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3 Types of Joint Studies

Joint Study

The purpose of a joint study is to understand the forces acting on the assembly during tightening. A joint study may be necessary if you have a critical joint or if you are having warranty claims that can be linked back to joint failure.  When is a joint considered critical? If the failure of the joint may cause injury or have a serious monetary impact, it should be considered critical.

Typical Types of Joint Studies

1.Torque Tension Analysis

This study is used to make sure that your prescribed torque is achieving your intended clamp load. Low clamp load may lead to loosening through embedment, rotational loosening and/or fatigue which all can result in failure of the joint. High clamp load may yield the fasteners or the mating joint components, lowering their clamping force which can also result in failure of the joint.

2.Drive & Strip Torque Analysis for Thread Forming Screws

Performance of thread forming screws in both metal and plastic are greatly dependent on the hole size and preparation. The correct hole size should offer a good balance between low drive torque and high strip torque which can be determined through testing. These types of joints aren’t often as sensitive to the amount of clamp load they retain, but choosing the proper hole size and assembly torque will greatly affect the joint’s performance.

3.Vibration Analysis

Joints subjected to vibrational forces may experience loosening and eventual failure if not designed properly. Different types of fasteners and locking features are often utilized to address vibrational loosening. Performing a vibration study helps to select the proper hardware for your specific situation.

To learn more about joint studies and to talk to an engineer about your project, contact us through


Doug Jones
Applications Engineer

April 13, 2018
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What’s the Difference Between Kits and Assemblies?

Kits & Assemblies

The difference between a kit and an assembly is quite simple:

  1. An assembly is taking two or more parts and combining them together to form one ultimate part.
  2. A kit is combining two or more components and either bagging or boxing them together. Typically, this gives the end user the ability to easily assemble the parts without confusion.

Kitting and assembling components is a task that typically involves multiple different items, and can take up a lot of time for both your employees and your company. Every item has its mate and place in different applications and if it isn’t done properly, it can potentially cause a butterfly effect. The result will be failures due to incorrect assembly, loss of production due to having to stop, and having to locate the proper part because it wasn’t kitted correctly.

Kits and assemblies need to be done right. It takes patience, attention to detail, and are extremely time consuming. If you feel you have a kit or assembly opportunity that you need assistance with, please contact Bossard at


Eric Barfels
Technical Sales

April 06, 2018
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Fine Threads vs. Coarse Threads: Which One is Right for Your Application?


Coarse threads have become the standard for most fastener applications, but when should fine threads be considered?

Fine Thread Strengths

Fine threads are technically stronger under static loading, because they have a larger minor diameter which translates into a larger cross-sectional area As. If using fine threads to increase strength, it is important to make sure that the mating thread – the nut or tapped hole – can support the additional load. This may require a thicker nut or more thread engagement in a tapped hole. Remember the cardinal rule that the nut member must always be stronger than the bolt!

Fatigue Resistance of Fine Threads

In joints with high cyclical loading, fatigue failure becomes a concern. Repeated cyclical stress can create cracks which typically occur in the first loaded thread of the joint. Studies have shown that fine threads increase the percentage of load on the first thread, which can lead to a shorter fatigue life. In this scenario, fine threads should not be a first choice.

Fine Thread Vibration Resistance

In the past, vibration resistance was thought to be a benefit of fine threads. The smaller helix angle, at least in theory, slows down the loosening process. A tradeoff of this benefit is the slower assembly time of fine threads; the smaller helix angle requires more angle of rotation to advance, slowing down the assembly process. A better solution to vibrational loosening can often be found in some sort of locking mechanism which can be recommended by your fastener source.

In conclusion, fine threads should not be used for load bearing joints unless there is a very specific reason and testing is done to validate the joint. Some exceptions could be hard to tap materials or thin wall materials. For non-load bearing joints that require adjustment, fine threads may be your best option.

For more help on choosing the proper fasteners for your project, contact us through


Doug Jones
Applications Engineer

March 30, 2018
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How To Improve Your BOM


What is one of the most asked questions we receive from a new potential customer? “How hard is it for me to get the right fastener in my bins?” There are a lot of things that go into making sure this process runs smoothly.

Good communication about what is needed for a quote is crucial. A good quote process begins with a Bill of Materials (BOM), the Estimated Average Usage (EAU), quality understanding, and an estimated deadline. The BOM should be clean and detailed with dimensions, head styles, drive styles, product types, materials, and finishes.

Every customer has their own way of abbreviating the information to a short description, so paying attention to the details is key. Some fasteners may also be used in a variety of applications. Understanding the business and having a grasp of the BOM will help make sure the right fastener is in the production line. As mentioned earlier, estimated usage, quality requirements, and a reasonable deadline will help with getting the most accurate quote back for review.

What will it take for you to win business, save the company money, and prevent line down situations when switching fastener vendors? Ordering AND receiving the correct parts the first time! Let the experts at Bossard help you review and translate the terminology of a sloppy BOM and get you the correct fastener the first time around. Contact us at for more information.


