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Indentifying the Headstock Spindle Thread Size of your Lathe
How to Measure a Lathe Headstock Thread
To fit any accessories to your lathe, you will need to know the headstock spindle thread size. Bear in mind, these can be manufactured in Imperial or Metric sizes.
1) Using an accurate ruler, or pair of callipers, measure the thread diameter (at the widest point).
2) Measure the thread pitch, also known as threads per Inch (tpi). If the thread is imperial size, count how many turns in half an inch and then double it. If the thread is Metric count as many turns as you can.
Examples
Imperial Size:
![](https://www.machinery4wood.co.uk/extraimages/spindle_size_example_1.JPG)
Metric Size:
![](https://www.machinery4wood.co.uk/extraimages/spindle_size_example_2.JPG)
If your lathe is 10 years old or less, it will almost certainly be one of these 3 sizes:
3/4” x 16tpi
1” x 8tpi
M33 x 3.5mm
Other less common thread sizes are:
3/4" x 10tpi
1" x 10tpi
1" x 12tpi
1.1/8" x 12tpi
1.1/4" x 8tpi
1.1/2" x 6tpi
M18 x 2.5mm
M20 x 2mm
M25 x 2mm
M30 x 3.5mm