Negative turning inserts
ISO negative carbide inserts (NST) — nine chip grooves from finishing to roughing in steel, stainless and cast iron.
Galtona's NST range is the widest negative-turning program, with nine dedicated chip grooves for finishing through roughing.
For steel: SWX+ (Masterfinish, high surface quality), WL+ (light finishing), WM+ — the broadest range, spanning 7 insert shapes across GTCP115, GTCP125, GTCP125HP, GTCP135, and cast-iron GTCK120 — and WR+ for medium roughing.
For stainless and exotic materials: JF (cermet finishing), EXK+ (CNGP/DNGP/VNGP/WNGP finishing), IPK+ (new chipbreaker, low cutting forces), and IPR+ (medium machining and light roughing).
For cast iron roughing: 909+, available in coated-carbide GTCK120/GTCK110HP, including flat-top (no-chipbreaker) …-EN inserts rated for interrupted cuts.
JF — cermet finishing
JF — Cermet Finishing
Fine finishing with cermet grade TCM10.
Example: CNMG 120408EN-JF. Depth of cut 0.10–2.00 mm, feed 0.20–0.05 mm. Consistent cutting depth only — not for interrupted or inconsistent-depth cuts.
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| Designation | Chipbreaker | Material No. | Available |
|---|---|---|---|
| CNMG 120404EN-JF TCM10 | …-JF | MM11882894 | ● |
| CNMG 120408EN-JF TCM10 | …-JF | MM11882895 | ● |
| DNMG 110404EN-JF TCM10 | …-JF | MM11882708 | ● |
| DNMG 150604EN-JF TCM10 | …-JF | MM11882698 | ● |
Cutting data — general cutting parameters by workpiece material
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| Group | Type / alloy | Hardness HB | TCM10 vc [m/min] |
|---|---|---|---|
| P | Non-alloyed steel 0–0.45% C | 150–250 | 230–270 |
| P | Low-alloyed steel | 250–300 | 180–230 |
| P | High-alloyed steel | 200 | 160–200 |
| P | Corrosion-resistant steel | 200 | 230–270 |
| M | Ferritic stainless | 200 | 170–240 |
| M | Austenitic stainless | 180 | 200–240 |
| M | Martensitic stainless | 330 | 130–160 |
| K | Spheroidal cast iron | 160 | 220–300 |
| K | Malleable/tempered iron | 130 | 250–350 |