2014 August 1: Prices exclude Freight and GST. Subject to change without notice
376
O Rings
Millimetres
Inches
Inner
Diameter
(mm)
Inner
Diameter
Tolerance
+ / -
Cross
Section
(mm)
Inner
Diameter
(inches)
Inner
Diameter
Tolerance
+ / -
Cross
Section
(inches)
8.00
1.00
4.47
0.13
1.78
+/- 0.08
0.176
0.005
0.070
+/- 0.003
5.28
0.13
0.208
0.005
6.07
6.75
0.13
7.66
0.13
0.301
0.005
8.73
9.25
0.13
0.364
0.005
10.82
11.11
0.13
12.42
0.18
0.489
0.005
15.60
0.23
0.614
0.009
17.17
0.23
0.676
0.009
18.77
0.23
0.739
0.009
20.35
0.23
0.801
0.009
23.52
1.80
.13
1.80 +/- 0.08
.0171
0.005
0.071
+/- 0.003
48.00
2.0
3.66
2.4
9.3
2.4
10.30
2.4
34.6
23.47
2.62
+/- 0.08
6.02
0.13
0.237
0.005
0.103
+/- 0.003
7.59
0.13
0.299
0.005
9.19
0.13
0.362
0.005
9.93
0.13
10.77
0.13
0.424
0.005
12.37
.013
13.10
0.13
15.08
17.12
0.23
0.674
0.009
17.13
17.86
17.96
20.24
20.29
0.25
56.82
0.43
67.95
113.97
0.76
117.13
133.02
O RINGS
2 O-ring standards - USA/UK vs Metric
O-rings can be obtained in various metric and inch standard sizes. Sizes are specified by an inside diameter (ID) and cross section diameter (CS
or W or thickness). For USA O Rings, this combination is referred to as the “Dash” number
The “standard” for O rings has been consolidated in ISO 3601-1:2008, which defines 5 standard Cross Section sizes in both inch and metric terms.
The previous “standard”, which is still commonly used in the USA & UK markets, was Aerospace Standard AS568. This standard has 8 common
Cross Section sizes and is only measured in inches (though sometimes converted to metric for information only).
As seen below, the Cross Section sizes between the two standards is close, but not exactly the same
Nipples & Couplings
O Rings
