Chuck Adapter, 1-1/2"-8 Thread 4" Diameter, 3 Holes

Cast iron lathe chuck backplate adapter fits lathes with 1-1/2"-8 spindle nose thread
Adapter is 4" (100 mm) in diameter and has three chuck mounting holes for a 3-jaw chuck
For 4" 3-jaw chucks
Includes instructions for final turning of the registration diameter to ensure concentricity

Part Number: 1918
Weight: 2.20 lb

Price: $34.95

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Description

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

NOTE: PN 1792 is the same adapter just without the 3 holes pre-drilled.

*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	1.5"-8
Bolt Holes	3
Bolt Size	M8
Bolt Circle	Ø 3.3" (84 mm)
Hub Diameter	Ø 2.2" (56 mm)
Hub Length	Ø 0.6" (14 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:

1698 Lathe Chuck, 3-Jaw 4"