Thread Pitch Chart

thread pitch chart
thread pitch chart

Coarse Thread Series – UNC

Nominal Size and Threads Per In.Basic Pitch Dia.Section at Minor Dia.Tensile Stress Area
In.Sq in.Sq in.
3⁄8 – 160.33440.06780.0775
7⁄16 – 140.39110.09330.1063
1⁄2 – 130.450.12570.1419
9⁄16 – 120.50840.1620.182
5⁄8 – 110.5660.2020.226
3⁄4 – 100.6850.3020.334
7⁄8 – 90.80280.4190.462
1 – 80.91880.5510.606
11⁄8 – 71.03220.6930.763
11⁄4 – 71.15720.890.969
13⁄8 – 61.26671.0541.155
11⁄2 – 61.39171.2941.405
13⁄4 – 51.62011.741.9
2 – 41⁄21.85572.32.5
21⁄4 – 41⁄22.10573.023.25
21⁄2 – 42.33763.724
23⁄4 – 42.58764.624.93
3 – 42.83765.625.97
31⁄4 – 43.08766.727.1
31⁄2 – 43.33767.928.33
33⁄4 – 43.58769.219.66
4 – 43.837610.6111.08

Fine Thread Series – UNF

Nominal Size and Threads Per In.Basic Pitch Dia.Section at Minor Dia.Tensile Stress Area
In.Sq in.Sq in.
3⁄8 – 240.34790.08090.0878
7⁄16 – 200.4050.1090.1187
1⁄2 – 200.46750.14860.1599
9⁄16 – 180.52640.1890.203
5⁄8 – 180.58890.240.256
3⁄4 – 160.70940.3510.373
7⁄8 – 140.82860.480.509
1 – 120.94590.6250.663
11⁄8 – 121.07090.8120.856
11⁄4 – 121.19591.0241.073
13⁄8 – 121.32091.261.315
11⁄2 – 121.44591.5211.581

8-Thread Series – 8UN

Nominal Size and Threads Per In.Basic Pitch Dia.Section at Minor Dia.Tensile Stress Area
In.Sq in.Sq in.
1 – 80.91880.5510.606
11⁄8 – 81.04380.7280.79
11⁄4 – 81.16880.9291
13⁄8 – 81.29381.1551.233
11⁄2 – 81.41881.4051.492
15⁄8 – 81.54381.681.78
13⁄4 – 81.66881.982.08
17⁄8 – 81.79382.32.41
2 – 81.91882.652.77
21⁄4 – 82.16883.423.56
21⁄2 – 82.41884.294.44
23⁄4 – 82.66885.265.43
3 – 82.91886.326.51
31⁄4 – 83.16887.497.69
31⁄2 – 83.41888.758.96
33⁄4 – 83.668810.1110.34
4 – 83.918811.5711.81