Products for bench top machinists | LittleMachineShop.com

Chuck Adapter, 1/2"-20 Thread 3" Diameter, 3 Holes

Chuck Adapter, 1/2"-20 Thread 3" Diameter, 3 Holes - Main image
$23.07 $34.95 In stock

This adapter is for a 3" 3-Jaw chuck such as LittleMachineShop.com PN 1187.

* 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.

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Customer Reviews (4.8 / 5 · 5 reviews)

Victoria X. ★★★★★

It took a bit of final turning on my lathe, but once dialed in, the 1/2"-20 threads on this 3-inch adapter mate perfectly with my chuck. The three holes make alignment straightforward, and the fit is solid with no wobble.

Carter B. ★★★★★

Had to face the adapter on my lathe before it would work, but the included instructions made the process straightforward enough. The 3-inch diameter fits my chuck perfectly, and the three-hole pattern lines up exactly as it should.

Eli U. ★★★★★

Finally got the adapter trued up on the spindle—the three bolt holes lined up perfectly and the included turning instructions made the final fit a lot easier than I expected.