Category Archives: Engineered Polymer Fasteners

Q: We are looking to find an electrically   non-conductive bolt that would also work at temperatures up to 500 F max. They will be used for an electrically live part isolation kit. Anything that will fit the bill? A: Without any understanding of your strength requirements, and focusing solely on the … Continue reading

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Q: I need a flat head screw that is both non-Conductive Fastener and can survive shock and vibration. Any ideas? A: Polymers and ceramics are the only options for non-conductive screws. As ceramics are brittle, they would non withstand shock and vibration. In terms of polymers, PEEK is the go-to option … Continue reading

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Q: We are looking for screws to hold down electronic circuit boards. Unfortunately the mounting provisions need to be electrically isolated from the mounts. In addition,  we need strength, non-conductivity, and impact resistance, even at cold temperatures (-40C). A:  A great material to consider would be PEEK screws or PEEK with Glass Fiber reinforcement.  These … Continue reading

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Q: Can you make a 100 deg flat head, with a hex socket driver? A: Yes this screw can be produced but there are some significant trade-offs that need to be realized. Though a hex socket driver is a typical driver in an 82 deg flat head screw, in this instance for … Continue reading

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Q: I’m involved in is currently looking at your non-conductive fasteners to isolate an SMA Connector. But have several questions for finding the right solution regarding torque, preload heating and cooling, and locking features. A: Thanks for all the questions and interest. I will answer all your questions: How is torque … Continue reading

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A&B Thread Pitch Q: What is the difference between an A and B thread pitch? A: An A Thread class or pitch signifies the outer threads, therefore an A applies to a bolts, screws, threaded rod and studs. Whereas a B thread class applies to the internal threading. B Thread … Continue reading

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Standard Angle for Inch Flat Head Screws Q: What is the standard angle for an inch flat head screw? A: Flat head screws made in inch dimensions typically have a standard angle of 82°. This holds true per ASME 18.3 for flat head socket cap screws which are the most common.However ASME B18.6.3 … Continue reading

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Q: What is the standard angle of a metric flat head screw? A: Metric flat head screws have a standard angle of 90 degrees. This is stated in the metric DIN standard DIN963 for flat head phillips and slotted flat head screws. Also, the standard angle for metric flat head socket … Continue reading

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Q: What is the difference between UNC and UNRC Threads? A: An “R” pitch can apply to UNRF (unified rounded fine thread) and UNRC (unified rounded coarse thread). The only difference between UNC threads and UNRC threads (or UNF and UNRF threads) is that the root of the thread – … Continue reading

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Q: I need a non-conductive screw. Can I use Carbon fiber reinforced PEEK? A: NO – The addition of carbon fibers into the polymer will significantly increase the conductivity of the material.

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Q: How do I know if a material is magnetic? A: Iron is the element that causes magnetism.  Therefore, any material/alloy containing iron MAY be magnetic to some extent. However while all stainless steels contain iron, some stainless steels are magnetic, and others are not. The defining factor of magnetism … Continue reading

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What is a Jam Nut Q: Can you tell me what the difference is between a standard hex nut and a jam nut? A: A jam nut has a shorter height than a standard finished hex nut. Typically, it is half as tall as a standard hex nut. A jam … Continue reading

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Q:What is included in a fastener certificate of conformance? A: A Certificate of Conformance for fasteners – often called a CoC – focus on the part dimensions, additional processing and compliance certificates.  It confirms the dimensions of the part and states that these fasteners meet any of the customers requested industry standards such … Continue reading

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Q: My customer is asking for bolts with EN 10204 3.1 and 3.2. I have no idea what that means can you help me out? QA: EN 10204 3.1 and 3.2, as well as 2.1 all are European standards for quality certificates. The number 3.1 identifies that they require a … Continue reading

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Sulfuric Acid ( H2SO4 ) is one of the most widely used and important acids, being an essential component to many industries. Equally as important is selecting the right material to survive this environment. This newsletter will provide options. WHICH IS BEST? That depends on BOTH concentration and temperature – … Continue reading

