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.
WL+ — light finishing
WL+ — New Chipbreaker, Light Finishing
FEM-optimised: increased tool life, reduced temperature and stress.
Example: CNMG 120408EN-WL+. Depth of cut 0.50–2.00 mm, feed 0.20–0.10 mm.
Turning steel neg "P15"
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| Designation | Chipbreaker | Material No. | Available |
|---|---|---|---|
| CNMG 090304EN-WL+ GTCP115 | …-WL+ | MM12044441 | ● |
| CNMG 120404EN-WL+ GTCP115 | …-WL+ | MM12044444 | ● |
| CNMG 120408EN-WL+ GTCP115 | …-WL+ | MM12044454 | ● |
| DNMG 110404EN-WL+ GTCP115 | …-WL+ | MM12041499 | ● |
| DNMG 150604EN-WL+ GTCP115 | …-WL+ | MM12041505 | ● |
| DNMG 150608EN-WL+ GTCP115 | …-WL+ | MM12067233 | ● |
| VNMG 160404EN-WL+ GTCP115 | …-WL+ | MM12046214 | ● |
| WNMG 060404EN-WL+ GTCP115 | …-WL+ | MM12046215 | ● |
| WNMG 080404EN-WL+ GTCP115 | …-WL+ | MM12046216 | ● |
Turning steel neg "P25"
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| Designation | Chipbreaker | Material No. | Available |
|---|---|---|---|
| CNMG 120404EN-WL+ GTCP125 | …-WL+ | MM12044450 | ● |
| CNMG 120408EN-WL+ GTCP125 | …-WL+ | MM12044455 | ● |
| DNMG 110404EN-WL+ GTCP125 | …-WL+ | MM12041502 | ● |
Cutting data — general cutting parameters by workpiece material
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| Group | Type / alloy | Hardness HB | GTCP115 vc | GTCP125 vc |
|---|---|---|---|---|
| P | Non-alloyed steel 0–0.45% C | 150–250 | 220–400 | 170–240 |
| P | Low-alloyed steel | 250–300 | 200–320 | 100–190 |
| P | High-alloyed steel | 200 | 180–320 | 130–210 |
| P | Corrosion-resistant steel | 200 | 200–320 | 130–210 |
| M | Ferritic stainless | 200 | 220–320 | 140–210 |
| M | Austenitic stainless | 180 | – | 100–210 |
| M | Martensitic stainless | 330 | – | 70–100 |
Rated for consistent cutting depth only — not inconsistent or interrupted.