Mil-Spec O-Rings
Our Government Cage Code is: 10464
Quality Assurance per: MIL-I-45208A
Packaging per MIL-P-4861 available per request
See Mil-spec Catalog
Military Specification O-Rings need only NSN (National Stock Number) or the Military specification Prefix, plus the AS568 dash number (size). No other description is needed to assure exact conformance to the specification. Certification and cure dates are automatically sent when required.
AN (army navy),
MS (military specification),
NAS (national aerospace standard)
AS (aerospace) numbers
Compounds are approved to nearly every military, aerospace, ASTM, SAE, automotive, petroleum industry and commercial specification. The most widely used specifications are the AN, M, MS and NAS specifications. This reference table is arranged by drawing number.
| Sealing | Recommended Temp. Range°F |
||||||||
| Drawing No. | Specifications | Static | Dynamic | Fluid | Low | High | Elastomer | Compound | Comments |
| AN 123951 thru AN 124050 |
AMS 7270 | x | x | Aircraft fuels | -40 | +302 | Nitrile | 4456-70 | For use in aircraft fuels, both piston (gasoline) and jet (jet fuels) engines. |
| M25988/1 | MIL-R-25988 Class 1, Grade 70 |
x | x | Aircraft fuels and lubricants |
-70 | +392 | Fluorosilicone | 1903-70 | Blue color as required by MIL spec.Not recommended for high pressure dynamic applications. |
| M25988/2 | MIL-R-25988 Class 3, Grade 75 |
x | x | Aircraft fuels and lubricants |
-70 | +437 | Fluorosilicone | 1904-75 | Blue color as required by MIL spec. Higher modulus and higher temperature resistance than 1903-70. |
| M25988/3 | MIL-R-25988 Class 1, Grade 60 |
x | x | Aircraft fuels and lubricants |
-70 | +392 | Fluorosilicone | 1902-60 | Blue color as required by MIL spec. Lower durometer than 1903-70. For low pressure applications. |
| M25988/4 | MIL-R-25988 Class 1, Grade 80 |
x | x | Aircraft fuels and lubricants |
-70 | +392 | Fluorosilicone | 1905-80 | Blue color as required by MIL spec. Higher durometer than 1903-70. |
| M83248/1 | MIL-R-83248 Class 1 |
x | x | Aircraft fuels and lubricants |
-20 | +400 | Fluorocarbon | 9009-75 | Excellent resistance to compression set. |
| M83248/2 | MIL-R-83248 Class 2 |
x | x | Aircraft fuels and lubricants |
-20 | +400 | Fluorocarbon | 9009-90 | Higher durometer than 9009-75. |
| M83461/1A | MIL-P-83461 | x | x | MIL-H-5606 | -65 | +275 | Nitrile | 4367-70 | Better dynamic performance and longer service life at 257°F than 4067-70. |
| AS3578 | AMS 7271 | x | Aircraft fuels | -58 | +257 | Nitrile | 4465-65 | This drawing cover tube fitting sizes only. | |
| AS3578 | x | x | Aircraft fuels | -58 | +257 | Nitrile | 4465-65 | Not recommended for high pressure dynamic applications. | |
| AS3582 | AMS 3304 | x | x | Dry heat and petroleum based lube oils |
-85 | +400 | Silicone | 1235-70 | Not recommended for high pressure dynamic applications. |
| MS9385 | AMS 7267 | x | Dry heat and petroleum based lube oils |
-85 | +500 | Silicone | 1373-70 | This drawing cover tube fitting sizes only. | |
| MS9386 | x | x | -85 | +500 | Silicone | 1373-70 | This drawing covers all sizes except the tube fitting sizes. | ||
| MS9387 | AMS 7278 | x | Aircraft fuels and lubricants |
-20 | +400 | Fluorocarbon | 9009-75 | This drawing cover tube fitting sizes only. | |
| MS28775 | MIL-P-25732 | x | x | MIL-H-5606 | -65 | +275 | Nitrile | 4067-70 | MIL-H-5606 is the petroleum base hydraulic fluid used in military aircraft (inactive for new designs. see M 83461/1A) |
| MS28900 | AMS 3209 | x | Ozone | -40 | +212 | Neoprene | 3110-70 | For weather resistant seals. (Non-standard sizes) | |
| MS29512 | MIL-P-5315 | x | Aircraft fuels | -65 | +158 | Nitrile | 0457-60 | This drawing cover tube fitting sizes only. | |
| MS29513 | x | x | Aircraft fuels | -65 | +158 | Nitrile | 0457-60 | This drawing covers all sizes except the tube fitting sizes. | |
| NAS617 | MIL-R-7362, Type 1 |
x | x | Synthetic diester jet engine lubricants (MIL-L-7808) |
-65 | +257 | Nitrile | 4043-70 | This drawing cover tube fitting sizes only. |
| NAS1611 | NAS 1613, REV2 or REV4 |
x | x | Phosphate ester hydraulic fluid (Skydrol) |
-65 | +250 | Ethylene Propylene |
This drawing covers all sizes except tube fitting sizes. Inactive for new design. | |
| NAS1612 | NAS 1613, REV2 or REV4 |
x | -65 | +250 | Ethylene Propylene |
This drawing covers tube fitting sizes only. Inactive for new design. |