Screw - University of Utah

12.1 ISO metric screw thread. 12.2 Whitworth. 12.3 British Association screw threads (BA) ... Machine screws are described as 0-80, 2-56, 3-48, 4-40, 5-40, 6-32, 8-32, 10-32, 10-24, etc. up to size 16. The first number can be translated to a diameter using a formula, the second is the number of threads per inch. ... The numbering system follows ... ................
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