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Charnwood Insert 1'' x 12tpi (W836 Nexus 3 & Viper 3 & 5)

Headstock thread adaptor.

To fit onto a lathe with 1" x 12tpi headstock thread.

To mount a scroll chuck (or face plate) with M33 x 3.5mm thread.

Suitalbe for use with Charnwood Scroll Chucks Nexus3, Viper3 & Viper5. Plus any other brand with a M33 x 3.5mm thread.

Includes 2 x 8mm diameter holes to aid tightening or removal with a knock out bar.


Adaptor Type Insert
Overall Length 32mm
External Thread Size (Chuck) M33 x 3.5
External Thread Length 22mm
Internal Thread Size (Lathe) 1" x 12tpi
Internal thread Length 25mm
Register 7mm
Minimum Headstock Thread Length 30mm


If you are not sure about the thread size you need, please download our How To guide: Measuring A Lathe Headstock Thread Size. 

Compatible with the following lathes (among others):
Axminster H1000
Excel NCL800
Excel NCL1000
Grizzly 10672
Grizzly G1495
Myford ML8

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