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  1. par96

    tapping of 4140 steel

    unclesyd, I was planning on specifing a 5/8" dia. countersunk bolt w/ 11 unc (1 1/2" of thread). Approximate bolt length of 2". Tapping approx. a 2" long hole into the piece of 4140 steel. The existing drawings call out for the clamp (4140 stl.) to be heat treated to 275-300 B.H.N. before...
  2. par96

    tapping of 4140 steel

    Is it possible to tap 4140 steel in the field? Is it possible to tap 4140 steel in general? I have a filler plate that i need to attach to a piece of 4140 steel, but this filler plate needs to be interchangeable with a thicker plate so welding is out of the question. thanks

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