome an engineering hurdle, or for a specific industry. Below are examples of several specialty nuts that may be beneficial to you when designing your fastened connections.

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Coupling Nuts

Coupling nuts are threaded fasteners for joining two male threads together, such as threaded rods, pipes and other parts, including those with different sized parts. Coupling nuts can also be used to extend rod assemblies to longer length from shorter components. When a right hand/left hand coupling nut is required, the part needed is known as a sleeve nut.

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Cage Nuts

Cage nuts typically consist of a square nut encased in a spring steel cage with wings that can be used to compress and release the nuts. Also known as captive nuts or clip nuts, the most common use of cage nuts is in different types of equipment racks and mounting rails.

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Castle Nuts

Castle nuts, or castellated nuts, have grooved heads that align with holes in a mated bolt, allowing a cotter pin to be inserted and therefore locking the nut in place. Installed like a traditional hex nut, the castle nut is commonly used in low torque applications as a simple to use, low-cost means of protection against loosening caused by vibration.

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Weld Nuts

Weld nuts are a type of specialized nut engineered specifically for the purpose of being welded to another metal component. Weld nuts are helpful when a very high strength connection is needed in an application with limited space. Weld nuts come in a variety of shapes, including square, round, tabbed and flange. Since weld nuts need to be welded, they usually come uncoated, to be painted or finished later after the welding is completed.

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Wheel Nuts

A wheel nut, more commonly known as a lug nut, serves the specific purpose of securing a wheel to a vehicle. Automobiles, trucks, and other large vehicles with rubber tires are the most typical applications for wheel nuts.

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Rivet Nuts

Rivet nuts, also known as blind rivet nuts or rivnuts, are one-piece internally threaded and counterbored tubular rivets. Rivet nuts are a type of threaded inserts, and can be anchored entirely from one side. One form of rivets nuts are designed to bulge on the back side as a fastener is tightened, locking the assembly into place. Rivet nuts are most commonly used in applications where the substrate is too brittle or thin for regular hole tapping, especially in tubing for electronics, aerospace and more.

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Self-Clinching Nuts

Self-clinching nuts, also called swage nuts, provide a great solution for design engineers when a strong reusable thread is needed for their application. Self-clinching nuts can fasten softer materials permanently by anchoring into the material, and are often used in sheet metal and cable railing assemblies.

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Tri-Groove Nuts

Tri-Groove nuts belong to a family of specialty fasteners known as “security fasteners” or “tamper-proof fasteners” and are commonly used in public applications like parks, campgrounds and community centers. Tri-Groove nuts are installed using a unique socket designed to grip the indentations on the outer body of the nut, allowing it to be turned along the threads. It’s typical for these security fasteners to be used with driver-less fasteners, like carriage bolts and concrete anchors, ensuring a fully tamper-resistant assembly.

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Break Away Nuts

Break away nuts, or shear nuts, are another type of security fasteners used in assemblies where tampering could be a concern. These conical-shaped nuts feature a hexagonal gripping point, and are designed to allow the hex head to snap off, or “break away”, once the maximum torque is reached. What remains is a protective cone nut that is tamper-proof and extremely difficult to remove since nothing remains to be gripped.

If you have further questions about specialty nuts, please don’t hesitate to contact us for more information.

Kyle Domer