Magnum 5 Inch 3-Jaw Plain Back Self-Centering Lathe Chuck (C3J5PB)
Achieve increased clamping surface area for larger diameter workpieces and provide a robust solution for general-purpose turning. The 5" plain back design allows for precise concentricity adjustments during the initial backplate fitting, ensuring minimal runout for high-speed machining. This self-centering chuck simplifies setup by moving all jaws simultaneously to lock onto round or hexagonal stock.
Features
- Industrial Grade Casting - High-mass body provides the rigidity required for heavy material removal.
- Self-Centering Jaws - Internal scroll gear moves all 3 jaws at once for rapid setup.
- Plain Back Mounting - Universal design requires a custom backplate to fit your specific lathe spindle.
Specifications
- Diameter: 5" (127 mm)
- Number of Jaws: 3-Jaw
- Mounting Type: Plain Back
- Supplier Part Number: C3J5PB
- KMS Product Code: MAG-C3J5PB
Common Shop Applications
- Holding round or hexagonal stock for standard lathe turning.
- Adapting specialized or older lathes with non-standard spindle noses.
- Precision machining where minimal runout is critical after backplate truing.
Includes
- (1) 5" 3-Jaw Plain Back Chuck
- (1) Set of External Jaws
- (1) Set of Internal Jaws
- (1) Chuck Key
- (1) Set of Mounting Bolts
Recommended Shop Add-Ons
- Don't forget: Semi-Finished Backplate - Required to mount this plain back chuck to your specific spindle nose.
- Most machinists also grab: Dial Indicator - Essential for dialing in the chuck concentricity during installation.
Frequently Asked Questions
Q: What does "Plain Back" mean for mounting? A: Plain back chucks do not have a pre-machined thread or taper. They must be bolted to a backplate that you turn to fit your specific lathe spindle.
Q: Can this chuck be used for eccentric turning? A: No, a 3-jaw self-centering chuck moves all jaws together. For eccentric or off-center work, a 4-jaw independent chuck is required.