Specification Brand : Mr O-Ring BulletPoint1 : Contoured Backup Ring made of Buna-N (Nitrile, NBR) for use with a variety of fluids and hydrocarbons BulletPoint2 : Durometer (hardness) of 90A BulletPoint3 : For use across a wide temperature range from -40 degrees F (-40 degrees C) to 212 degrees F (100 degrees C) BulletPoint4 : Backup Rings provide added extrusion resistance in high pressure sealing situations BulletPoint5 : 1 or 2 Backup Rings can be used per 1 O-ring, depending on the direction of pressure in the sealing application Color : Black ItemName : 127 Buna-N Backup Ring, 90A Durometer, 1.456" ID, 0.086" Thick, Black (Pack of 50) ItemPackageDimensions_Height : 1.27 centimeters ItemPackageDimensions_Length : 9.906 centimeters ItemPackageDimensions_Width : 10.16 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : o-ring-seals Manufacturer : Small Parts Material : Buna-N ModelNumber : AZ-N8-90-127/50 NumberOfItems : 50 PartNumber : AZ-N8-90-127/50 Size : 127 Style : Pack of 50 UnitCount : 1 UnspscCode : 31410000