Chuck Adapter, 1"-10 Thread 4" Diameter 

Chuck Adapter, 1"-10 Thread 4" Diameter
  • Cast iron lathe chuck backplate adapter fits lathes with 1"-10 spindle nose thread
  • Adapter is 4" (100 mm) in diameter and has no chuck mounting holes
  • For all 3" chucks and 4" 4-jaw chucks
  • Includes instructions for final turning of the registration diameter to ensure concentricity
Part Number: 1791
Weight: 2.36 lb

Price: $34.95

In stock
This adapter is for a 4" 3-Jaw chuck such as PN 1698.

See PN 1917 for a 4" diameter adapter pre-drilled for a 3-jaw chuck.

*NOTE* These 4" chuck adapters require machining on the lathe on which they will be used.

Instructions are included for final turning of the registration diameter on your lathe to ensure perfect concentricity.

Chris Chris' Tips
Too many adapters? See our chart that correlates lathe spindle threads to lathe chuck adapters and our chart that provides dimensions of threaded lathe chuck adapters.

These adapters must be machined on your lathe to fit the chuck so that it is concentric on the lathe. In most cases you have to drill the chuck mounting holes also.

We provide complete instructions for mounting the adapter. Our transfer screw sets are the perfect tool for marking the chuck mounting holes on a lathe chuck adapter.

WOODWORKERS: Our threaded adapters are not suitable for use on wood turning lathes. Please do not purchase them for this application. These adapters require machining on the lathe on which they will be used, and this is impossible on a wood lathe.

Nominal Size 4"
Outside Diameter Ø 3.9" (100 mm)
Thread 1"-10
Bolt Holes None
Hub Diameter Ø 2.2" (56 mm)
Hub Length Ø 0.4" (10 mm)
Flange Thickness Ø 0.6" (16 mm)
Registration Boss Ø 0.1" (3 mm)
Registration Diameter Ø 2.8" (72 mm)


This product works with these products:

This product works with the following lathes. (If your machine is not on this list, we cannot verify compatibility.)

  •   Craftsman & Atlas 612 6x18 Lathe