Headstock Thread Adaptors

Used for fitting scroll chucks, face plates and other accessories to a woodturning lathe.
We offer a comprehensive series of thread adaptors to convert the headstock thread size on the lathe to allow the mounting of our range of scroll chucks. 

The table below, shows the sizes we offer. If you are not sure about the thread size you need, please download our guide: How To Measure A Lathe Headstock Thread Size. 


Adaptor Type Lathe Headstock Thread Size

Scroll Chuck Thread Size

Internal Thread

External Thread
Stock Ref.
Insert 3/4" x 16tpi 1" x 8tpi 32mm 22mm VIPER2#IN
Insert 3/4" x 16tpi M33 x 3.5 32mm 22mm VIPERID
Insert 3/4" x 10tpi M33 x 3.5 35mm 32mm VIPERIK
Insert 1" x 8tpi M33 x 3.5 32mm 22mm VIPERIA
Insert 1" x 10tpi M33 x 3.5 32mm 22mm VIPERIF
Insert 1" x 12tpi M33 x 3.5 32mm 22mm VIPERIG
Exert 1.1/8" x 12tpi M33 x 3.5 33mm 29mm VIPERIM
Exert 1.1/4" x  8tpi M33 x 3.5 34mm 29mm VIPERIE
Exert 1.1/2" x 6tpi M33 x 3.5 45mm 29mm VIPERIL
Insert M18 x 2.5mm M33 x 3.5 32mm 22mm VIPERIH
Insert M20 x 2.0mm M33 x 3.5 32mm 22mm


Insert M25 x 2.0mm M33 x 3.5 32mm 32mm VIPERIJ
Exert M30 x 3.5mm M33 x 3.5 34mm 29mm VIPERIN
Exert M33 x 3.5mm 3/4" x 16tpi 36mm 25mm VIPERIB
Exert M33 x 3.5mm 1" x 8tpi 36mm 25mm VIPERIC

 We do not offer custom made adaptors, so if the size you need is not listed, Sorry, we cannot help at this time.


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Company Information


Charnwood Machinery Ltd.
Cedar Court, Walker Road,
Hilltop Industrial Estate, Bardon,
Leicestershire, England, LE67 1TU

Phone Number

01530 516 926


01530 516 929

Email Address

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