4-Jaw Lathe Chuck, 8 Inch (200 Mm), Self-Centering Chuck With 1 1/2 In-8 Threaded Backing Plate, 0.16-7.87 In (4-200 Mm) Clamping Range With T-Wrench Screws, HT300 Material, For Wood Metal Lathe

About these items Crafted from robust HT300 cast iron, each chuck body and jaw set undergoes quench-hardening to deliver excellent rigidity and exceptional surface durability. Jaw hardness reaches ≥53 HRC while the scroll plate achieves ≥45 HRC, supporting stable clamping through repeated use without deformation. This durable build resists wear and oxidation during extended machining, helping maintain smooth rotation, consistent gripping force, and reliable accuracy across varied cutting conditions and continuous shop workloads. The built-in self-centering mechanism ensures that the jaws move simultaneously to position workpieces accurately without repeated adjustments. This synchronized motion provides consistent concentricity, reducing set-up time and lowering the chance of alignment errors. Whether preparing cylindrical stock, gripping irregular sections, or securing delicate materials, the mechanism promotes dependable accuracy and steadiness, allowing users to achieve cleaner surfaces, predictable tool contact, and repeatable machining passes with minimal effort. Available in 6' and 8' diameters with 3-jaw, 4-jaw, or 6-jaw configurations, these chucks accommodate a wide span of inner and outer clamping ranges suited for numerous machining needs. Workpieces from 0.12' to 7.87' can be securely gripped depending on the model, allowing operators to switch between small components and larger assemblies without changing fixtures. This adaptability enhances flexibility in metal shaping, drilling, or milling and supports efficient handling of smooth, square, or uneven stock with consistent holding stability. Models come equipped with threaded backing plates (1-1/2-8 or 2-1/4-8) or a smooth D1-4 cam-lock system, enabling quick, firm, and repeatable attachment to compatible machines. Each mounting option promotes secure engagement that minimizes runout and vibration, supporting smooth motion even at higher spindle speeds. The included T-wrench simplifies daily operation, allowing swift jaw adjustments and easy installation so users can focus on productive machining rather than lengthy set-ups. Designed to support precise clamping in metal shaping, drilling, or milling operations, each chuck contributes to consistent geometry and dependable feed control. The balanced construction and stable engagement help reduce chatter and improve finish quality across many applications. Whether shaping small components or preparing larger assemblies, the chuck maintains accurate centering and strong grip strength, helping users achieve efficient workflow, reproducible tolerances, and professional machining outcomes. Key Differences The 6' 3-jaw chuck offers a compact design with a 1-1/2-8 threaded plate and a wide internal grip range suited for medium projects, while the 8' 3-jaw version expands capacity through a larger 2-1/4-8 mount and extended workpiece range. The 8' 4-jaw model adds improved adaptability for gripping square or irregular shapes while maintaining the same outer diameter. The 6' 6-jaw chuck enhances support for delicate or thin-walled components by distributing pressure more evenly and mounts via a smooth-action D1-4 cam-lock for quicker fastening. Specifications 6' 3-Jaw (K11 160A 1-1/2-8) Inner diameter: 1.77' Outer diameter: 6' Internal clamping range: 0.12-5.71' External clamping range: 1.97-6.3' Material: HT300 Net weight: 22.05 lb Dimensions: φ6.3 x 4.33' 8' 3-Jaw (K11 200A 2-1/4-8) Inner diameter: 2.56' Outer diameter: 8' Internal clamping range: 0.16-7.87' External clamping range: 2.56-7.87' Material: HT300 Net weight: 35.38 lb Dimensions: φ7.87 x 4.92' 8' 4-Jaw (K12 200 1-1/2-8) Inner diameter: 2.56' Outer diameter: 8' Internal clamping range: 0.16-7.87' External clamping range: 2.56-7.87' Material: HT300 Net weight: 41.23 lb Dimensions: φ7.87 x 4.33' 6' 6-Jaw (K13-160A D1-4) Inner diameter: 1.57' Outer diameter: 6' Internal clamping range: 0.12-5.71' External clamping range: 1.97-6.3' Material: HT300 Net weight: 24.47 lb Dimensions: φ6.3 x 4.53' Package Contents 1 x Lathe Chuck 1 x T-Wrench