Specification Brand : Martin BulletPoint1 : For use with series 40 chain, 1/2” pitch for driver or driven sprocket needs BulletPoint2 : Type BS sprocket with two setscrews and a keyway offers a stable and secure attachment to the shaft BulletPoint3 : Shaft diameter size from 1/2” to 1-1/2” for a variety of applications BulletPoint4 : Varying numbers of teeth, hub sizes, and stock bore sizes offer application flexibility BulletPoint5 : High carbon steel for strength and durability ExternallyAssignedProductIdentifier1 : 697950003627 ExternallyAssignedProductIdentifier2 : 0697950003627 ItemName : Martin Roller Chain Sprocket, Bored-to-Size, Type B Hub, Single Strand, 40 Chain Size, 0.5" Pitch, 11 Teeth, 0.75" Bore Dia., 2.003" OD, 1.375" Hub Dia., 0.284" Width ItemPackageDimensions_Height : 2.54 centimeters ItemPackageDimensions_Length : 6.604 centimeters ItemPackageDimensions_Width : 6.858 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : roller-chain-sprockets Manufacturer : MARTIN Material : Carbon Steel NumberOfItems : 1 NumberOfRows : 1 NumberOfTeeth : 11 PartNumber : 40BS11 3/4 ProductSiteLaunchDate : 2010-10-01T08:00:01.000Z Size : 40 Style : Bored-to-Size