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Method and apparatus for fastener tensioning

  • US 4,104,778 A
  • Filed: 01/27/1977
  • Issued: 08/08/1978
  • Est. Priority Date: 01/27/1977
  • Status: Expired due to Term
First Claim
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1. A method of threaded fastener tensioning comprising:

  • rotating the fastener;

    monitoring the torque and rotation applied to the fastener to determine when the rate of change of torque increase per unit of rotation becomes a constant; and

    rotating the fastener a prescribed rotary angle after said rate of change of torque increase per unit of rotation becomes a constant.

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