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Multi-tier security fastener

  • US 6,017,177 A
  • Filed: 10/06/1997
  • Issued: 01/25/2000
  • Est. Priority Date: 10/06/1997
  • Status: Expired due to Term
First Claim
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1. A multi-tier security fastener comprising a body having a longitudinal axis, a first tier on said body, a drive pattern on said first tier, said drive pattern being located on a first surface extending in an axial direction relative to said longitudinal axis, second and third key-receiving tiers on said body axially spaced from said first tier, second and third key-receiving surfaces on said second and third key-receiving tiers, respectively, extending in axial directions relative to said longitudinal axis, said first and second and third tiers having an index of between about 0.625 and 1.0 which is the sum of the ratios of the axial length to diameter of each tier.

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