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Tension control of fasteners

  • US 4,219,922 A
  • Filed: 04/19/1979
  • Issued: 09/02/1980
  • Est. Priority Date: 04/19/1979
  • Status: Expired due to Term
First Claim
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1. A method for monitoring the sequential tightening of a multiplicity of substantially identical joints including at least one threaded fastener, comprisingtightening the fastener beyond the yield point thereof;

  • sensing torque and not load applied to the fastener at various angles of advance; and

    determining, from the sensed values, the stress appearing in the fastener at the termination of tightening at a stress value adjacent the fastener yield point which stress differs from the nominal strength of the fastener and which varies from joint to joint.

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