Military and Aerospace Approved O-Rings

At Marco Rubber & Plastics, we provide a wide variety of compounds approved to nearly every military, aerospace, ASTM, SAE, automotive, petroleum industry and commercial specification. Many products are in stock and available to buy online. We stock many popular sizes of Mil-Specs Parts from QPL Manufacturers. Packaging per Mil-P-4861 is available upon request.

Of these specifications, the most widely used are AMS, AS, AN, M, MS, MIL, and NAS specifications. This reference table lists some of the specs available.

Mil-Spec Compounds

Material Specification Sizing Specification Base Material High Temp °F (°C) Low Temp °F (°C) Superseded Size Spec Superseded Material Spec

MIL-H-5606 petroleum base hydraulic fluid for military aircraft (inactive for new designs. see AMS-P-83461)

MS28784, MS28785 MIL-P-25732, AN6227, AN6230 M83461/1, M83461/2

MIL-H-5606 Better dynamic performance and longer service life at 257°F than AMS-P-25732 (MS28775). M83461/1, M83461/2 Boss Tube Sizes

MS29513 , MS29512 MS29513 , MS29512 Boss Tube Sizes, Aircraft fuels MIL-P-5510, AN6231, AN6290 Tube fitting sizes only. Not recommended for high pressure dynamic applications, Aircraft fuels MS9020, MS9021 For use in aircraft fuels, both piston (gasoline) and jet (jet fuels) engines. AN123951, AN124050 MIL-R-7362, NAS61 MIL-R-2765D GR-40 MIL-G-21569 Class 1 General Purpose MIL-R-3065 GR-70 AMS-R-6855 CL-1 GR-80 AS3209, AS3208 AS3209, AS3208 Boss Tube Sizes, Aircraft fuels and lubricant compression set resistance

M83248/1, MS9387, MS9388, AS3084, AS3085, NAS1593, NAS1595, MA3352, AS17413, MS17413, AS43013, AS43003

AMS-R-83248 Class 1, MIL-R-83248 Class 1, AMS7278, AMS7280, DTD5613 Grade 80 High durometer, Aircraft fuels and lubricants M83248/2, MS9970 Low Temp GLT, Aerospace M83485/1, MA3445 AMS-R-83485, MIL-R-83485 Lowest Temp FKM -40, Aerospace High temp resistant and extreme chemical resistance, Aerospace NAS1612, NAS1611 NAS 1613 Rev 2 NAS1612, NAS1611 Boss Tube Sizes.Inactive for new design Phosphate ester hydraulic fluid (Skydrol) NAS1602, NAS1601 NAS1612, NAS1611 NAS 1613 Rev 5 NAS1612, NAS1611 Boss Tube Sizes. Phosphate ester hydraulic fluid (Skydrol) MIL-G-22050 GR-1 MIL-G-22050 GR-3 For ozone and weather resistant seals. (Non-standard sizes) AMS-R-6855 CL-2 GR-60 AMS-R-6855 CL-2 GR-70 AMS-R-25988 Class 1, Grade 70 AMS-R-25988/1 Fluorosilicone Blue color as required by MIL spec, Aircraft fuels and lubricants MIL-R-25988 Class 1, Grade 70, MIL-DTL-25988 Class 1, Grade 70 AMS-R-25988 Class 3, Grade 75 AMS-R-25988/2 Fluorosilicone Blue color as required by MIL spec, Aircraft fuels and lubricants MIL-R-25988 Class 3, Grade 75, MIL-DTL-25988 Class 1, Grade 75 AMS-R-25988 Class 3, Grade 60 AMS-R-25988/3 Fluorosilicone Blue color as required by MIL spec, Aircraft fuels and lubricants MIL-R-25988 Class 3, Grade 60, MIL-DTL-25988 Class 1, Grade 60 AMS-R-25988 Class 3, Grade 80 AMS-R-25988/4 Fluorosilicone Blue color as required by MIL spec, Aircraft fuels and lubricants MIL-R-25988 Class 3, Grade 80, MIL-DTL-25988 Class 1, Grade 80 AS9967, AS9966 Fluorosilicone AS9967, AS9966 Boss Tube Sizes, Aircraft fuels and lubricants MS9967, MS9966 Not recommended for high pressure dynamic applications, Dry heat and petroleum based lube oils MIL-G-21569 Class 2 Higher Temp and oil resistance Lower Temp ZZ-R-765 (1A-70) A-A-59588 (1A-70) Lower Temp ZZ-R-765 (1A-70) A-A-59588 (1A-60) Lower Temp ZZ-R-765 (1A-60) A-A-59588 (1A-50) Lower Temp ZZ-R-765 (1A-50) A-A-59588 (1B-70) Lower Temp ZZ-R-765E (1B-70) A-A-59588 (2A-60) Higher Temp ZZ-R-765 (1A-60) A-A-59588 (2B-80) Higher Temp ZZ-R-765 (2B-80) A-A-59588 (2B-70) Higher Temp ZZ-R-765 (2B-70) A-A-59588 (2B-60) Higher Temp ZZ-R-765 (2B-60) A-A-59588 (2B-50) Higher Temp ZZ-R-765 (2B-50) A-A-55549 (2A 2B 50) Higher Temp ZZ-R-765 (2A 2B 50) A-A-59588 (2B-40) Higher Temp ZZ-R-765 (2B-40) A-A-59588 (40) A-A-59588 (3B-70) Higher Temp ZZ-R-765E (3B-70)

The information on this page is to the best of our knowledge accurate and reliable. However, Marco Rubber makes no warranty, expressed or implied, that parts manufactured from this material will perform satisfactorily in the customer's application. It's the customer's responsibility to evaluate parts prior to use.

The temperature ranges presented on this page are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.

Other Mil-Spec Materials Available by Request

Material Specification Sizing Specification AS43013, AS43003 AS43013, AS43003 Boss Tube Sizes Aircraft fuels and lubricants Blue color as required by MIL spec, Aircraft fuels and lubricants AS9386, AS9385 AS9386, AS9385 Boss Tube Sizes, Dry heat and petroleum based lube oils Medium Closed Cell Silicone Rubber Sponge Firm Closed Cell Silicone Rubber Sponge Soft Chloroprene-Rubber Sponge Medium Chloroprene Type Synthetic Rubber Sponge Firm Chloroprene Type Synthetic Rubber Sponge AMS 3200 (B) Petroleum-Base Hydraulic Fluid Resistant Nitrile Rubber 55-65 Durometer AMS 3201 (B) Dry Heat Resistant Synthetic Rubber 35-45 Durometer AMS 3202 (B) Dry Heat Resistant Synthetic Rubber 55-65 Durometer AMS 3204 (B) Low Temperature Resistant Synthetic Rubber 25-35 Durometer AMS 3205 (B) Low Temperature Resistant Synthetic Rubber 45-55 Durometer Extreme Pressure Lubricant Resistant Synthetic Rubber 65-75 Durometer AMS 3207 (B) Weather Resistant Chloroprene Rubber 25-35 Durometer AMS 3208 (B) Weather Resistant Chloroprene Type Synthetic Rubber 45-55 Durometer AMS 3209 (B) Weather Resistant Chloroprene Type Synthetic Rubber 65-75 Durometer

Preformed Packing. 70-80 durometer, high temperature, fluid resistant, low compression FKM per AMS7276.