External thread turning produces high-quality threads at production rates that taps and dies cannot match.
Insert Types
- Full-profile (V-form) — Cuts complete shape in one infeed
- Partial-profile — Tip cuts smaller V; flank built up over passes. Versatile but slower.
- Multi-tooth — Faster but more spindle power needed
Insert Codes
16ER 1.5 ISO
- 16 — IC in mm
- E — External
- R — Right-hand
- 1.5 — Pitch in mm
- ISO — Profile (ISO metric, UN, BSPT, NPT)
Infeed Strategy
- Radial (straight) — Easy to program but stresses tool
- Flank — Single flank cuts, longer tool life
- Modified flank (alternating) — Modern preferred, best finish
Number of Passes
| Pitch (mm) | Steel | Stainless |
|---|---|---|
| 0.5 | 4-6 | 5-8 |
| 1.0 | 6-8 | 8-10 |
| 1.5 | 8-10 | 10-14 |
| 2.0 | 10-12 | 12-16 |
Cutting Speed
Run threading at 60-80% of normal turning speed. Typical: 100-150 m/min in carbon steel, 60-100 m/min in stainless.
Top Brands
- Vargus — Widest standard thread profile range
- Iscar Pent-Cut — 5-edge insert, lower cost-per-thread
- Sandvik CoroThread 266 — Premium for production
- Walter Cut threading — German precision
Browse threading inserts.
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