| AN Fitting O-Ring Reference Chart
The following chart outlines the proper O-ring sizes that should be used in “AN” O-ring Boss Fittings.
C&R Racing recommends the use of Buna-N (Nitrile) O-rings
for most cooling systems applications. For extreme temperature applications we suggest using Viton O-rings.
Upon installation always remember to lubricate the o-ring and check for damage.
AN Size |
Thread Size |
O-ring Size |
-3 |
3/8-24 |
2-011 |
-4 |
7/16-20 |
2-012 |
-6 |
7/16-20 |
2-013 |
-8 |
3/4-16 |
2-016 |
-10 |
7/8-14 |
2-115 |
-12 |
1 1/16-12 |
2-119 |
-16 |
1 5/16-12 |
2-122 |
-20 |
1 5/8-12 |
2-128 |
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