Quick Answer
Replace the socket head cap screws on your mini lathe's change gear cover with a pair of knurled thumb screws for tool-less, rapid gear changes without needing an Allen wrench.
Why Switch to Thumb Screws?
The change gear cover on most mini lathes is secured by socket head cap screws that require an Allen wrench each time you adjust the gear train. Swapping to knurled thumb screws eliminates that extra step, saving time during frequent gear changes.
Compatibility and Fit
These thumb screws are custom-made to fit HiTorque mini lathes and SIEG SC20, C3, and SC3 models. They have an overall length of 80 mm, with a 16 mm diameter knurled knob that is 4 mm thick. If your lathe is not listed, measure your existing screw length and thread pitch to confirm fit.
Frequently Asked Questions
Can I use these thumb screws on any mini lathe?
They are specifically designed for HiTorque mini lathes and SIEG SC20, C3, and SC3 models. For other lathes, measure the original screw length and thread pitch to check compatibility.
How do I install the thumb screws?
Remove the existing socket head cap screws from the change gear cover. Hand-thread the knurled thumb screws into the same holes. Tighten by turning the knurled knob until snug. No tools required.
Will the thumb screws stay tight during operation?
Yes, the knurled knob allows you to apply sufficient hand torque. Check tightness periodically, especially after initial installation, as vibration can loosen them. If you experience loosening, consider a drop of removable threadlocker on the threads.
Can I use them elsewhere on the lathe?
While designed for the change gear cover, they can be used on any M8 or similar threaded hole where a tool-less fastener is helpful, provided the length and thread pitch match.
Product Facts
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Thumb Screw, Knurled, Mini Lathe (Pair): Custom made for LittleMachineShop.com to fit HiTorque mini lathes and SIEG SC20, C3, and SC3 mini lathes. Sold as a pair of screws. Overall length is 80 mm. Knurled knob is 16 mm in diameter and 4 mm thick. This ensures a direct replacement without modification, and the knurled knob provides a secure grip for hand tightening.
Thumb Screw, Knurled, Mini Lathe (Pair)