Specification Brand : Martin BulletPoint1 : For use with Martin Spacer Coupling (SC) type Quadra-Flex series flexible coupling assemblies (sold separately) BulletPoint2 : High carbon steel for better wear and longer life over hubs made from steel alloys with less or no carbon, or non-steel alloys BulletPoint3 : Low friction for lubrication-free operation BulletPoint4 : Attaches to SC type spacer flanges with four bolts ExternallyAssignedProductIdentifier1 : 697950276427 ExternallyAssignedProductIdentifier2 : 0697950276427 ItemName : Martin 5H PB Quadraflex Spacer Coupling, High Carbon Steel, Inch, 0.5" Bore A, 0.5" Bore B, 2" OD, 1.094" Length ItemPackageDimensions_Height : 3.81 centimeters ItemPackageDimensions_Length : 5.334 centimeters ItemPackageDimensions_Width : 5.588 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : roller-chain-couplings Manufacturer : MARTIN Material : Carbon Steel MaximumAngularMisalignment : 0.33 degrees MaximumRotationalSpeed : 7600 rpm NumberOfItems : 1 PartNumber : 5H PB ProductSiteLaunchDate : 2010-11-10T08:00:01.000Z Size : 0.5 inches StreetDate : 2017-05-15T00:00:01Z Style : Modern