Quality Practices

3 Solutions for Nylon Insert Nut Challenges

Challenges with Nylon Insert Nuts

If you use nylon insert lock nuts in production, it is more than likely that you have run into some issues like the ones pictured below:

Nylon Insert Nut 1 Nylon Insert Nut 2 Nylon Insert Nut 3

Causes

Why does this happen, and usually only in January through March?

The inserts are made of 66 nylon which is hydroscopic, meaning it can absorb moisture up to 8% of its weight. When exposed to temperature extremes and low humidity, the nylon will lose moisture and can shrink slightly and in some cases become brittle. These conditions are not relevant once the insert is installed, but if the nylon has become too dry prior to assembly, then we can see problems like those pictured above.

Certain assembly conditions can contribute to failure of a dried out insert, such as:
• Poor or no chamfer on mating threads
• Long thread engagement
• High assembly speed
• Any combination of the above conditions

If the insert is very dry and brittle, and the mating thread has a poor chamfer, we can see breaking of the nylon, especially if the assembly speed is very fast as with an impact gun.

Long thread engagements coupled with high speeds seem to heat-up the dried out nylon enough to cause it to extrude out the top of the nut. This can happen with properly hydrated nylon as well, especially if the pitch diameter of the mating thread is at the upper end of tolerance (the nylon has to go someplace) but it seems to happen more when the nylon is dried out.

In extreme cases of dried out inserts, such as those run through a bake oven for some type of post finish (zinc flake for example), the inserts may spin freely in their cavity prior to installation. When the mating part is introduced, some inserts may be pushed out of the nut without even forming threads into the nylon ring.

Solutions

  1. Packaging/environment
  • Wherever possible, keep nuts sealed in their original containers until they are ready to be consumed.
  • Do not store more nuts than needed in extreme cold and/or dry environments.
  1. Assembly
  • Check for chamfers on mating parts – a smooth entry into the nylon will lessen potential problems.
  • Avoid long thread engagement if possible.
    • If not possible, adjust speed down to lessen heat build-up.
  • Check speed of assembly – try slowing down the speed if problems occur.
  1. Additional Insert Material
  • If these solutions do not resolve the issues, then consider another type of insert material.
  • High temperature materials are available that are not as sensitive to environment.

For questions, please contact our Engineering team at ProvenProductivity@Bossard.com.

Doug Jones
Applications Engineer
djones@bossard.com

June 22, 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 ProvenProductivity@bossard.com.

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 ProvenProductivity@Bossard.com to speak with one of our engineers.

February 09, 2018
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A Complete Guide to European Standards

Standardization in the fastener industry is a necessity. Without fastener standards, there would be inconsistency and inefficiency. Because of fastener standards, engineers and consumers alike know exactly what to expect.

Because of the consistency that comes along with standards, international business and trade becomes much easier. Companies can purchase products from around the world and can rest easy knowing that the product will fit in their application. There are many organizations that create fastener standards; one of these organizations is the European Committee for Standardization.

In 1991, the European Committee for Standardization, also known as CEN, began working on the standardization of the fastener industry intended to be applicable throughout Europe. International Organization for Standardization (ISO) standards are adopted as European (EN) standards wherever possible. However, new EN standards are established when the ISO standards are not deemed suitable.

German Institute for Standardization (DIN) standards are being replaced by EN or ISO standards. In the future, DIN standards will apply only to products for which no ISO or EN standard exists.

DIN EN ISO plus a number (e.g. DIN EN ISO 4027) would indicate that a combination of all three standards are acceptable.

DIN ISO plus a number (e.g. DIN ISO 7049) indicates an ISO standard that is an adopted unchanged DIN standard.

Standards can sometimes be confusing. If you have any questions about fastener standardization, let us know by reaching out to us at ProvenProductivity@bossard.com.

 

Joe Stephan
Application Engineering
jstephan@bossard.com

September 29, 2017
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Length of Engaged Thread

Length of Engaged Thread

Length of engagement is important to understand. The required minimum length of engagement changes for different materials and hardness of said materials. This is something that needs to be determined during the design process.

When screws need to be fully loaded in tensile, it is important to note the strength of the material that the ‘nut’, or female threaded component, is made of. The minimum length of the engaged thread will depend on it. Ultimately, it is important to achieve the required minimum length to give the joint the durability it needs.

Below are some examples of recommended minimum lengths of engaged thread in internal threads based on the material of the nut component for heat-treated steel bolts. These have been determined from practical trials:

Recommended minimum lengths of engaged thread in internal threads.

Make sure the toolbox of information needed to determine the proper length of engagement is readily available. Reach out to us at ProvenProductivity@bossard.com if there is any questions regarding this!

June 02, 2017
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Fatigue Resistance in Fasteners

Fatigue Resistance in Fasteners

Simply put, you want your fasteners to hold up under many situations including conditions of changing load. However, some fasteners cannot hold up to the challenge. One of the most common forms of fastener failure is fatigue. That is why fatigue resistance and strength is something to look for in your fasteners.

A fastener can experience fatigue for a variety of reasons including assembly parameters, fastener material, geometry, and stress on the fastener. Fatigue often occurs in the first load-bearing part of the thread, and it can be detrimental to your project. This means your design must allow for screws to increase its fatigue strength. However, the fatigue strength of fine threads decreases with increased rigidity and fineness of thread, so there are some things to keep in mind with fatigue strength in your fasteners.

