Form: This specification covers a butadiene-acrylonitrile (NBR) rubber in tTie??form of molded rings. Application: Sealing rings for use at temperatures as low as -55??(-65??@ where resistance to hot petroleum-base lubricating oil is required. The cross-section of such rings is usually not over 0.275 in. (7.0 mm) in diameter or thickness. Standard sizes are as shown in AS 568.
SAE AMS7274G-1986 history
2020SAE AMS7274K-2020 Rubber: Acrylonitrile-Butadiene (NBR) Engine Oil Resistance, 65 to 75 Hardness, for Seals in Aircraft Engine Oil Systems
2014SAE AMS7274J-2014 Rubber, Butadiene-Acrylonitrile (NBR), 65 to 75 Hardness, For Elastomeric Seals in Aircraft Engine Oil Systems