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: 2322.52.8cm/98.91.1in Package Included 18 inch Hydraulic Three Jaw Chuck. 8 inch Hydraulic Three-Jaw Chuck Precise CNC Lathe Chuck 3 Pins Hydraulic Chuck. 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. Easy to Install: It can be installed quickly and without any tools, you can install it effortlessly. 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. Smooth Surface: Its smooth surface allows it to fit the lathe better and work more smoothly. User-friendly Design: It does not require discs or pads to hold the jaws, allowing through-hole machining of the jaws. 3 Pins: Its 3 independently adjustable pins fit into the countersunk holes of the soft jaws, allowing for even pressure on each pin and eliminating jaw lift. Precise Size: Every part of its size can precisely match the lathe, so you can install it smoothly. 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. The middle of the jaw trimmer has three screws, the three screws slide to the concentric position. 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. Let the chuck grip the jaw trimmer (the role is to remove the gap). Cutting and machining to the required size. Loosen the chuck and remove the jaw trimmer. If these steps are done correctly, the corrected raw jaws will be highly accurate. 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. Compatible Devices: Lathe(Not Included). Item Model Number: 3 Jaw. Material: 42crmo Alloy Steel. Process: High-temperature Quenching and Tempering, CNC High-precision Machining, Grinding, Blackening Treatment. Precision of Claw Trimmer Body: 0.005. Gross Weight: 2.4kg/5.3lbs. Inner Diameter: 115mm/4.5in. Package Size: 2322.52.8cm/98.91.1in. 18 inch Hydraulic Three Jaw Chuck. 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. 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. Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it’s non-workdays, please kindly be patient and wait till Monday.