Thread: Bolt Holes
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Unread 22-12-2011, 22:53
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Re: Bolt Holes
There are other reasons to drill holes larger than necessary for the bolt in question. A 14-20 bolt will easily fit in a 1/4 in. hole, but if the hole is in aluminum, once you have tightened the bolt, you have deformed the hole so that the bolt will be difficult to remove and reinsert the next time.

In different applications, hole clearance varies. For precision machines, specified clearance is less than for architectural use, for instance.

Use of a good, appropriate chart is suggested.

Dr. Bob