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Lathe Chuck, 4-Jaw 4", Self-Centering 

Lathe Chuck, 4-Jaw 4", Self-Centering
  • 4-jaw self-centering lathe chuck
  • 4" (100 mm) diameter
  • Plain back mounting
  • Includes chuck key, inside and outside jaws
  • High grade tool steel
Part Number: 2361
Weight: 7.60 lb

Price: $165.50

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4 inch, 4-Jaw self-centering lathe chuck for square or octagonal work.

The through bore of this chuck is 20 mm (0.79").

This lathe chuck can hold work up to 80 mm (3.15") in diameter.

The radial runout of a test bar held in this chuck, when the chuck is mounted true, is 0.004" maximum.

Chris Chris' Tips
This is a fairly specialized chuck for turning square or octagonal stock.

A 4-jaw independent chuck is a lot more commonly used.

Here is a chart that provides lathe chuck capacities and mounting dimensions.

Specifications
Rated Capacity, Inside Jaws 0.08" - 1.18" (2.0 mm - 30.0 mm)
Rated Capacity, Jamming Range 1.18" - 3.54" (30.0 mm - 90.0 mm)
Rated Capacity, Outside Jaws 1.18" - 3.15" (30.0 mm - 80.0 mm)
Runout (Max) ≤ 0.0032" (0.081 mm)
Diameter, Overall 3.94" (100.0 mm)
Registration Recess Diameter 2.83" (72.0 mm)
Registration Recess Depth 0.14" (3.5 mm)
Bolt Circle Diameter 3.31" (84.0 mm)
Center Hole Diameter 0.87" (22.0 mm)
Height 2.17" (55.0 mm)
Jaw Height Above Face 0.91" (23.0 mm)
Height with Jaws 2.91" (74.0 mm)
Number and Size of Bolts 3 M8
Chuck Key 0.31" (8.0 mm)
Max RPM 3500 RPM
Chuck Designation K12-100