Screw or tapping screw

Screw or tapping screw

  • CN 1,705,758 A
  • Filed: 10/17/2003
  • Published: 12/07/2005
  • Est. Priority Date: 10/17/2002
  • Status: Active Application
First Claim
Patent Images

1. screw or tapping screw is characterized in that, have the ultra-fine grain structure of the following ferrite crystal grain of average crystal grain diameter 3 μ

  • m, and surface element has nitride layer.

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