John Syharath
Technical Sales

March 23, 2018
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An Introduction to Hydrogen Embrittlement

Hydrogen Embrittlement

Hydrogen embrittlement is a permanent loss in ductility caused by introducing hydrogen into a metal fastener in combination with stress. A typical hydrogen embrittlement (HE) failure is a delayed failure and happens after assembly. An HE failure is caused when three requirements are fulfilled. These areas are (1) hydrogen induced, (2) stress applied, and (3) high hardness. Continue reading for more information about each area.

Hydrogen Induced

Hydrogen needs to be induced for an HE failure. This is most commonly induced in the electroplating process, but can also be introduced into the material through corrosion of the bolt.

Stress Applied

Once stress is applied to a bolt that has a significant amount of hydrogen trapped inside the molecular structure, it is a matter of time when the hydrogen collects in molecular void and that void will grow bigger until the fastener fails.

High Hardness

This is the easiest pillar of an HE failure to control in the HE failure spectrum. Industry standards dictate that anything 320 Vickers Hardness or higher needs stress relief and possible further special attention.

HE failures can be very dangerous because the failure is delayed after installation and is very sudden. Before a bolt with HE is installed, there is not a visual way to identify if HE is present.

Any fastener that meets the hardness criteria need special attention and care to avoid HE failures. Contact us at if you have any questions about HE and its causes.


Brandon Bouska
Application Engineer

March 16, 2018
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Quick Guide: Rotary Dampers

Rotary Dampers

Rotary dampers serve the purpose of providing smooth and controlled movement while opening and closing many different devices. These rotary dampers can be applied to a variety of machinery like computer docking stations, CD players, printers, home appliances and much, much more. Controlled opening and closing of a mechanism’s left, right and bilateral rotations provides a sense of great value as well.

A better-quality machine is possible with the use of rotary dampers. Not only will the instrument operate smoothly but also last longer thanks to the gentle effect the rotary damper can provide. It seems appropriate to install this type of technology to decrease vibration, noise and relieve standard mechanical wear on the operating machine.

These gears are made of ABS, PC and POM materials. Because of the materials’ durability, the flammability ratings on the rotary dampers are as follows: PC: 92V-2; POM: 94HB; ABS: 94HB. It’s also worth noting that the temperature tolerance ranges from 32°F (0°C) – 122°F (50°C). Stats like these can help implementation of the rotary damper be applied to a majority of mechanisms that desire a lengthier and healthier existence.

If you would like to know more about rotary dampers and how they can be used in your application, email us at

March 09, 2018
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Should I Use Weld Nuts, Self-Clinching Nuts, or Blind Rivet Nuts?

assorted nuts & screws

The use of captive nuts is a great design opportunity for a variety of applications. These differing styles of nuts are captive because once installed, they become an integrated part of the assembly. Examples of captive nuts are weld nuts, self-clinching nuts and riveting nuts. For more information on the specific designs consider the technology of each one.

Weld Nuts

Weld nuts are welded to another piece of metal. These can be used instead of sheet metal screws in thin sheet metal applications. Weld nuts come in different sizes and shapes and require equipment to install. These types of nuts form the strongest bonds. They are not plated for corrosion protection as this would hinder the welding process; a subsequent plating process or painting would be required to protect the assembly from corrosion after welding is complete.

Weld Nut

Self-Clinching Nuts (swage nuts or insert nuts)

Self-clinching nuts are clinched or pressed into soft sheet metal. They come with several types of plating options and can be heat treated to provide more thread strength unlike its counterparts. Self-clinching nuts also require equipment to install.

Slef-Clinching Nut

Riveting Nuts (blind rivet nuts)

Riveting nuts are the quickest to install. The necessary tools to implement this nut design are also relatively less expensive. They are installed much like a blind rivet and can be fixed into blind holes unlike self-clinching nuts or weld nuts.

Riveting Nut

Captive Nuts Comparison Chart

Type Application Advantages Disadvantages Special Tool Required
Quick installation Inexpensive piece price Different plating options Different strength options Other Need access to both sides No plating options  Precise pre-drilling required Need special tooling to install Other
Weld Nut General X Strongest bond  X X X Yes → Welding machine $$
Sheet metal
Self-Clinching Nut Sheet metal X X X Strongest threads X X X Yes → Press $$$
Circuit boards
Blind Rivet Nut Sheet metal X X X X X Grip range limited Yes → Pneumatic tool $
Laminated materials

**Advantages and disadvantages are accurate for most catalog offerings of these nuts, exceptions may apply


Picking the right captive nut for your design can be difficult. Luckily, Bossard has an engineering team with decades of experience, ready to help you. Contact us at for more information.