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Q: Am I right in understanding that polymer fasteners are  chemically resistant? I know they are not nearly as strong or temperature resistant as a metal, but our temperatures are ambient so would this work for me? A: For HCl, you would want to consider PVDF polymer fasteners.  These are … Continue reading

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Polymers at Cryogenic Temperatures Most often people want to know how hot a material can be used up to in an application, however for cryogenic applications, in media like liquified gasses (nitrogen, oxygen, carbon dioxide, LNG, etc.), we need to understand how materials perform at very cold temperatures.  Polymer fasteners … Continue reading

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Q: Which polymer do we offer that would have the smallest compressibility and minimal thermal expansion? We have a very precise laser application. So if the screw changes its dimensions with increasing / decreasing temperatures or loads their device may not be as accurate as it should be. Can you … Continue reading

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Q: I’m designing a process that must be able to handle a high load at about 1000F. I’m planning to use A286, but I now need to know what bolt length size to use to make this machinery stable. I’d like to use as short small of a bolt as possible so how … Continue reading

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Q: We require materials with low outgassing (conforming to ASTM-E595) for use in a satellite and I have yet to find a polymer screw that could meet these requirements. Any ideas? A: I checked PEEK in NASA’s material out-gassing database. It looks like it will most likely meet the 1% … Continue reading

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Q: What is the difference between a general purpose, SAE, USS and oversized washer? Are they all flat washers or different styles. And is one better than the other? A: General purchase, SAE, USS and oversize are all flat washers and all serve the same purpose of distributing the load … Continue reading

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Q: I’m looking for polymer that can withstand around 400F for a high temperature sterilization process in a pharmaceutical application. In addition, I also need the polymer to meet FDA and USDA purity standards. Is this possible with Torlon screws. A: Torlon screws are a good high temperature polymer that … Continue reading

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Q: I’m currently cruising the internet looking for the best way to support a ceiling via suspension from structural steel. We’re building a freezer, and I don’t want thermal bridging from the inside of the freezer up to the structural steel, so a metal rod is pretty much out of … Continue reading

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Q: I’m confused about the difference between a hex head bolt and hex cap screw? Is there a difference? A: Yes these are two different types of fasteners. A hex head bolt is just that: a bolt with a head head. It is typically used when mechanical properties are more … Continue reading

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Q: What is the difference between an allen, hex and socket driver? A: All these drivers are the same. They can be offered in a socket head cap screw (hence the term socket), pan head and flat head. An allen/hex/socket drive offers a more secure connection than say a flat … Continue reading

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Q: We are attaching steel to aluminum in a drainage pond application, and need to prevent electrolysis. The aluminum materials are degrading prematurely. Is there a non-conductive bolt that would work for this situation? A: Your best bet is if you can use a polymer bolt like PEEK. PEEK bolts … Continue reading

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Q: I have a customer who is looking for some Inconel flat head screws and specifically called out 100°. Is this the standard? A: Flat head screws, also known as countersunk screws, are able to be manufactured with 6 different angles – 60°, 82°, 90°, 100°, 110° and 120°. The most … Continue reading

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Q: I’m looking for a polymer fastener that can withstand ultraviolet radiation, but is also FDA approved as this is for a pharmaceutical application. Temperatures are around 100C. A: For this application, a good choice would be PVDF fasteners. PVDF screws are both FDA approved and are ideal for handling … Continue reading

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Hex Cap Screws and Hex Bolts – Are they the same?   While most think these parts are the same, they do have some slight differences. Hex head cap screws have a flat washer facing under the head that meet specific tolerances per ASME B18.2.1 whereas a Hex Bolt is flat … Continue reading

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Q: I have a customer requesting a UNJF thread for his Aerospace application. How are these different from a UNF thread?   A: This is a great question as UNJ threaded bolts are not interchangeable with a standard UN, UNC, or UNF nut. An internal UNJ thread will assemble to a standard … Continue reading

