Value Collection 429-4003 3 Inch 4 Jaw Lathe Chuck

Product Description

The VALUE COLLECTION 429-4003 is a 3-inch, 4-jaw independent manual lathe chuck with a plain back mount, built for precision workholding on metal lathes. Constructed from cast iron, this chuck provides the rigidity needed to hold irregularly shaped or non-concentric workpieces. Each jaw adjusts independently, allowing operators to precisely center stock that a self-centering chuck cannot grip accurately. The through-hole diameter measures 0.8661 inches (22 mm), accommodating bar stock fed through the spindle. Two sets of hard solid one-piece jaws are included. Machinists and toolroom technicians rely on this type of chuck for custom setups, off-center turning, and second-operation work.

This chuck is suited for manual lathe applications in machine shops, maintenance facilities, and toolrooms where independent jaw control is required. The plain back mount design means the chuck is intended to be fitted to a lathe backplate matched to the spindle nose of the target machine. It is appropriate for both production and job-shop environments handling ferrous and non-ferrous workpieces that require deliberate, individual jaw positioning. The body length of 1-21/32 inches keeps the chuck compact relative to its 3-inch diameter, reducing overhang and improving rigidity during cuts.

Key Features

• 4 independently adjustable jaws for precise centering of irregular or non-concentric workpieces
• 3-inch (80 mm) chuck diameter in a compact cast iron body
• Plain back mount for fitment to a custom or machine-specific backplate
• Through-hole diameter of 0.8661 inches (22 mm) for bar stock pass-through
• Includes two sets of hard solid one-piece, non-reversible jaws
• Body length of 1-21/32 inches for reduced spindle overhang

Compatibility

Designed as an OEM-style plain back mount lathe chuck intended for fitment to a machinist-supplied or machine-specific backplate; confirm spindle nose type and backplate bore before installation.

Installation Notes

Installation of a plain back lathe chuck requires a backplate bored and threaded to match the lathe spindle nose; this work is typically performed by a qualified machinist. Power down and lock out the lathe before mounting or removing the chuck. Verify chuck mounting bolts are torqued evenly and that the chuck runs within acceptable runout tolerance before cutting. Jaw slots should be kept clean and lightly lubricated to maintain smooth independent jaw movement.