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 |
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