Specification Brand : Generic BulletPoint : * Square drive 1/2" drive x 1" flats, this will fit all of your 40 taper retention knobs. *You can also open it with a wrench. * Made of high-grade tool steel S7 and heat treating (harden 60 Rc). *100% Satisfaction Guaranteed. BulletPoint1 : Bore Diameter: 3/16" BulletPoint2 : Projection Length: 3.0" BulletPoint3 : Nose Diameter: 0.875" BulletPoint4 : Drawbar Thread Size: 5/8x11 UNC BulletPoint5 : TIR (in): 0.0001, Max RPM Balanced to: G2.5 20,000 CompatibleFastenerDescription : 0.5 inch ConnectorType : Crimp CutType1 : Rounded CutType2 : Taper DriveSystem : Square ExternallyAssignedProductIdentifier1 : 0655498000096 ExternallyAssignedProductIdentifier2 : 655498000096 IncludedComponents : Hand Tapper ItemName : 1/2" Drive, Retention KNOB Socket FITS All 40 Taper (CAT40, BT40) Pull Stud Tool ItemPackageDimensions_Height : 6 inches ItemPackageDimensions_Length : 9 inches ItemPackageDimensions_Width : 1 inches ItemPackageQuantity : 10 ItemShape : Round ItemTypeKeyword : tool-holders Manufacturer : Sunnyvale CNC, Inc Material : Alloy Steel NumberOfBoxes : 1 NumberOfFlutes : 2 NumberOfItems : 1 NumberOfPieces : 1 PackageLevel : unit PartNumber : SNY-1 ProductDescription : Tool holder is balanced to G2.5 20,000 RPM on a HAIMER Tool Dynamic Balancing System from Germany. Balanced tool holder minimizes the centrifugal forces which minimize the stress on spindle bearing, minimize vibration and maximize the cutting tool's life cycle and greatly improve surface finish. Unique design feature in the flange to minimize the off-balance nature of CAT 40 taper specification. On the shoulder under the flange, a side is mill flat to compensate the weight of the metal chips lost from forming the spherical hole in the flange. This design allows the left side and right side of the holder to achieve 50-50 perfect weight distribution in its upright position, like the position inside a machine spindle. Symmetrical design in evenly weight distribution will minimize centrifugal force in high speed spinning and thus maximize the holder's ability to hold the cutting tool concentric to spindle rotation. To achieve AT3 or better taper contact as an industry standard, our taper surface are precision ground on Shigiya CNC grinder from Japan. We are not satisfied with just meeting the industry standard, the surface roughness on the taper is maintained to mirror finish. The maximum torque is laser marked on the ER collet nut face to take the guess game out of the way to ensure proper amount of force should be applied while tightening. Innovative coating process significantly increases the clamping force by 75% compared to standard ER collet nut. More gripping force provides better rigidity and reduces the possibility of losing grip on the round shank which lead to expensive damage on cutting tools and work piece material. ProductSiteLaunchDate : 2021-02-12T23:27:00.224Z Size : One Size SpecificationMet : RoHS Style : Standard SupplierDeclaredDgHzRegulation : unknown ToleranceHeld : Precision UnitCount : 1