Lathe Chuck 3 Jaws/4 Jaws Manual Self-Centering Mounting Bolt for Grinding Milling Turning Machine The self-centering lathe chuck is composed of a strong zinc alloy body and steel jaws, allowing it to withstand demanding working environments. It offers a wide clamping range and high accuracy, enabling you to securely hold a variety of materials. Features: The lathe chuck body is made of high-quality zinc alloy. The surface is precision ground with smooth edges. Efficiently grips the material from all directions simultaneously for secure clamping. The lathe chuck has a runout tolerance of ≤0.002 inch, operates with minimal vibration, and ensures precise finished parts. Easy jaw adjustment using the included chuck key. Quick installation saves time and increases productivity. The chuck includes both internal and external jaws. It offers a large clamping range, suitable for holding various industrial components. The manual self-centering chuck is compact and convenient, ideal for use with lathe machines, grinding machines, or milling machines. Specifications: Type: 3 jaws, 4 jaws (optional) Connecting shaft: 3.17mm, 5mm, 8mm (optional) Material: Zinc alloy + stainless steel Chuck thread diameter: 12mm Chuck thread pitch: 1mm Chuck diameter: approx. 50mm / 2.0in Package size: 90 x 70 x 45mm / 3.5 x 2.8 x 1.8in Package weight: 226g / 8.0oz Packing List: 1 x Chuck 1 x Connecting Shaft 2 x Screws 1 x Wrench for Chuck 1 x Wrench for Connecting Shaft Screws