Nipples & Couplings
O Rings
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
O Rings
Millimetres Inner Diameter Tolerance + / -
Inches
Inner Diameter Tolerance + / -
Inner Diameter (mm)
Cross Section (mm)
Inner Diameter (inches)
Cross Section (inches)
AS568 Size Ref (Dash)
ISO3601 Size Ref
8.00 4.47 5.28 6.07 6.75 7.66 8.73 9.25
1.00
na
na
0.13 0.13
0.176 0.208
0.005 0.005
-008 -009
0.13 0.13
na
0.301
0.005
-011
0.13
0.364
0.005
-012
222 90.3585.00
$1 D
1.78 +/- 0.08
0.070 +/- 0.003
10.82 11.11 12.42 15.60 17.17 18.77 20.35 23.52 1.80 48.00
0.13 0.18 0.23 0.23 0.23 0.23
na
0.489 0.614 0.676 0.739 0.801
0.005 0.009 0.009 0.009 0.009
-014 -016 -017 -018 -019
.13
1.80 +/- 0.08
.0171
0.005
A0018
2.0 2.4 2.4 2.4
na na na
na na na
0.071 +/- 0.003
3.66
9.3
10.30
34.6
222 90.3871.00 222 90.3855.00
$2 D $1 D
23.47
6.02 7.59 9.19 9.93
0.13 0.13 0.13 0.13 0.13
0.237 0.299 0.362
0.005 0.005 0.005
-108 -109 -110
na
na
10.77
0.424
0.005
-111
12.37
.013
-112
13.10 15.08 17.12 17.13 17.86 17.96 20.24 20.29 56.82 67.95
0.13
85.309.103C 85.309.103V
na
na
2.62 +/- 0.08
0.103 +/- 0.003
0.23
0.674
0.009
-115
na
na
0.25 0.43
-117 -140
222 90.3913.00
$3 D
113.97 117.13 133.02
0.76
-157
222 90.3841.00 222 90.3922.00
$4 D
634
B.A.R. Group Pty Ltd - Price List 2024 November
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