British Standard Whitworth

Note: The information contained here is for referance only of common standards and and may not accurately reflect actual product dimensions.

Please check the product details or ask if any dimension is critical

Nominal
Diameter

TPI

Pitch

Depth
ofThread

Major
Diameter

Effective
Diameter

Minor

Diameter

Area at
bottom of Thread

1/8
3/16
1/4

5/16
3/8
7/16

1/2
9/16
5/8

11/16
3/4
7/8

1
1-1/8
1-1/4

1-1/2
1-3/4
2

2-1/4
2-1/2
2-3/4

3
3-1/4
3-1/2

3-3/4
4
4-1/2

5
5-1/2
6

40
24
20

18
16
14

12
12
11

11
10
9

8
7
7

6
5
4.5

4
4
3.5

3.5
3.25
3.25

3
3
2.875

2.75
2.625
2.5

0.02500
0.04167
0.05000

0.05556
0.06250
0.07143

0.08333
0.08333
0.09091

0.09091
0.10000
0.11111

0.12500
0.14286
0.14286

0.16667
0.20000
0.22222

0.25000
0.25000
0.28571

0.28571
0.30769
0.30769

0.33333
0.33333
0.34783

0.36364
0.38095
0.40000

0.0160
0.0267
0.0320

0.0356
0.0400
0.0457

0.0534
0.0534
0.0582

0.0582
0.0640
0.0711

0.0800
0.0915
0.0915

0.1067
0.1281
0.1423

0.1601
0.1601
0.1830

0.1830
0.1970
0.1970

0.2134
0.2134
0.2227

0.2328
0.2439
0.2561

0.1250
0.1875
0.2500

0.3125
0.3750
0.4375

0.5000
0.5625
0.6250

0.6875
0.7500
0.8750

1.0000
1.1250
1.2500

1.5000
1.7500
2.0000

2.2500
2.5000
2.7500

3.0000
3.2500
3.5000

3.7500
4.0000
4.5000

5.0000
5.5000
6.0000

0.1090
0.1608
0.2180

0.2769
0.3350
0.3918

0.4466
0.5091
0.5668

0.6293
0.6860
0.8039

0.9200
1.0335
1.1585

1.3933
1.6219
1.8577

2.0899
2.3399
2.5670

2.8170
3.0530
3.3030

3.5366
3.7866
4.2773

4.7672
5.2561
5.7439

0.0930
0.1341
0.1860

0.2413
0.2950
0.3461

0.3932
0.4557
0.5086

0.5711
0.6220
0.7328

0.8400
0.9420
1.0670

1.2866
1.4938
1.7154

1.9298
2.1798
2.3840

2.6340
2.8560
3.1060

3.3232
3.5732
4.0546

4.5344
5.0122
5.4878

0.0068
0.0141
0.02720

0.0457
0.0683
0.09410

0.1214
0.1631
0.2032

0.2562
0.3039
0.4218

0.5542
0.6969
0.8942

1.3000
1.7530
2.3110

2.9250
3.7320
4.4640

5.4490
6.4060
7.5770

8.6740
10.0300
12.9100

16.1500
19.7300
23.6500