BS4518 O-ring Sizes

Millimeters
International O-ring Standard Sizes
BS4518 British Standard O-ring sizes (metric)
BS4518
Inches
Internal Internal Cross Internal Internal Cross
Diameter Diameter Section Standard O-ring Size Diameter Diameter Section
(mm) Tolerance +/- (mm) (inches) Tolerance +/- (inches)
58.60 0.40 BS4518 0586-24 2.307 0.016
59.60 0.40 BS4518 0596-24 2.346 0.016
61.60 0.40 BS4518 0616-24 2.425 0.016
62.60 0.40 2.40
BS4518 0626-24 2.465 0.016
+/- 0.08
64.60 0.40 BS4518 0646-24 2.543 0.016
67.60 0.40 BS4518 0676-24 2.661 0.016
69.60 0.40 BS4518 0696-24 2.740 0.016
19.50 0.25 BS4518 0195-30 0.768 0.010
21.50 0.25 BS4518 0215-30 0.846 0.010
22.50 0.25 BS4518 0225-30 0.886 0.010
24.50 0.25 BS4518 0245-30 0.965 0.010
25.50 0.25 BS4518 0255-30 1.004 0.010
26.50 0.25 BS4518 0265-30 1.043 0.010
27.50 0.25 BS4518 0275-30 1.083 0.010
29.50 0.25 BS4518 0295-30 1.161 0.010
31.50 0.30 BS4518 0315-30 1.240 0.012
32.50 0.30 BS4518 0325-30 1.280 0.012
34.50 0.30 BS4518 0345-30 1.358 0.012
35.50 0.30 BS4518 0355-30 1.398 0.012
36.50 0.30 BS4518 0365-30 1.437 0.012
37.50 0.30 BS4518 0375-30 1.476 0.012
39.50 0.30 BS4518 0395-30 1.555 0.012
41.50 0.30 BS4518 0415-30 1.634 0.012
42.50 0.30 BS4518 0425-30 1.673 0.012
44.50 0.30 BS4518 0445-30 1.752 0.012
49.50 0.30 BS4518 0495-30 1.949 0.012
54.50 0.40 BS4518 0545-30 2.146 0.016
55.50 0.40 BS4518 0555-30 2.185 0.016
57.50 0.40 BS4518 0575-30 2.264 0.016
59.50 0.40 BS4518 0595-30 2.343 0.016
62.50 0.40 BS4518 0625-30 2.461 0.016
64.50 0.40 BS4518 0645-30 2.539 0.016
69.50 0.40 BS4518 0695-30 2.736 0.016
74.50 0.40 3.00
BS4518 0745-30 2.933 0.016
+/- 0.10
79.50 0.40 BS4518 0795-30 3.130 0.016
84.50 0.50 BS4518 0845-30 3.327 0.020
89.50 0.50 BS4518 0895-30 3.524 0.020
94.50 0.50 BS4518 0945-30 3.720 0.020
99.50 0.50 BS4518 0995-30 3.917 0.020
104.50 0.50 BS4518 1045-30 4.114 0.020
109.50 0.50 BS4518 1095-30 4.311 0.020
114.50 0.50 BS4518 1145-30 4.508 0.020
119.50 0.50 BS4518 1195-30 4.705 0.020
124.50 0.60 BS4518 1245-30 4.902 0.024
129.50 0.60 BS4518 1295-30 5.098 0.024
134.50 0.60 BS4518 1345-30 5.295 0.024
139.50 0.60 BS4518 1395-30 5.492 0.024
144.50 0.60 BS4518 1445-30 5.689 0.024
149.50 0.60 BS4518 1495-30 5.886 0.024
154.50 0.60 BS4518 1545-30 6.083 0.024
159.50 0.60 BS4518 1595-30 6.280 0.024
164.50 0.60 BS4518 1645-30 6.476 0.024
169.50 0.60 BS4518 1695-30 6.673 0.024
174.50 0.60 BS4518 1745-30 6.870 0.024
179.50 0.60 BS4518 1795-30 7.067 0.024
184.50 0.80 BS4518 1845-30 7.264 0.031
189.50 0.80 BS4518 1895-30 7.461 0.031
194.50 0.80 BS4518 1945-30 7.657 0.031
199.50 0.80 BS4518 1995-30 7.854 0.031
209.50 0.80 BS4518 2095-30 8.248 0.031
0.094
+/- 0.003
0.118
+/- 0.004
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