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Re: Subject: Bolt grades

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The "x.y" designation for bolt grades indicates bolt strength, where "x" is
the ultimate tensile stress, fu, in 100s of megaPascals (100MPa), and ".y"
is the ratio between characteristic yield stress, fy, and ultimate tensile
stress; fy/fu.
Thus a 4.8 bolt has ultimate tensile stress equal to fu = 400 MPa, and
characteristic yield stress fy = 0.8fu = 320 MPa.

Gunnar Hafsteinn Isleifsson

    -----Original Message-----
    From: Alberto Guida <GRUPOCG(--nospam--at)>
    To: Seaint <seaint(--nospam--at)>
    Date: 5. marts 1999 19:02

    I am using a british program for steel design. British Code BS5950
(1990) uses  grade 3.6, 4.6, 4.8, ..., for bolts.
    Some body knows what this means?

    Thank you very much

    Alberto Guida