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Q: My customer asked for a Hastelloy stud that is threaded first to first. Is this important?   A: This is a very important detail. There are 2 options for threads on studs.  1) First to First and 2) Overall Length (or physical end to other physical end). “First to … Continue reading

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Q: I have a request for a titanium socket head cap screw. The customer asked to have this screw made to DIN specifications but I found two DIN specs for a socket head cap screw. What is the difference between DIN 6912 and 912? A: A titanium DIN 6912 socket … Continue reading

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Q: I have a food processing application that requires a polymer screw that can get hot – about 300F. My concern is outgassing in the heat that can contaminate the food chemicals. Is there something that will not outgas that can work for me? A: For your application I would … Continue reading

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Q: I’m looking for a polymer insert locknut for a marine environment.  Can you make any suggestions? A:  In your marine lock nut application, the polymer you should consider for the locking mechanism would be PVDF (Kynar). PVDF polymer in combination with the lock nut would perform very well in … Continue reading

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Q: I need a polymer flange that for a sterilization process. It would need to withstand temps of about 300F. Any suggestions? A: For this situation I would suggest a PEEK flange. PEEK is strong to temps of about 500F and performs excellently in both high temperature steam and water … Continue reading

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Q: We are looking for a non-conductive  screw that gets close to the strength of 316 stainless steel, ideas? A: The best we could offer would be our glass fiber reinforced PEEK screws. It has nearly double the tensile strength as natural PEEK at about 22,800 psi. You could also … Continue reading

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Q: I’m looking for  threaded rods and nuts that would need to be able to withstand a potential exposure to ferric chloride and constant exposure to 3% hydrochloric acid which could reach 31% in a rare instance, would this PEEK withstand these chemicals? A: PEEK fasteners work well with harsh … Continue reading

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Q:  I need a polymer fastener that offers the best corrosion resistance at high temperatures. I’m using a low percentage of H2SO4 but temps can get up to 300F. Any ideas? A: The best polymer fastener for high temperature corrosion resistance is PTFE screws. PTFE fasteners offer excellent corrosion resistance … Continue reading

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Q: I need a polymer fastener that can withstand high temp pharma sterilization processes? There may also be chemical contaminants in the process. A: Depending on the temperatures you are looking at, the three options to consider would be PEEK, PVDF or PTFE fasteners. PEEK fasteners can be used to … Continue reading

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Q: I’m using PEEK fasteners in hydrochloric acid but am seeing a slight bit of corrosion or degradation of the fastener. Can you recommend a better polymer for resistance? A: For corrosion in HCL, a better choice may be PTFE screws. PTFE fasteners are virtually inert to most organics, acids … Continue reading

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Q: I have a high temperature sterilization process and am using PVDF screws. They seem to be weakening under the temperatures that approach 300F. Any suggestions? A: PEEK fasteners may be a good fit for your application. PEEK screws stay strong and retain their mechanical properties to about 500F. They … Continue reading

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Q: What would be the highest strength polymer fastener I can use to 400F? A: For this application, probably the best option for you would be PEEK fasteners. PEEK screws are usable to 500F and are available in three levels of strength. Unfilled natural PEEK fasteners offer 16,000 psi tensile … Continue reading

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Q: What is the max temperature I could expose PEEK screws to HCl? A: This depends on the concentration of the HCl but if you were at about 15%, the PEEK fasteners can be exposed to about 100C of hydrochloric acid solution. See this chart https://www.extreme-bolt.com/peek-fasteners-flanges.html#Chemical. That is the max … Continue reading

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Q: We are looking for high shear strength non-conductive flat head screws being used for electrical insulation. The screws need to have a high shear strength quality as other plastics screws we have tried have broken. Do you have a material you can recommend? A: With regards to a polymer … Continue reading

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Q: I’m looking for a polymer that can be exposed to low concentration of sulfuric acid. Which polymer do you recommend? I tried PTFE but they don’t seem to be as strong as I need. A: PTFE and PFA fasteners offer the highest polymer corrosion resistance but the trade-off is … Continue reading