There are ways to increase the fatigue strength of your screws. These would include measures that reduce the effective peak stresses or prevent combined loading.

Check out some options for increasing your fatigue strength:

  • Use longer screws rather than shorter screws
  • Use screws with waisted shanks
  • Use pins or fitted shoulder screws to absorb lateral forces
  • Adequate and controlled pre-stressing of the screws

Reach out to us at ProvenProductivity@bossard.com to learn more about fatigue resistance and to find the fastener with the perfect fatigue strength for you.

May 26, 2017
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Industry 4.0 and Smart Factory Logistics

smart factory methodology with Bossard

The purpose of a factory is to mass-produce goods. It allows for a company to make many products very quickly. Ultimately, the faster and better that companies can make products the more money they can make.

Factories have been around for a while, but now we are transitioning into something new—Smart Factories. “A new type of factory, so-called Smart Factories, are emerging worldwide. Manufacturers require flexible production lines and sites,” explains Urs Güttinger, Head of Smart Factory Logistics at Bossard. “Smart technologies enable this agile production at a fraction of the cost and time.”

At Bossard, we are on top of this new trend. We can help you make your factories smarter with our Smart Factory Logistics methodology. This methodology helps develop a leaner, faster and better process within your factories.

Bossard’s Smart Factory Logistics

  1. We provide a simple yet intelligent process – Smart Factory logistics is the complete system that manages your B- and C-parts. The proven methodology uncovers potential for improvement and it makes that potential a reality.
  2. We provide customized solutions – We have advanced technological systems like SmartBin and SmartLabel that provide real-time information about the parts you have and the parts you need. That way your factory is provided with exactly what you need, not what you might need.
  3. We provide transparency – Bossard has a supply chain collaboration software, ARIMS, that collects and processes the data from your specific factory. This software pulls together all the information you need from our systems like SmartBin and SmartLabel as well as other information you need to get the job done. This creates transparency between you and the customer as they can receive real-time information online.

If you are ready to step up and take your factory to the next level, contact us at ProvenProductivity@bossard.com. You can also find more information at the Bossard microsite www.smartfactorylogistics.com.


April 07, 2017
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Is it Safe to Reuse Screws?

reuse screws

For many of us, the default is to try to reuse materials from previous projects to save on costs and because we already have those materials around. However, is it safe to reuse screws?

Check out this video for some quick rules on when you should or should not reuse screws:

As the video said, do NOT reuse screws if

  • They have exceeded the yield point
  • They have wear and tear from external loads
  • They will be used in critical applications

You can reuse screws, but if you are worried about the integrity of the screw, it might be best to get new fasteners.

If you have a specific question about a project or situation, reach out to us and we can give you the benefit of our expertise. Contact us at ProvenProductivity@bossard.com with any questions or concerns about fastener reuse!


January 27, 2017
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A Closer Look at Austenitic Stainless Steel

austenitic stainless steel

Fastener Materials: A Closer Look at Austenitic Stainless Steel

When picking the fastener for your next project, you are going to want to consider the material it is made of. Many of our options include steel fasteners. The main options you have for steel are Low Carbon Steel, Medium Carbon Steel, Alloy Steel, Stainless Steel, or Austenitic Stainless Steel.

Stainless Steel
Stainless Steel is an alloy that combines carbon grades with chromium and nickel. To be Stainless Steel, the alloy must contain at least 10.5% chromium. Austenitic is a type of Stainless Steel. Let’s take a closer look at Austenitic Stainless Steel.

Austenitic Stainless Steel
Austenitic stainless steel has a chromium content between 15% and 20% and a nickel content between 5% and 19% and offers a higher degree of corrosion resistance than the other two types of stainless. The tensile strength of austenitic stainless steel varies between 72,000 psi and 115,000 psi (500 MPa to 800 MPa). 18-8 stainless steel is a type of austenitic stainless that contains approximately 18% chromium and 8% nickel. This group includes AISI grades 302, 303, 304, 304L, and 316.

Consider using Austenitic Stainless Steel in projects that need corrosion resistance or projects that involve exposure to high heat. Do you still have questions about fastener materials? Contact us at ProvenProductivity@bossard.com and we can set you up with the fastening solution that will fit just right.


December 23, 2016
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A Closer Look at Stainless Steel

stainless steel

Fastener Materials: A Closer Look at Stainless Steel

Should I use Stainless Steel for fastening in my next project? That’s a good question. Fasteners come in a variety of materials and it is important to consider your project before you decide what material to use for it.

Many fastening options involve steel. The main options you have for steel are Low Carbon Steel, Medium Carbon Steel, Alloy Steel, Stainless Steel, or Austenitic Stainless Steel. Let’s take a closer look at Stainless Steel.

Stainless Steel
Stainless steel is made up of alloy steels that contain a minimum of 10.5% chromium content. The presence of chromium creates an invisible surface film that resists oxidation and makes the metal corrosion resistant. If the surface is damaged, it rebuilds itself in the presence of oxygen. It is important to understand the self-healing process because stainless steel used in a low oxygen surrounding is susceptible to aggressive influences if the protective surface layer becomes damaged.

Stainless steel is divided into three classes: Austenitic, Martensitic and Ferritic.

Stainless Steel fasteners are a good option when you need a fastener with high corrosion resistance because these fasteners will not easily deteriorate. If you have questions about Stainless Steel fasteners or need help in deciding on a fastener, contact us at ProvenProductivity@bossard.com. Our experts can help you get the materials you need for a successful project.


December 16, 2016
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