TOP-TOOL Professional 3-Jaw Self-Centering Lathe Chuck, 125mm/5-inch, Cast Iron Construction, 2-80mm Clamping Range with Internal External Jaws and T-Key

Professional 125mm / 5-Inch 3-Jaw Self-Centering Lathe Chuck

The TOP-TOOL Professional 125mm (5-inch) chuck bridges the gap between hobby and light-industrial turning. HT300 Cast Iron construction with AISI 5140 alloy steel scroll handles medium-duty cuts with precision and stability.

Premium Materials & Hardening

Key Features

• HT300 Cast Iron Body: Superior rigidity and vibration damping for medium lathes. Reduces chatter during heavy facing and turning.
• Hardened Scroll & Gears: AISI 5140 alloy steel scroll (HRC 43-48) and bevel gears (HRC 45-50) for smooth, precise operation.
• Hardened Jaws (HRC 52-58): AISI 1045 carbon steel jaws through-hardened for maximum grip strength.
• Guaranteed Precision: Every chuck tested with 4 different diameter test bars. Repeatability ≤0.05mm (0.002").
• Plain Back Mount: 3× M8 mounting pattern. Important: Requires an adapter plate matched to your lathe spindle.
• Includes External & Internal Jaws: Supplied with both external jaws (5–95mm) and internal jaws.
• T-Key Included: Secure tightening. Remove before running.

Technical Specifications

Error-Free Jaw Installation

Numbered jaws (1, 2, 3) match the chuck body slots for quick, accurate installation. Prevents misalignment and ensures optimal concentricity.

Versatile Applications

• Lathe: General turning, facing, drilling, boring
• Milling Machine: Workpiece holding for milling
• Drilling Machine: Precision drilling setups
• CNC Machine: Light CNC turning and production

Compatibility Guide

Designed for medium benchtop lathes.
Sizing Rule: Lathe swing diameter > Chuck diameter (125mm). For safe operation with jaw overhang, a swing of ≥160mm is recommended.

Maintenance

Keep the scroll clean. Lubricate with Molybdenum Disulfide (MoS2) grease periodically. Store in a dry environment.