Specification Brand : Coavoo BulletPoint1 : 2 Pack coupler coupling, the bore hole for the stepper servo motor shaft 5mm, for ball screw end 8mm, OD 30mm, total length 40mm, always with the ballscrew SFU1204 BulletPoint2 : The coupler dimensions is standard, we can make the size as your requirements for customization, including the bore diameter for the motor shaft, and the hole diameter for the ball screw; we also have other styles to choose about the OD and total length, please message us if you need BulletPoint3 : The shaft coupling has bigger outer diameter, so with higher torque, higher rigidity, good vibration resistance, flexible response and durability in removes stress between the motor and driving components BulletPoint4 : Shaft Coupler Material: Aluminum alloy, Surface oxidation treatment; Type: Plum shaped BulletPoint5 : Widely Used:The shaft couplers are widely used for stepper motor, servo motors, spindle as the cnc ball screw, lead screw parts for the 3d printer router engraving milling machine ExternallyAssignedProductIdentifier1 : 0758863254633 ExternallyAssignedProductIdentifier2 : 758863254633 FitType : Universal IncludedComponents : 1pcs coupling ItemName : Coavoo Pulm Flexible Coupling Coupler 5mm to 8mm 2PCS, Aluminum Flexible Jaw Spider Plum Coupling D30L40 Connector for 3D Printer CNC Machine and Stepped Servo Motor ItemPackageDimensions_Height : 6.8072 centimeters ItemPackageDimensions_Length : 3.4036 centimeters ItemPackageDimensions_Width : 4.8006 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : spider-couplings Manufacturer : Coavoo Material : Aluminum Material1 : Aluminum Material2 : Polyurethane MaximumRotationalSpeed : 5850 rpm MetalType : Aluminum ModelNumber : CO-2-LZQ-D30L40-D5D8 NumberOfItems : 2 NumberOfPieces : 2 PartNumber : CO-2-LZQ-D30L40-D5D8 ProductDescription : Brand: Coavoo The package includes: 2 Pack coupling / coupler ProductSiteLaunchDate : 2022-11-09T09:44:27.355Z Size : 2Pcs D30L40D5D8 Coupler StreetDate : 2017-11-25T00:00:01Z Style : Parts SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 UnspscCode : 31161700