Chuck Adapter, 1"-8 Thread 4" Diameter

Cast iron lathe chuck backplate adapter fits lathes with 1"-8 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: 1790
Weight: 2.36 lb

Price: $34.95

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Description

See LittleMachineShop.com PN 1916 for a 4" diameter adapter pre-drilled for a 3-jaw chuck.

*NOTE* These 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' Tips

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.

Specifications

Specifications
Nominal Size	4"
Outside Diameter	Ø 3.9" (100 mm)
Thread	1"-8
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)

Compatibility

Compatibility

This product works with these LittleMachineShop.com products:

1187 Lathe Chuck, 3-Jaw 3"
1175 Lathe Chuck, 4-Jaw 3", Independent
1588 Lathe Chuck, 4-Jaw 4", Independent
2276 Lathe Chuck, 6-Jaw 4", Self-Centering

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

Craftsman & Atlas 612 6x18 Lathe