ASTM A307 / A563 Fasteners standard covers pressure-temperature. “At that point, you’re getting roughly the same tension accuracy achieved by using only a torque-based solution, so it makes little sense to invest in tension-measuring fasteners,” Brooks added.įor more information, visit or call (602) 269-5748. Fasteners dimensions, dimensional tolerances are defined in the ASTM A307 standards. This extends fastener life and helps to prevent machinery and equipment from operating with bolts that are out of tension - the leading cause of bolt failure.īrooks explained the Valley Forge Maxbolt and SPC4 occupy a valued space in the current ASTM F2482 standard among mechanical and electronic-type fasteners, as competitors generally can only deliver +/- 25-percent accuracy. Because Maxbolt and SPC4 can literally tell maintenance personnel, by percentage of load, how close they are to appropriate tension, those maintenance workers can make timely, better-informed decisions about when to retorque, replace or leave bolts alone. The ASTM F2482 standard promotes safety by its sheer accuracy at measuring tension from within the critical joint. “It is for applications where reliability, safety and certifiable product performance are critically important.” Grade A consists of a heavy zinc phosphate coating with no additional sealer (dry), Grade B consists of a heavy zinc phosphate coating with a dry organic sealer, Grade C consists of a. ASTM F1137 specification covers the basic requirements for six grades of corrosion protection for fasteners. “If the customer is serious about controlled bolting for their critical joints, it will be important to them that the fasteners they use achieve the +/- 5-percent accuracy standard,” said James Brooks, director of engineering. Stud Bolts, Nuts, Screws, Threaded Rod & Washers. After two years, peer collaboration and several ballots, the standard was accepted.Ĭurrently, 17 years after the acceptance of the ASTM F2482 standard, Valley Forge products are still the only ones that comply with the specification that fasteners accurately measure tension as a percentage of load to within +/- 5 percent. In 2002, Valley Forge & Bolt, maker of patented bolting products, recognized the importance of having a consensus standard detailing the requirements for load-indicating fasteners and approached a subcommittee of the F16 Committee on Fasteners. The ASTM process for creating new standards requires collaboration among industry participants to develop and finalize language and standards, then a wider vote to accept it. In existence for more than a century, ASTM is the largest organization in the world for developing and publishing voluntary, full-consensus standards. Whether it’s the International Organization for Standardization (ISO), Deutsches Institut für Normung (DIN), American Society of Mechanical Engineers (ASME), American National Standards Institute (ANSI), or American Society for Testing Materials (ASTM),each serves a specific purpose.ĪSTM F2482 is the standard that covers “externally threaded … fasteners, capable of indicating clamping forces up to yield strength during the tightening process or post installation residual tension, or both” - in other words, fasteners that indicate tension.
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