July 2026 Tip: National Screw Thread Series

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This month's downloadable tip is a 1-page PDF - National Screw Thread Series. This file includes pitch diameter limits for class 2 screws and nuts in the national fine series. The chart includes sizes 0 to1 1/2, threads per inch 80 to 12, basic pitch diameter .0519 to 1.4459, minimum screw sizes .0502 to 1.4403, maximum screw sizes .0519 to 1.4459, minimum nut sizes .0519 to 1.4459, and maximum nuts sizes .0536 to 1.4515. See the sample below:

national screw thread series

Thanks for visiting MachinistKalc.com.


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