TOP-TOOL Professional 3-Jaw Self-Centering Lathe Chuck, 80mm/3-inch, Cast Iron Construction, 2-63mm Clamping Range with Internal External Jaws and T-Key

Professional 80mm / 3-Inch 3-Jaw Self-Centering Lathe Chuck

The TOP-TOOL Professional 80mm 3-Jaw Self-Centering Lathe Chuck is precision-engineered for mini lathes and small workshops. Built with a HT300 Cast Iron body and AISI 5140 alloy steel scroll, it delivers superior rigidity, vibration damping, and long-term accuracy for hobbyists and machinists alike.

Premium Materials & Hardening

Key Features

• HT300 Cast Iron Body: Higher-grade grey cast iron compared to standard HT200, providing superior rigidity and vibration damping for smoother cuts and better surface finishes.
• Hardened Scroll & Gears: AISI 5140 alloy steel scroll plate (HRC 43-48) and bevel gears (HRC 45-50) ensure smooth, precise jaw movement and long service life.
• Hardened Jaws (HRC 52-58): AISI 1045 carbon steel jaws are through-hardened for maximum grip strength and wear resistance.
• Guaranteed Precision: Every chuck is tested with standard test bars at 4 different diameters. Repeatability ≤0.05mm (0.002") guaranteed.
• Plain Back Mount: 3× M6 mounting holes. Note: Requires a separate adapter plate matched to your lathe spindle. Please verify your spindle type before ordering.
• Includes External & Internal Jaws: Supplied with both external jaws (2–55mm) and internal jaws for hollow workpiece gripping.
• T-Key Included: Heavy-duty T-handle key. Safety: Always remove the key before starting the lathe.

Technical Specifications

Error-Free Jaw Installation

Each jaw and the chuck body are marked with matching numbers (1, 2, 3). Simply align the numbered jaw with the corresponding slot on the chuck body to prevent misalignment and ensure accurate concentricity.

Versatile Applications

This chuck is compatible with multiple machine tools:

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

Compatibility Guide

This 80mm chuck is ideal for mini lathes and benchtop lathes.
Rule of Thumb: Choose a chuck where your lathe's swing diameter is larger than the chuck's outer diameter. Allow extra clearance for jaw overhang when gripping large workpieces. For an 80mm chuck, a lathe swing of ≥100mm is recommended.

Maintenance & Care

To ensure longevity and smooth operation:

• Clean chips and debris from the scroll and jaw slides regularly.
• Lubricate the scroll plate and bevel gears with Molybdenum Disulfide (MoS2) grease every few months. Avoid heavy oils that attract dust.
• Store in a dry environment to prevent rust on the precision-ground jaws.