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The American National Standard Series translates into the Unified National Standard Series screw thread as follows: NC changes to UNC and NF changes to UNF.Neiko Tools U.S.A. Tap and Hexagon Die Set SAE High Alloy Steel 7 piece Tap and 17 piece Die: 4-40 unc 6-32 unc 8-32 unc 10-24 unc 10-32 unf 12-24 unc 1/4-20 unc 1/4-28 unf 5/16-18 unc 5/16-24 unf 3/8-16 unc 3/8-24 unf 7/16-14 unc 7/16-20 unf 1/2-13 unc 1/2-20 unf 1/8 NPT 27
- Tap and Hexagon Set
- SAE