Covid-19 Notice: Jebbtools is operating as normal with strict hygiene procedures in place.

Due to a large increase in orders, and courier logistics, delivery may be delayed. Please read our Delivery Info for more details.


Your Cart is Empty

Order before 2pm for Same Day Dispatch!


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