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About O-Rings
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Oil-Resistant Mil. Spec. Buna-N O-Rings
Choose these O-rings for their adherence to strict military standards for material and construction. Made of Buna-N, they stand up to a variety of oils and fuels as well as ammonia, ethylene glycol, and isopropyl alcohol. They’re also resilient and tear resistant. These O-rings are made in the U.S.
O-rings that meet MIL-I-45208 have undergone rigorous inspection for quality control.
Fractional | Actual | Pkg. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number  | ID | OD | ID | OD | Hardness | Specifications Met | Temp. Range, °F | Color | Pkg. Qty. | 1-9 | 10-Up | |
Wd.: 1/32 Fractional (0.04" Actual) | ||||||||||||
| 001 | 1/32 | 3/32 | 0.029" | 0.109" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 000000 | 000000 |
Wd.: 3/64 Fractional (0.05" Actual) | ||||||||||||
| 002 | 3/64 | 9/64 | 0.042" | 0.142" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
Wd.: 1/16 Fractional (0.06" Actual) | ||||||||||||
| 003 | 1/16 | 3/16 | 0.056" | 0.176" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
Wd.: 1/16 Fractional (0.07" Actual) | ||||||||||||
| 004 | 5/64 | 13/64 | 0.07" | 0.21" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 005 | 3/32 | 7/32 | 0.101" | 0.241" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 006 | 1/8 | 1/4 | 0.114" | 0.254" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 007 | 5/32 | 9/32 | 0.145" | 0.285" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 008 | 3/16 | 5/16 | 0.176" | 0.316" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 009 | 7/32 | 11/32 | 0.208" | 0.348" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 010 | 1/4 | 3/8 | 0.239" | 0.379" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 011 | 5/16 | 7/16 | 0.301" | 0.441" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 012 | 3/8 | 1/2 | 0.364" | 0.504" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 013 | 7/16 | 9/16 | 0.426" | 0.566" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 014 | 1/2 | 5/8 | 0.489" | 0.629" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 015 | 9/16 | 11/16 | 0.551" | 0.691" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 016 | 5/8 | 3/4 | 0.614" | 0.754" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 017 | 11/16 | 13/16 | 0.676" | 0.816" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 018 | 3/4 | 7/8 | 0.739" | 0.879" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 019 | 13/16 | 15/16 | 0.801" | 0.941" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 020 | 7/8 | 1 | 0.864" | 1.004" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 0000000 | 00000 | 00000 |
| 021 | 15/16 | 1 1/16 | 0.926" | 1.066" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 022 | 1 | 1 1/8 | 0.989" | 1.129" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 023 | 1 1/16 | 1 3/16 | 1.051" | 1.191" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 024 | 1 1/8 | 1 1/4 | 1.114" | 1.254" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 025 | 1 3/16 | 1 5/16 | 1.176" | 1.316" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 026 | 1 1/4 | 1 3/8 | 1.239" | 1.379" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 027 | 1 5/16 | 1 7/16 | 1.301" | 1.441" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 028 | 1 3/8 | 1 1/2 | 1.364" | 1.504" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 029 | 1 1/2 | 1 5/8 | 1.489" | 1.629" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 030 | 1 5/8 | 1 3/4 | 1.614" | 1.754" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 031 | 1 3/4 | 1 7/8 | 1.739" | 1.879" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 032 | 1 7/8 | 2 | 1.864" | 2.004" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 033 | 2 | 2 1/8 | 1.989" | 2.129" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 035 | 2 1/4 | 2 3/8 | 2.239" | 2.379" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 036 | 2 3/8 | 2 1/2 | 2.364" | 2.504" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 037 | 2 1/2 | 2 5/8 | 2.489" | 2.629" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 038 | 2 5/8 | 2 3/4 | 2.614" | 2.754" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 039 | 2 3/4 | 2 7/8 | 2.739" | 2.879" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 040 | 2 7/8 | 3 | 2.864" | 3.004" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 0000000 | 00000 | 00000 |
