Unified (Coarse) Thread Standard Dimensions

2A standard dimensions Pitch Maximum outer diameter (mm) × Groove diameter (mm)
No.1-64 0.3969 1.838 × 1.351
No.2-56 0.4536 2.169 × 1.612
No.3-48 0.5292 2.496 × 1.846
No.4-40 0.635 2.824 × 2.044
No.5-40 0.635 3.154 × 2.374
No.6-32 0.7938 3.484 × 2.512
No.8-32 0.7938 4.142 × 3.169
No.10-24 1.0583 4.800 × 3.502
No.12-24 1.0583 5.461 × 4.163
1/4-20 1.27 6.322 × 4.765
5/16-18 1.4111 7.907 × 6.174
3/8-16 1.5875 9.491 × 7.543
7/16-14 1.8143 11.076 × 8.851
1/2-13 1.9538 12.661 × 10.264
9/16-12 2.1167 14.246 × 11.650
5/8-11 2.3091 15.834 × 13.002
3/4-10 2.54 19.004 × 15.887
7/8-9 2.8222 22.176 × 18.714
1-8 3.175 25.349 × 21.452
1.1/8-7 3.6286 28.519 × 24.066
1.1/4-7 3.6286 31.694 × 27.241
1.3/8-6 4.2333 34.864 × 29.669
1.1/2-6 4.2333 38.039 × 32.844
1.3/4-5 5.08 44.381 × 38.148
2-4.1/2 5.6444 50.726 × 43.802
2.1/4-4.1/2 5.6444 57.076 × 50.152
2.1/2-4 6.35 63.421 × 55.631
2.3/4-4 6.35 69.768 × 61.978
3-4 6.35 76.118 × 68.328
3.1/4-4 6.35 82.466 × 74.676
3.1/2-4 6.35 88.816 × 81.026
3.3/4-4 6.35 95.163 × 87.373
4-4 6.35 101.513 × 93.723

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