Standard SAE Thread Sizes: 6-32, 8-32, 10-24, 10-32, 12-24, 1/4-20, 1/4-28 Fine, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20, 9/16-12, 9/16-18, 5/8-11, 5/8-18, 3/4-10, 3/4-16. Standard (SAE).
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