Resource to help ID misc milsurp parts?

[Flying10uk]

With screw threads you can often make an educated guess just by looking at the thread once you get a little experience. For example, the middle pic, all of the screws in this pic appear to have a relatively coarse thread apart from the screw on the far right of the pic which is slightly finer but still relatively coarse. You haven't told us the diameter of the screws but they sort of look like they may be 1/4" dia. Assuming that they are 1/4" dia. I would be checking them against the common coarse 1/4" dia screw threads such as 1/4" B.S.W. and U.N.C.

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