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Use of NS bolts with two gas holes
When was the nickle steel bolt with two gas relief holes first used? TIA
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Last edited by RBruce; 04-19-2010 at 08:47 AM.
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12-03-2009 05:04 AM
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If you are asking about the nickle steel, the change was made at #1,275,767. If you are asking about the holes, I can't help.
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Originally Posted by
RBruce
When was the nickle steel bolt with two gas relief holes first used? TIA
Very early 1937.
Happy Holidays!
J.B.
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