Bolt strength

[David H. Wedeking <davew@gandalf.ecb.tek.com>]

Supplemential info on Graded bolt discussion:

SAE     Bolt size, dia         Proof load     Min tensile
grade         in.                  psi       strength, psi

  1     All sizes                ....            55,000
  2     Up to 1/2 incl           55,000          69,000
        Over 1/2 to 3/4 incl     52,000          64,000
        Over 3/4 to 1 1/2 incl   28,000          55,000
  3     Up to 1/2 incl           85,000         110,000
        Over 1/2 to 5/8 incl     80,000         100,000
  5     Up to 3/4 incl           85,000         120,000
        Over 3/4 to 1 incl       78,000         115,000
        Over 1 to 1 1/2 incl     74,000         105,000
  7     up to 1 1/2 incl        105,000         133,000
  8     Up to 1 1/2 incl        120,000         150,000

Source: Mark's Mechanical Engineering Handbook

I am still looking for a set of diagrams for head markings.

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| Dave Wedeking                |                                             |
| davew@gandalf.ECB.TEK.COM    |         1967 Sunbeam Tiger Mk 1A            |
| 503-359-9300  x4450          |                                             |
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