British Standard Whitworth Threads Chart

British Standard Whitworth Threads Chart

THREAD DATA CHART
British Thread (British Standard Whitworth) -- Coarse Pitch
Nominal Size Ww Thread Form Type Major Diameter mm d=D Pitch mm p Threads per inch tpi Pitch Diameter mm d2=D2 Minor Diameter Male Thd. d3 Thread Height H1 Tap Drill Diameter mm
1/16" BSW 1.587 0.423 60 1.315 1.050 0.270 1.15
3/32" BSW 2.381 0.529 48 2.041 1.703 0.338 1.90
1/8" BSW 3.175 0.635 40 2.768 2.362 0.406 2.50
5/32" BSW 3.969 0.793 32 3.459 2.952 0.507 3.20
3/16" BSW 4.762 1.058 24 4.084 3.407 0.677 3.70
7/32" BSW 5.556 1.058 24 4.878 4.201 0.677 4.50
1/4" BSW 6.350 1.270 20 5.537 4.724 0.813 5.10
5/16" BSW 7.938 1.411 18 7.034 6.131 0.904 6.50
3/8" BSW 9.525 1.588 16 8.509 7.492 1.017 7.90
7/16" BSW 11.113 1.814 14 9.951 8.789 1.162 9.20
1/2" BSW 12.700 2.117 12 11.345 9.990 1.355 10.40
5/8" BSW 15.876 2.309 11 14.397 12.918 1.479 13.40
3/4" BSW 19.051 2.540 10 17.424 15.798 1.627 16.25
7/8" BSW 22.226 2.822 9 20.419 18.611 1.807 19.25
1" BSW 25.400 3.175 8 23.368 21.335 2.033 22.00
1-1/8" BSW 28.576 3.629 7 26.253 23.929 2.324 24.50
1-1/4" BSW 31.751 3.629 7 29.428 27.104 2.324 27.25
1-3/8" BSW 34.926 4.233 6 32.215 29.505 2.711 30.25
1-1/2" BSW 38.100 4.233 6 35.391 32.680 2.711 33.50
1-5/8" BSW 41.277 5.080 5 38.024 34.771 3.253 35.50
1-3/4" BSW 44.452 5.080 5 41.199 37.946 3.253 38.50
1-7/8" BSW 47.627 5.645 4 1/2 44.012 40.398 3.614 41.25
2" BSW 50.802 5.645 4 1/2 47.187 43.573 3.614 44.50
2-1/4" BSW 57.152 6.350 4 53.086 49.020 4.066 50.00
2-1/2" BSW 63.502 6.350 4 59.436 55.370 4.066 56.00
2-3/4" BSW 69.853 7.257 3 1/2 65.205 60.558 4.647 61.50
3" BSW 76.203 7.257 3 1/2 71.556 66.909 4.647 68.00
3-1/4" BSW 82.553 7.816 3 1/4 77.548 72.544 5.005 73.75
3-1/2" BSW 88.903 7.816 3 1/4 83.899 78.894 5.005 80.00
3-3/4" BSW 95.254 8.467 3 89.832 84.410 5.422 85.50
4" BSW 101.604 8.467 3 96.182 90.760 5.422 92.00
4-1/4" BSW 107.954 8.835 2 7/8 102.297 96.639 5.657 98.00
4-1/2" BSW 114.304 8.835 2 7/8 108.647 102.990 5.657 104.20
4-3/4" BSW 120.665 9.237 2 3/4 114.740 108.625 5.915 110.00
5" BSW 127.005 9.237 2 3/4 121.090 115.176 5.915 116.50
5-1/4" BSW 133.355 9.677 2 5/8 127.159 120.963 6.196 122.50
5-1/2" BSW 139.705 9.677 2 5/8 133.509 127.313 6.196 128.50
5-3/4" BSW 146.055 10.160 2 1/2 139.549 133.043 6.506 134.50
6" BSW 152.406 10.160 2 1/2 145.900 139.394 6.506 141.00