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Q: I need a fastener that can withstand frequent sterilization processes at temps to around 400F. I would prefer a polymer if possible. Also the process is pharma related, so the screws would need to be non leaching and may be exposed to low concentrations of chemicals. Any ideas? A: … Continue reading

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Monel HF vs Nickel Alloys revisedQ: Will Nickel 200 bolts be a good choice for hydrofluoric acid? A: For aqueous HF, Nickel 200 fasteners offer limited protection. If application requires a metal then you may want to consider Monel 400. Monel 400 bolts are the most resistant option for hydrofluoric acid in all concentrations up … Continue reading

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Modern day engineering is key to helping the world through this difficult time, and specialty material bolts make it possible. Materials like titanium, PEEK and 17-4PH provide the corrosion resistance and high strength needed for manufacturing and high-tech distribution. This newsletter shows some of the ways Extreme Bolt & Fastener … Continue reading

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Q: We are looking for a non-conductive screw with lower dielectric constant / dissipation factor to replace a steel screw (Tensile Strength 70kpsi) in one of our products. So were trying to get to similar strength / properties to the steel screw to meet our torque requirements. Will a ceramic … Continue reading

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Q: I need a material that is resistant to a small concentration of hydrofluoric acid at room temperature? Can you offer any suggestions? A: Two materials come to mind. First in terms of metal alloys Monel 400 bolts are resistant to most concentrations of hydrofluoric acid. If you prefer a … Continue reading

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Q: We are having some issues with corrosion in a highly sensitive pharma application. I need a bolt that is corrosion resistant to both acids and organics, but is usable in a high purity situation. Temperatures can reach about 120F. Also, it would need to be a polymer screw available … Continue reading

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A. We  need a screw that is usable at 200C in air only, so no chemical resistance needed. I like the high strength of the Carbon Fiber PEKK or PEEK Extreme.  Will these work?A Q: Would recommend using either Glass filled PEEK or Vespel. Vespel screws are made from the … Continue reading

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Q: I have a need for a fastener for cyrogenic Helium (3.5K) application. Ideally, the fastener would be non conductive (electrically). Are any of the non conductive options you have listed good for cryo use? A: You might want to consider PTFE of PEEK fasteners. These are polymers that will … Continue reading

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PEEK, PVDF and PTFE all offer lightweight, electrical & thermal insulation and great corrosion resistance. But when it comes to strength, temperature, purity and corrosion, each has its niche. The newsletter points out which is best to use in different conditions. TEMPERATURE PEEK and PTFE screws offer excellent high temperature … Continue reading

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Q: We have on application that utilizes an HCl tank and are currently using hastelloy C276 bolts but they are not sufficient. Should we try tantalum fasteners or anther material like PEEK? The bolts are for a flanged valves connections  concentration is 36%, temperature 45ºC. A: Though the HCl is … Continue reading

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Q: I need a bolt that can handle high temperatures and be an electric insulator? What can I use? A: That depends on what you mean by high temperature and what other issues you have like the strength requirements. If you are talking about temperatures under 500F, then you may … Continue reading

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Q: I’m looking for a socket head cap screw that is 5/8″-11 x 5.5 inches in length. Need the material to be non-conductive and was thinking Ceramic Zirconia? Would that work? A: Ceramics like Zirconia screws are in fact an excellent insulator from electrical current. However zirconia ceramic fasteners are … Continue reading

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Q: I’m looking for a polymer washer that can be used as a dielectric break between aluminum and titanium. It will also be exposed to salt water. Is torlon a good choice? A: Torlon washers will work in this situation, but there are probably more cost efficient solution for this … Continue reading

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Q: I have a laboratory applications that uses about 25% sulfuric acid at room temperature to 100F. I’d like to use a polymer rather than a metal if possible. I tried PTFE screws because I thought they were corrosion resistant, but they need to be replaced often because they can’t … Continue reading

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Q: We have on application in one HCL tank and we are using hastelloy bolts but they are not efficient. So I ask the quotation for material tantalum in metals or other material like PEEK, please advise what is the better solution. A:  It depends on the temperature of the … Continue reading

