■ for Whitworth Threads ■ for Sewing Machine Screw Threads

unit: mm unit: mm

Major Minor Major Minor

Pitch Diameter Pitch Diameter

Diameter Diameter Diameter Diameter

Size Class Upper Lower Size Class Upper Lower

Tolerance Tolerance Tolerance Tolerance

Basic Size Basic Size Basic Size Basic Size Basic Size Basic Size

(μm)(μm)(μm)(μm)
1/8 W 40P13.1752.76825102.3621/16 SM 80P11.5881.38225101.176
5/32W 32P23.9693.46040202.9525/ 64 SM 64P11.9841.72625101.468
3/16 W 24P24.7624.08540203.4073/ 32 SM 56P12.3812.08625101.791
7/32 W 24P25.5564.87940204.2013/ 32 SM 100P12.3812.21625102.051
1/4 W 20P26.3505.53740204.7241/ 8 SM 40P23.1752.76340252.351
5/16 W 18P27.9387.03440206.1301/ 8 SM 44P23.1752.80040252.425
3/8 W 16P29.5258.50940207.4939/ 64 SM 40P23.5723.16040252.748
7/16 W 14P311.1129.95060408.78811/ 64 SM 40P24.3663.95440253.542
1/2 W 12P312.70011.34560409.9903/16 SM 24P24.7624.07540203.388
9/16 W 12P314.28812.933604011.5783/16 SM 28P24.7624.17340203.584
5/8 W 11P315.87514.396604012.9173/16 SM 32P24.7624.24640203.730
3/4 W 10P319.05017.424604015.7983/16 SM 40P24.7624.35040253.938
7/8 W 9P322.22520.418604018.6117/ 32 SM 32P25.5565.04040204.524
1 W 8P325.40023.367602021.33415/ 64 SM 28P25.9535.36440204.775
1 1/8W 7P428.57526.252804023.9291/4 SM 24P26.3505.66340204.976
1 1/4W 7P431.75029.427804027.1041/4 SM 40P16.3505.93825105.526
1 3/8W 6P434.92532.214804029.503
1 1/2W 6P438.10035.389804032.678
1 5/8W 5P441.27538.022804034.769
1 3/4W 5P444.45041.197804037.944
1 7/8W 4.5P447.62544.011804040.397
2 W 4.5P450.80047.186804043.572