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124 THE DISTRIBUTOR’S LINK GUY AVELLON WHAT FASTENER DISTRIBUTORS NEED TO KNOW ABOUT FAST FASTENER FACTS AND ANSWERS from page 48 [10] A lock washer will not prevent loss of preload. a. If the clamp load is not significantly higher than the external service load, nothing will prevent loosening and loss of preload. [11] If the assembly did not come with a lock washer as OEM, Never put one on the fastener. a. Reread above. [12] No locking device will ever prevent loss of preload. a. Nothing will guarantee against loss if the joint materials, fastener components and installation torque are not compatible. [13] Metal prevailing torque lock nuts are reusable, nylon insert nuts are not. Choose the metal nuts if you expect frequent maintenance. a. Prevailing torque lock nuts have a lubricant applied which reduces thread friction. b. A nylon nut is like a standard nut, it has dry threads which promote an increase in friction and an increase in torque. c. The nylon will also provide less drag with each reuse due to wear. [14] Any locking device will not always adequately perform in every application. a. Lock washers are good for sheet metal and small screws, not 1-1/2” bolts. b. Thread locking chemicals do not act alike, read the labels. [15] Thread locking chemicals are good for low impact and low vibration loads. a. Never rely on any locking device to stop loosening or loss of preload. b. Preload must be sufficient to overcome predictive service loads. Installation [16] Any fastener made can and will fail if not properly installed. a. There are hundreds of variables to consider that will cause loss of clamp load. [17] Each joint is unique. a. What you do for one joint may not be good for another. [18] Impact wrenches are NOT for installing fasteners. EVER. a. They have too much uncontrolled initial impact torque. [19] Uniform tightening is more important than torque. a. If one side is tighter than the other, loosening occurs. [20] Tightening technique affects the connection more than torque. a. How compressible is the joint? b. Were incremental torques used along with a torque pattern? [21] Never apply full torque to a fastener during initial tightening, especially with multiple fasteners in a single joint connection. a. The first fastener will become tighter, and then it loosens as the rest are tightened. b. Tighten in torque increments. [22] If it is a critical connection, retighten the fastener after two minutes and again after a load has been applied. a. This is due to normal compression set of the materials, joint and fastener. b. There is no such thing as a non-compressible gasket. Every material relaxes, every material is compressible. [23] Torquing the head of the fastener takes more torque than tightening the nut. a. A torsional twist is applied to the body of the fastener instead of stretching the threaded section which dissipated the torsion more. When turning the head stops, the fastener ‘unwinds’ itself and therefore loses both stretch and clamp load. b. This effect is reduced if the fastener is lubricated. [24] Use incremental loading when tightening multiple fasteners in the same joint as well as using a criss-cross pattern. a. This produces an evenly loaded joint connection. CONTINUED ON PAGE 172
Powell Systems (PSI) is pleased to announce the hiring of fastener industry veteran Jim Witucki. Witucki has been in the industry over thirty years. He began his career and spent 26-years with Nucor Fastener, where he was sales manager. Most recently, Witucki was the N. American Sales Manager for SKAKO Vibration A/S based in Faaborg Denmark. Founded by William J. Powell as Powell Pressed Steel in Hubbard, Ohio in 1920, PSI has been manufacturing material handling equipment for four generations. The first product was steel tote boxes used to move manufactured material from one work station to another. We pioneered several unique designs with these boxes including gravity-feed and drop-bottom containers. Powell Systems is a fourth generation manufacturer of material handling equipment, pack lines and steel production containers. Powell equipment and containers are found throughout the hardware/fastener industry. In addition to being a manufacturer, PSI is the Dealer for SKAKO Vibration in the USA. According to PSI President Jim Powell, “when SKAKO decided to modify their sales and distribution strategy in the USA, we saw a great opportunity to bring Jim onboard. He was our primary contact at SKAKO and now having him as a member of PSI will make for a seamless transition for all parties but most importantly the customer.” Witucki will be PSI’s internal “SKAKO specialist” as well as leading the sales effort. Witucki will have the same responsibility at PSI as he did while working at SKAKO for over five years. SKAKO is a market leader in vibration technology. SKAKO has over 50-years of experience in vibratory equipment for hardware applications. Vibratory technology provides for gentle and efficient feeding, including highly interlocking parts. To learn more about PSI’s line of products including steel containers, pack lines, as well as SKAKO’s vibratory solutions, contact Powell Systems at 604 E. 9th St., PO Box 345, Fowler, IN 47944. Telephone: 765-884-0613, Email info@powell-systems.com or visit them online at www.powell-systems.com. THE DISTRIBUTOR’S LINK 125
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