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Q:  I’m working with a process that requires a constant operating temperature of 450F. Do I need to use a metal screw or is there a polymer that can handle this? A:  There are definitely polymers that can handle an environment of 450F. One option is a PEEK fastener. PEEK … Continue reading

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I’m running some laboratory testing in a mixed acid environment and would like to use a corrosion resistant polymer as apposed to a metal. I’ve tried PEEK screws but am still struggling a bit with some acids. Is there anything better? PEEK screws provide reasonable corrosion resistance to most acids … Continue reading

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Q: I have an application where I need a non-metal fastener because of insulation and magnetic issues. The problem is that it also needs to be able to retain strength at about 520°F. Should I use a ceramic? A: Ceramic fasteners are definitely not necessary at these temperatures, although they … Continue reading

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Q: I need a fastener that is very low weight and offers good wear resistance for a robotics application. I need about 40 ksi in strength. A: For your application I would actually suggest an engineered polymer fasteners since your strength requirement isn’t high enough to necessitate a metal . … Continue reading

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Q: I am looking for some high tensile strength studs with good electricity resistance. I think zirconia of aluminia material will be suitable but I am open for suggestions. The studs would be about 5 inches long. A: Probably ceramics fasteners are not the best choice for this situation. It … Continue reading

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Q:  I have a question regarding a type of fastener that can handle sterilization. What I need is a polymer if possible that can handle both steam and radiation sterilization processes, but doesn’t leach into my process. Contamination is an issue. A:  You can definitely use a polymer for this … Continue reading

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Q:  I’m designing laboratory equipment that will be utilized at 325-400F and I need screws that have immunity to organics and low concentrations of acids, as well be FDA approved. Would that be a ceramic? A:  You probably don’t want a ceramic screw. Though they are corrosion resistant and offer … Continue reading

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Q: I’m building some lab equipment what will be housing hydrochloric acid. I need a non-metal fastener that is corrosion resistant . Can you make a recommendation? A: In terms of a material that is not metallic and can handle hydrochloric acid, I would suggest either PTFE or PVDF. PTFE … Continue reading

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Q: I have an application where I need pan head, insulating, high vacuum compatible, screw. It will also need to be usable at a service temperature up to 150C. Do I need a ceramic? A: Though ceramics are excellent insulators, they are usually only used for high temperature applications, where … Continue reading

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Q: I’m looking for a chemically resistant polymer that can withstand chlorine and chlorine dioxide as well as a decent amount of weight and tension (around 27 lbs of weigh). Can you suggest a material? A: Of course it depends on the concentrations and temperatures you are operating at but generally … Continue reading

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Q: How does creep occur and what polymer is best to prevent this? A: Creep is the permanent deformation of the material caused by constant load or stress, usually accompanied by constant high temperature. This can result in permanent changes of the fastener shape as well weakening and fracturing of the … Continue reading

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Q: Need to replace a standard steel washer with a non-conductive material. A:   After speaking with this customer, I learned that he needed to replace a standard steel washer with a non-conductive material for a critical bolted joint. These washers needed to withstand 70°C temperatures while maintaining preload. He … Continue reading

Posted in Corrosion Resistance, Engineered Polymer Fasteners, FAQs, Non-Conductive, Technical Questions | Tagged , , , , , , , , , , | Leave a comment

Q: Can you provide alternative for a nylon pan head screw? A:   Here the customer needed an alternative to nylon. Resistance to electrical fields was a primary concern. In addition, he also needed a material that had a better dissipation factor than nylon. In this situation we would recommend PEEK. It … Continue reading

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Q: Need help with specific needs regarding Polyimide fasteners and their high temperature capabilities A:   This Italian company was developing a new client oven.  They were interested in Polyimide fasteners and their high temperature capabilities. In particular they needed: Usability to 300°C Capability with metal connections Heat and electric … Continue reading

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Q: Polyimide / Vespel fasteners and their high temperature capabilities A:   This client is developing a new oven application and was interested in Polyimide fasteners and their high temperature capabilities. In particular they needed:

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