M i l l i m e t e r s
I n c h e s
BS451 8
Internal Diameter (mm)
Internal Diameter Tolerance +/-
Cross Section (mm)
Standard O-ring Size
Internal Diameter (inches)
Cross Section (inches)
3.1
0.15
BS4518 0031-16
0.122
0.006
4.1
BS4518 0041-16
0.161
5.1
BS4518 0051-16
0.201
6.1
BS4518 0061-16
0.24
7.1
BS4518 0071-16
0.28
8.1
BS4518 0081-16
0.319
9.1
BS4518 0091-16
0.358
10.1
0.2
BS4518 0101-16
0.398
0.008
11.1
BS4518 0111-16
0.437
12.1
BS4518 0121-16
0.476
13.1
BS4518 0131-16
0.516
14.1
1.6
BS4518 0141-16
0.555
0.063
15.1
+/- 0.08
BS4518 0151-16
0.594
+/- 0.003
16.1
BS4518 0161-16
0.634
17.1
BS4518 0171-16
0.673
18.1
0.25
BS4518 0181-16
0.713
0.01
19.1
BS4518 0191-16
0.752
22.1
BS4518 0221-16
0.87
25.1
BS4518 0251-16
0.988
27.1
BS4518 0271-16
1.067
29.1
BS4518 0291-16
1.146
32.1
0.3
BS4518 0321-16
1.264
0.012
35.1
BS4518 0351-16
1.382
37.1
BS4518 0371-16
1.461
3.6
BS4518 0036-24
0.142
4.6
BS4518 0046-24
0.181
5.6
BS4518 0056-24
0.22
6.6
BS4518 0066-24
0.26
7.6
BS4518 0076-24
0.299
8.6
BS4518 0086-24
0.339
9.6
BS4518 0096-24
0.378
10.6
BS4518 0106-24
0.417
11.6
BS4518 0116-24
0.457
12.6
BS4518 0126-24
0.496
13.6
BS4518 0136-24
0.535
14.6
BS4518 0146-24
0.575
15.6
BS4518 0156-24
0.614
16.6
BS4518 0166-24
0.654
17.6
BS4518 0176-24
0.693
18.6
BS4518 0186-24
0.732
19.6
BS4518 0196-24
0.772
20.6
2.4
BS4518 0206-24
0.811
0.094
21.6
BS4518 0216-24
0.85
24.6
BS4518 0246-24