In support of a paper on the calculation of pressure cone angle, originally written for presentation at the annual meeting of ASTM F16.96 Bolting Technology Subcommittee, we took scans of under head pressure for various fastener styles. While the entire study was rewritten in an article posted to the "In the News" section of our website, two findings related to under head pressure are extracted here because they likely have the widest reader interest.
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