Thread Grinding
Thread grinding produces threads with a formed abrasive wheel after hardening, giving high accuracy in pitch diameter, lead and flank form. It is used for thread gauges, ball-screw and lead-screw components, taps and precision hardened threads.
What it is
A wheel dressed to the thread profile grinds the thread in one or several passes, either on a pre-cut thread or from a solid blank. Because it works on hardened material, the thread keeps its accuracy without heat-treatment distortion.
Ground threads have excellent lead accuracy and surface finish, which matters for gauges, precision screws and motion components.
Typical applications
- Thread plug and ring gauges
- Precision lead screws
- Hardened threaded spindles
- Taps and thread-rolling dies
- Aerospace and instrument threads
Suitable materials
- Hardened alloy and tool steels
- Stainless steels
- High-speed steel
Points to consider
- Thread grinding is slower and costlier than cutting or rolling; use it where hardness or accuracy demands it.
- Specify thread class, pitch diameter tolerance and lead accuracy.
- Allow runout grooves at thread ends for the wheel.
- Use our Thread Finder to confirm thread dimensions.
Frequently asked questions
Why grind a thread instead of cutting it?
Grinding works after hardening and gives better pitch diameter, lead accuracy and finish, essential for gauges and precision screws.
Can trapezoidal threads be ground?
Yes. Trapezoidal, ACME, metric, unified and special thread forms can be ground with suitably dressed wheels.
Is thread grinding expensive?
It costs more than thread cutting or rolling, so it is used where hardness or accuracy makes it necessary.