【BUILD TO LAST】: It is made of ultra-high strength 42CrMo steel with high strength and high toughness, combined with high temperature quenching and tempering, giving it high hardness (45-50 degrees), extending service life and reducing maintenance. 【IMPROVED PRECISION】: It will not produce bell mouth shape and centrifugal vibration, and has better control for the hydraulic raw jaws forming ring for high precision(0.005). 【MULTIPLE ADAPTABILITY】: Both external and internal jaws can be used. The hydraulic claw can be adjusted according to the required size, making it easy and efficient to operate, and meet your various needs while saving time and effort. 【POWERFUL FUNCTION】: By using the forming ring, the accuracy and gripping force of the old-type chuck can be effectively improved, making it ideal for CNC lathes, CNC power chucks, and manual chucks in soft jaw machining to give you better concentricity and a truer soft jaw bore. 【EASY TO INSTALL】: It can be installed quickly and without any tools, you can install it effortlessly. Description Give you better concentricity and a truer soft jaw bore with this 8-inch hydraulic three-jaw chuck. It is made of high-quality hardened 42crmo alloy steel and is available in both internal and external jaws without flare and centrifugal vibration, giving better control over the chuck to improve the machining accuracy of the chuck. Application It is suitable for machine tools and accessories such as ordinary lathes, economical CNC lathes, grinding machines, milling machines, drilling machines and machine tool accessories. Specification Color: Black Compatible Devices: Lathe(Not Included) Included Components: 1 Item Model Number: 3 Jaw Material: 42crmo Alloy Steel Process: High-temperature Quenching and Tempering, CNC High-precision Machining, Grinding, Blackening Treatment Hardness: 45-55HRC Precision of Claw Trimmer Body: 0.005 Gross Weight: 2.4kg/5.3lbs Inner Diameter: 115mm/4.5in Outer Diameter: 218mm/8in Package Size: 23*22.5*2.8cm/9*8.9*1.1in Package Included 1*8 inch Hydraulic Three Jaw Chuck Installation 1.First put the chuck on the lathe (not included), then fix the raw jaws in the correct position of the chuck to clamp the workpiece (not included), move the T-block in the middle of the jaws (not included), the T-block (not included) cannot exceed the outer edge of the chuck. 2. The middle of the jaw trimmer has three screws, the three screws slide to the concentric position. 3.The two screws of the jaw trimmer at the same time set into the inner hole of the chuck, and then move the claw to the three screw holes, while stuck to the raw claw between. 4.Let the chuck grip the jaw trimmer (the role is to remove the gap). 5.Cutting and machining to the required size. 6.Loosen the chuck and remove the jaw trimmer. 7.If these steps are done correctly, the corrected raw jaws will be highly accurate. Notes 1.Please adjust the pressure to less than 1 MPa (0.3-0.5 suitable) and the speed to less than 800 rpm. And it should be fixed before repair, please do not move the product after repair. 2.Please allow the slight color difference caused by the shooting light and 1-3cm error due to manual measurement, and make sure you do not mind before ordering.