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.
IPR+ — medium machining & light roughing
IPR+ — Medium Machining & Light Roughing
Sharp positive cutting edges, reduced burrs, stainless steel "M25".
Example: CNMG 120408-IPR+. Depth of cut 1.50–6.00 mm, feed 0.50–0.25 mm.
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| Designation | Chipbreaker | Material No. | Available |
|---|---|---|---|
| CNMG 120408-IPR+ GTPM125 | …-IPR+ | MM11752697 | ● |
| CNMG 120412-IPR+ GTPM125 | …-IPR+ | MM11752698 | ● |
| DNMG 150608-IPR+ GTPM125 | …-IPR+ | MM11752693 | ● |
| DNMG 150612-IPR+ GTPM125 | …-IPR+ | MM11752691 | ● |
| TNMG 160408-IPR+ GTPM125 | …-IPR+ | MM11752690 | ● |
| TNMG 160412-IPR+ GTPM125 | …-IPR+ | MM11752688 | ● |
| WNMG 080408-IPR+ GTPM125 | …-IPR+ | MM11752687 | ● |
| WNMG 080412-IPR+ GTPM125 | …-IPR+ | MM11752685 | ● |
Cutting data — general cutting parameters by workpiece material
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| Group | Type / alloy | Hardness HB | GTPM125 vc | GTPM135 vc |
|---|---|---|---|---|
| P | Non-alloyed steel 0–0.45% C | 150–250 | 130–250 | 170–190 |
| P | Low-alloyed steel | 250–300 | 60–180 | 90–150 |
| P | High-alloyed steel | 200 | 80–200 | 120–200 |
| P | Corrosion-resistant steel | 200 | 100–200 | 140–180 |
| M | Ferritic stainless | 200 | 120–250 | 140–200 |
| M | Austenitic stainless | 180 | 100–220 | 110–190 |
| M | Duplex stainless | 230–260 | 60–160 | 80–150 |
| M | Martensitic stainless | 330 | 40–100 | 55–75 |
Rated for consistent and inconsistent cutting depth; not for interrupted cuts.