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Fastener markings

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  • Steve D.
    Expired
    • February 1, 2002
    • 990
    #1

    Fastener markings

    3 marks on a bolt head indicates Grade 5. If a small triangle also appears on the head, does this signify anything, or is it just a manufacturer's mark?

    Steve
    Tags: None
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    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43203
      #2
      Re: Fastener markings

      Steve-----

      The "triangle" bolt head marking is the fastner manufacturer's identification mark. This is a VERY common headmarking for later GM SERVICE bolts as well as bolts available in many hardware stores.
      In Appreciation of John Hinckley
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