| 041 | 3 | 3 1/8 | 2.989" | 3.129" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 5 | 00000000 | 00000 | 00000 |
| 042 | 3 1/4 | 3 3/8 | 3.239" | 3.379" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 5 | 00000000 | 00000 | 00000 |
| 043 | 3 1/2 | 3 5/8 | 3.489" | 3.629" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 5 | 00000000 | 00000 | 00000 |
| 044 | 3 3/4 | 3 7/8 | 3.739" | 3.879" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 5 | 00000000 | 00000 | 00000 |
| 045 | 4 | 4 1/8 | 3.989" | 4.129" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 1 | 00000000 | 0000 | 0000 |
| 049 | 5 | 5 1/8 | 4.989" | 5.129" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 2 | 00000000 | 00000 | 00000 |
| 050 | 5 1/4 | 5 3/8 | 5.239" | 5.379" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 2 | 0000000 | 00000 | 00000 |
Wd.: 3/32 Fractional (0.103" Actual) | ||||||||||||
| 104 | 1/8 | 5/16 | 0.112" | 0.318" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 107 | 7/32 | 13/32 | 0.206" | 0.412" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 108 | 1/4 | 7/16 | 0.237" | 0.443" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 109 | 5/16 | 1/2 | 0.299" | 0.505" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 110 | 3/8 | 9/16 | 0.362" | 0.568" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 111 | 7/16 | 5/8 | 0.424" | 0.63" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 112 | 1/2 | 11/16 | 0.487" | 0.693" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 113 | 9/16 | 3/4 | 0.549" | 0.755" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 114 | 5/8 | 13/16 | 0.612" | 0.818" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 115 | 11/16 | 7/8 | 0.674" | 0.88" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 116 | 3/4 | 15/16 | 0.737" | 0.943" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 117 | 13/16 | 1 | 0.799" | 1.005" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 118 | 7/8 | 1 1/16 | 0.862" | 1.068" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 119 | 15/16 | 1 1/8 | 0.924" | 1.13" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 120 | 1 | 1 3/16 | 0.987" | 1.193" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 121 | 1 1/16 | 1 1/4 | 1.049" | 1.255" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 0000000 | 00000 | 00000 |
| 122 | 1 1/8 | 1 5/16 | 1.112" | 1.318" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 123 | 1 3/16 | 1 3/8 | 1.174" | 1.38" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 25 | 00000000 | 00000 | 00000 |
| 125 | 1 5/16 | 1 1/2 | 1.299" | 1.505" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 126 | 1 3/8 | 1 9/16 | 1.362" | 1.568" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 127 | 1 7/16 | 1 5/8 | 1.424" | 1.63" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 128 | 1 1/2 | 1 11/16 | 1.487" | 1.693" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 129 | 1 9/16 | 1 3/4 | 1.549" | 1.755" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 130 | 1 5/8 | 1 13/16 | 1.612" | 1.818" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 131 | 1 11/16 | 1 7/8 | 1.674" | 1.88" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 132 | 1 3/4 | 1 15/16 | 1.737" | 1.943" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 133 | 1 13/16 | 2 | 1.799" | 2.005" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 134 | 1 7/8 | 2 1/16 | 1.862" | 2.068" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 135 | 1 15/16 | 2 1/8 | 1.925" | 2.131" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 136 | 2 | 2 3/16 | 1.987" | 2.193" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 137 | 2 1/16 | 2 1/4 | 2.05" | 2.256" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 138 | 2 1/8 | 2 5/16 | 2.112" | 2.318" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 139 | 2 3/16 | 2 3/8 | 2.175" | 2.381" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 140 | 2 1/4 | 2 7/16 | 2.237" | 2.443" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 141 | 2 5/16 | 2 1/2 | 2.3" | 2.506" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 0000000 | 00000 | 00000 |
| 142 | 2 3/8 | 2 9/16 | 2.362" | 2.568" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |
| 143 | 2 7/16 | 2 5/8 | 2.425" | 2.631" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 10 | 00000000 | 00000 | 00000 |