Fadi Saliby
Technical Sales Director

March 02, 2018
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How to Use Lighting Industry Fasteners the Right Way

Lighting Industry Fasteners

The lighting industry benefits from modern advancements in the smallest details of engineered lighting components. Rivets and fasteners, as well as wire management products, help everyone with their lighting needs. Whether the requests are for residential electrical jobs or those industrial and institutional lighting projects, the industry is thriving with several options for each scenario.

Rivets and fasteners are a few components that offer creative solutions to many lighting necessities. Drive fasteners, mounting buttons, fastener plugs and push-in fasteners are all a part of successful lighting installations. They can ensure a successful installment of light fixtures with convenience in mind.

Wire management is another concept to be appreciated when stringing it all together. Cable clamps will be a beneficial factor in keeping wires and cables neat and organized. A variety of clips and clamps exist in the markets today that are customized for those very specific jobs at hand.

The lighting industry has come a long way in making the little things matter more. The technological benefits and enhanced features that have been implemented in the smaller aspects of lighting are making more lighting preferences possible.

Reach out to us at to see how Bossard can help you with your lighting fastener needs.

February 23, 2018
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Joining CFRP: Attachment Methods for bigHead® Fasteners

bigHead® Fasteners

Choosing the right method of attachment for bigHead® fasteners can literally make or break your application. With innovations in materials and processes daily, in a continuously growing industry, choosing the right technique is imperative. It all comes down to details.

When it comes to Carbon Fiber Reinforced Polymer (CFRP) and attaching fasteners there are a few methods to consider. Today, traditional adhesive bonding methods are still effectively used in many production environments.  However, we have new techniques currently in development which include lean bonding and pre-form mechanical fixing prior to molding.

The lean bonding solution utilizes a pre-applied dry film adhesive, induction heating and pressure to reduce bonding time dramatically. Bonding times well under a minute can be expected. As an alternative to the adhesive bonding methods, bigHead® fasteners can be attached to CFRP by stitching, tufting, over-laminating or clinching into the pre-formed material.

For a more practical application, outlined below are techniques for attaching fasteners into dry fiber pre-forms:

  • Over-laminated: Either with ply-drops/localized or overlay holes to accommodate for stud
  • Stitching/tufting: Fastener retained in place by stitching into pre-form
  • Pocket stitched: Like over-laminated, but with stitching around the fastener to secure inside “pocket”
  • Pre-coupled patch: Fiber patch pre-applied to fastener and incorporated into molding (can be attached by adhesive or stitching/tufting)
  • Clinched: Fastener with spiked protrusions that embed into the pre-form

If you have any questions about bigHead® fastener attachment techniques into preformed CFRP please contact us through

February 16, 2018
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7 Types of Cable Clamps

Cable Clamps

Organizing cables can be a nightmare if it’s not done right the first time. Cable clamps help ensure the work being done is kept neat and clean by providing an assortment of options based on the cable that is being installed. Clamps range from self-aligning, hinged locking, compression, stainless steel, steel cushion and vinyl coated. With several options readily available, it’s best to customize the clamp to the type of cable being implemented and the environment that the cable is being installed in.

Self-Aligning Clamps

Self-aligning clamps are designed with rounded edges to reduce the hazard of chafed cables. The style of the self-aligning clamp also safeguards the cables with the interlocking technology that mounts and secures the line so that it cannot separate from the brace.

Hinged Locking Clamps

Hinged locking clamps have a hinged design that locks in place while providing tension relief from the wires. These unique brackets also reduce vibration as they hold the cables securely in place.

Compression Cable Clamps

Compression cable clamps also operate on a hinge. Unlike the hinged locking clamps, the compression braces allow for the addition and removal of cables over time. These could be useful when implementation of future cables is expected.

Steel Cable Stays

Steel cable stays offer a quick and simple way to secure cables. These steel cable stays have an adhesive back support that offers a secure grip for cable installation.

Stainless Steel Cable Clamps

Stainless steel cable clamps were designed to tolerate tougher environments. Their corrosion resistant construction and thoughtfully stamped edges ensure a secure hold for cables. The style, much like the self-aligning clamps, also protects wires from deteriorating from friction.

Steel Cushion Clamps

Steel cushion clamps have an EPDM cushion that lines the inner workings of the clamp. This rubber lining absorbs vibrations and provides insulation for electrical wiring. These braces also resist erosion as part of its zinc electroplated make-up.

Vinyl Coated Clamps

Vinyl coated clamps offer more flexibility. There are two types: the steel clamp and the steel spring clamp. They both offer a grip and insulation through the vinyl construction. The softer steel offers the ability to manipulate the shape based on the wires that are being installed. It’s also worth noting that the spring clamps may show more favor to ribbon cables while still supporting rounded cables too. While these clamps fasten to the wall, their flexibility allows them to remain fastened as adjustments are made to the actual hold of the cables.

Not sure which cable clamp is best for your application? Contact us at to speak with one of our engineers.

February 09, 2018
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