unc screw dimensions

When I first entered the screw industry, the first contact was the metric screw. I didn’t know much about the unc screw. When I received an inquiry from the US one day, the size marked on it was unfamiliar to me, so I started to look for information online. . Today we will talk about the unc screw dimensions.

How is the unc screw dimensions generally expressed? For example, 4#-40*1/2, this is the representation of the size of the unc screw. Do you want to know what this means? 4# indicates the diameter of the thread, which is 2.84mm for the metric system. 40 indicates the number of teeth of the screw, that is, the distance of 1 inch is 40 threads. The metric pitch is 25.4mm/40=0.635. The thread length is 1/1. 2 inches, ie 0.5*25.4=12.7mm.

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