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SPRING 2016

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Distributor's Link Magazine Spring Issue 2016 / Vol 39 No2

14 THE DISTRIBUTOR’S

14 THE DISTRIBUTOR’S LINK Guy Avellon Guy Avellon has been in MRO and Fastener Distribution for over 30 years, in such positions Sales Engineer, Chief Engineer, Manager of Product Marketing, Product Engineering & Quality and Director of Quality & Engineering. He founded GT Technical Consultants where he performs failure analysis, lectures on fastener safety, works for law firms and designs/audits Quality systems. He is a member of SAE, is Vice Chairman of the ASTM F16 Fastener Committee, Chairman of the F16.01 Test Methods Committee and received the ASTM Award of Merit in 2005. Guy can be contacted at 847-477-5057, Email: ExpertBoltGuy@gmail.com or visit www.BoltFailure.com. WHAT FASTENER DISTRIBUTORS NEED TO KNOW ABOUT FASTENER REUSE & TORQUE VALUES “Can I reuse your fasteners in a critical application?” Believe it or not, a good friend actually called me and wanted to know where this was written so he could show his customer. I had to write a letter to his customer to explain the circumstances, but it gave me a great idea for this article. There are times when customers ask questions that we have all known the answers to from years of training and experience. But when asked “where is it printed?” we are at a loss to find the exact quote or if any such quote exists. This article will answer several common questions. A distributor should not have to answer specific technical questions because all fastening conditions and applications are unique. Misinterpretation of how the customer is going to use the fastener and under what conditions could lead to tremendous liability for both parties. Here are some of the more commonly asked questions: Can A Fastener Be Reused In A Critical Application? NO. No one can tell how much stress the fastener had endured while in use. The fastener could have been installed beyond its yield point or way below cyclic loading causing stress raisers. Fatigue micro-cracks are not visible. Fasteners are inexpensive when compared with the associated liability. Replace it. Can Fasteners Be Reused Under Normal Conditions? YES, but only ferrous (steel) fasteners that were used under controlled conditions. That is, they were properly installed and the service loads were not heavy or CONTRIBUTOR ARTICLE excessive. Again, the operative word is ‘controlled’ conditions. If the conditions of use are not known, then do not take any chances: No. Non-ferrous fasteners (stainless steel, nickel alloys, silicon bronze, titanium, etc.) will all work harden once placed under a tensile load. Here, one needs to apply discretion; if it is a small fastener, 5/16” or less, chances are it may be reused. But, once a fastener has work hardened, its mechanical properties become severely compromised. Therefore: if any threaded fastener, ferrous or nonferrous, has experienced any loading beyond its proof load or yield strength, that fastener should never be reused again in any application as it no longer safely represents its intended mechanical or physical properties. Can Nuts Be Reused? NO. This is a simple answer to a complex question. There is only one way a nut can be reused and it takes the combination of two events properly used to effect the results. So the simple answer is ‘No’ since we have no idea how the nut was previously installed and under what circumstances. The basic explanation is that the variables of friction prohibit reuse. When the nut is tightened against the threads of the male fastener, the threads of the nut become compressed. The fastener is tightened in tension and, like the coils of a spring, the thread pitch will return to normal once the tension is released. The threads of the nut do not return to its normal pitch dimensions when unloaded. Unlike tensioning, when a material is compressed, it will remain slightly compressed, thereby changing the thread pitch of the nut. CONTINUED ON PAGE 106

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    INNOVATIVE COMPONENTS INC. 1050 Nat

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    Batching Systems, Inc. has been eng

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