Wexmar offers thread milling services for internal and external threads that need precise size, clean form, and reliable results in difficult materials. We thread mill on Mazak horizontal machining centers and on live-tool CNC lathes, producing ports, bosses, large-diameter threads, and threads in stainless steel, nickel alloys, and titanium. If you are searching for a CNC thread milling shop or thread milling near me in Central New York, our Canastota shop near Syracuse quotes and machines this work directly.
What thread milling is
Thread milling cuts a thread with a rotating tool that is smaller than the thread itself. The machine moves the tool in a helical path, one pitch per revolution, while the tool's profile forms the thread flanks. Because the cutter is smaller than the hole, chips stay small and clear easily, and the thread size is set by the program rather than by a fixed tap diameter. That means a thread can be adjusted by thousandths to hit a gage, one tool can cut several diameters with the same pitch, and a broken tool does not leave a tap welded into an expensive part.
When a buyer needs thread milling
- Threads in stainless, Inconel, Hastelloy, or titanium where tapping risks breakage
- Large-diameter threads where a tap would be costly or impractical
- Hydraulic and pneumatic ports that must seal reliably
- Threads close to the bottom of a blind hole, where thread milling reaches full depth
- Class 3B threads or threads with tight pitch diameter callouts
- High-value parts where a broken tap would scrap hours of prior machining
Wexmar machines used for thread milling
Most thread milling runs on our six Mazak horizontal machining centers: two FH4800s, a PFH4800, a Nexus 4000-II, and two Nexus 5000-II machines, all with pallet changers. Threads on the sides of a manifold or housing can be cut on each face as the pallet indexes. Turned parts with radial or face threads can be thread milled on our live-tool lathes, including the Mazak Nexus and Multiplex machines and the Doosan Lynx 2100A. See the machine list and our tapping and threading page for other thread processes.
Thread milling versus tapping
Tapping is fast and economical for small, common threads in free-cutting materials, and we use it where it fits. Thread milling takes a little longer per hole but gives better control of thread size and form, lower risk in tough alloys, and full-depth threads in blind holes. For most production parts, we tap standard holes and thread mill the critical or large ones.
Typical tolerances and finishes
| Item | Typical capability |
|---|---|
| Internal thread class | 2B standard; 3B by review |
| External thread class | 2A standard; 3A by review |
| Thread forms | UN, UNC, UNF, metric, NPT and NPTF tapered, SAE straight-thread ports |
| Thread position | 0.005 in typical; 0.002 in by review |
| Thread flank finish | 63 Ra typical; 32 Ra by review |
| Verification | Calibrated go/no-go plug and ring gages |
Special forms such as Acme or buttress are reviewed case by case. Thread forms and classes shown are typical, not a limit.
Materials
Thread milling is well suited to 300-series, 400-series, and PH stainless, Nitronic 50, Inconel, Monel, Hastelloy, and titanium, where tapping is most likely to fail. We also thread mill aluminum, carbon and alloy steels, brass, bronze, copper, and engineered plastics when the thread size or class makes it the better option.
Quantity fit
Thread milling fits prototypes and production alike. On prototypes it lets us dial in a thread size without buying a special tap. On production, a single thread mill can cut several thread sizes of the same pitch, reducing tool changes, and the reduced breakage risk protects expensive parts late in the routing.
Inspection deliverables
Threads are verified with calibrated go/no-go plug and ring gages maintained under ISO/IEC 17025-aligned calibration practices. Thread positions are verified on our Brown & Sharpe CMMs when the print requires. We provide CMM reports, AS9102-format first articles, material certifications, and heat-lot traceability. Read more on our inspection and quality page.
Getting a quote
Send a drawing that lists thread form, size, class, and depth. You can upload a drawing for an instant estimate, and a human estimator confirms every quote. Call (315) 400-2654 or email ron@backwell.com, Monday through Friday, 7 a.m. to 4 p.m. Eastern.