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 BulletPoint5 : Box of 6 ExteriorFinish : Zinc ExternallyAssignedProductIdentifier1 : 697950277462 ExternallyAssignedProductIdentifier2 : 0697950277462 ItemName : Martin 8H PB Quadraflex Spacer Coupling, High Carbon Steel, Inch, 3.25" OD, 1.719" Length ItemPackageDimensions_Height : 5.08 centimeters ItemPackageDimensions_Length : 9.906 centimeters ItemPackageDimensions_Width : 10.414 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : roller-chain-couplings Manufacturer : MARTIN Material : Carbon Steel MaximumAngularMisalignment : 0.33 degrees MaximumRotationalSpeed : 4500 rpm MeasurementSystem : Standard NumberOfItems : 1 NumberOfPieces : 8 PartNumber : 8H PB ProductDescription : No. 50 Roller Chain Connecting Link ProductSiteLaunchDate : 2010-11-10T08:00:01.000Z Size : One Size StreetDate : 2017-11-25T00:00:01Z Style : Modern