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.
909+ — cast iron medium & roughing
909+ — Cast Iron Medium & Roughing
CNMG/SNMG/TNMG/WNMG plus flat-top EN (no-chipbreaker) inserts, cast iron "K20".
Example: CNMG 120408-909+. Depth of cut 2.00–4.80 mm, feed 0.48–0.30 mm. Rated for consistent and inconsistent cutting depth; interrupted cuts only on flat-top (…NMA) inserts.
GTCK120
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| Designation | Chipbreaker | Material No. | Available |
|---|---|---|---|
| CNMG 120408-909+ GTCK120 | …-909+ | MM11821829 | ● |
| CNMG 120412-909+ GTCK120 | …-909+ | MM11821831 | ● |
| CNMG 160612-909+ GTCK120 | …-909+ | MM11781440 | ● |
| DNMG 150608-909+ GTCK120 | …-909+ | MM11821833 | ● |
| SNMG 120408-909+ GTCK120 | …-909+ | MM11821834 | ● |
| TNMG 160408-909+ GTCK120 | …-909+ | MM11875228 | ● |
| WNMG 080408-909+ GTCK120 | …-909+ | MM11875227 | ● |
| WNMG 080412-909+ GTCK120 | …-909+ | MM11875229 | ● |
| CNMA 120408-EN GTCK120 | …-EN | MM11821837 | ● |
| CNMA 120412-EN GTCK120 | …-EN | MM11931076 | ● |
| CNMA 120416-EN GTCK120 | …-EN | MM11946726 | ● |
| SNMA 120408-EN GTCK120 | …-EN | MM11821838 | ● |
| TNMA 160408-EN GTCK120 | …-EN | MM11821839 | ● |
| WNMA 080408-EN GTCK120 | …-EN | MM11821840 | ● |
GTCK110HP
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| Designation | Chipbreaker | Material No. | Available |
|---|---|---|---|
| CNMG 120408-909+ GTCK110HP | …-909+ | MM12149710 | ● |
| CNMG 120412-909+ GTCK110HP | …-909+ | MM12200956 | ● |
| CNMG 160612-909+ GTCK110HP | …-909+ | MM12200958 | ● |
| SNMG 120412-909+ GTCK110HP | …-909+ | MM12200959 | ● |
| WNMG 080408-909+ GTCK110HP | …-909+ | MM12200960 | ● |
| WNMG 080412-909+ GTCK110HP | …-909+ | MM12200954 | ● |
| CNMA 120408-EN GTCK110HP | …-EN | MM12234327 | ● |
| WNMA 080412-EN GTCK110HP | …-EN | MM12234328 | ● |
Cutting data — general cutting parameters by workpiece material
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| Group | Type / alloy | Hardness HB | GTCK120 vc | GTCK110HP vc |
|---|---|---|---|---|
| P | Non-alloyed steel 0–0.45% C | 150–250 | 200–340 | 220–400 |
| P | Low-alloyed steel | 250–300 | 150–290 | 170–340 |
| P | High-alloyed steel | 200 | 150–290 | 170–340 |
| P | Corrosion-resistant steel | 200 | 160–290 | 200–300 |
| K | Grey cast iron | 180 | 150–400 | 170–450 |
| K | Spheroidal cast iron | 160 | 200–450 | 220–430 |
| K | Malleable/tempered iron | 130 | 200–550 | 220–400 |