Info needed: Rethreading nuts and bolts

[rob love]

Sounds like you are going to need to order a couple of sets of pitch gauges, a caliper, and google some thread charts. After a time, you will start to recognize the threads on he bolts at least, but much harder to do on nuts.

Generally, these days you can tell the thread type by the head markings (but not always...I have seen standard bolts with metric grade markings), but those rules did not apply to the WW2 time period. The Hotchkiss name brings up another anomaly that I recall. Didn't they use standard threads but with metric heads on their M201 Willys engine production?