Description
- Cast iron lathe chuck backplate adapter fits lathes with M39 x 4 spindle nose thread
- Adapter is 6″ (160 mm) in diameter and has no chuck mounting holes
- For all 5″ and 6″ chucks
- Includes instructions for final turning of the registration diameter to ensure concentricity
This chuck adapter fits 9×20 lathes that have a M39x4 spindle nose thread.
There are no holes in this adapter so you can drill it for either a 3-jaw or 4-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.
| Nominal Size | 6″ |
| Outside Diameter | Ø 6.3″ (160 mm) |
| Thread | M39x4 |
| Bolt Holes | None |
| Hub Diameter | Ø 2.2″ (56 mm) |
| Hub Length | Ø 0.9″ (24 mm) |
| Flange Thickness | Ø 0.6″ (16 mm) |
| Registration Boss | Ø 0.2″ (4 mm) |
| Registration Diameter | Ø 5.1″ (130 mm) |
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