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Direct tension indicating washers

  • US 5,769,581 A
  • Filed: 02/21/1997
  • Issued: 06/23/1998
  • Est. Priority Date: 02/21/1997
  • Status: Expired due to Term
First Claim
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1. A direct tension indicating and maintaining washer comprising:

  • a first surface having at least one protuberance formed thereon for indicating bolt tension;

    a second surface having at least one indentation formed opposite said protuberance;

    an opening having an inner diameter wall, said inner diameter wall meeting said second surface at an inner diameter edge;

    an outer diameter wall meeting said second surface at an outer diameter edge;

    wherein said inner diameter edge and said outer diameter edge lie in different planes, said first surface and said second surface being planar and defining a frusto-conical shape for maintaining tension on a bolt upon installation.

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