Browse by Thread Form
Thread Forms — Indexable Thread Milling Inserts (Metric, BSP, NPT & More)
Mill-Thread Indexable Inserts are a versatile solution for producing precise internal and external threads across a wide range of CNC machining applications. Designed to support multiple industry-standard thread forms, this range includes Metric, UNC/UNF, BSP, NPT, ACME, Whitworth and more — giving engineers complete flexibility when machining different thread standards.
Available in five lengths from 12mm to 40mm, these inserts cover a wide range of pitches from fine to coarse, delivering accurate thread profiles, excellent surface finish, and consistent performance across diverse materials and machining environments.
Supported Thread Forms
Our indexable threading inserts cover:
- Metric Threads (ISO)
- UN Threads (UNC, UNF, UNEF, UNJ)
- BSP Threads (BSPP / BSPT)
- NPT / NPTF Threads
- NPS / NPSF Threads
- ACME Threads
- Whitworth Threads (BSW / BSF)
- PG Threads
- NSPM Threads
Key Benefits of Indexable Threading Inserts
- Multi-Standard Compatibility: One system covers multiple thread forms
- Replaceable Inserts: Reduce tooling costs and downtime
- Wide Pitch Range: From fine threads to coarse applications
- High Precision: Consistent, accurate thread profiles
- Excellent Surface Finish: Optimised geometry reduces vibration
- Versatile Applications: Suitable for internal and external threading
General Thread Form Questions
Q: What are thread forms?
A: Thread forms refer to the shape and standard of screw threads, including angle, pitch, and profile used for fastening or sealing applications.
Q: Why are there different thread standards?
A: Different industries and regions developed their own standards for compatibility, sealing performance, and mechanical strength.
Q: Can one tool cut multiple thread forms?
A: Yes, indexable thread milling systems allow different inserts to be used in the same holder for various thread types.
Q: What is the most common thread type?
A: Metric threads and Unified (UNC/UNF) threads are the most widely used globally.
Q: What is thread pitch?
A: Thread pitch is the distance between threads, measured in millimetres (metric) or threads per inch (TPI).
