Heavy-duty turning inserts
Carbide inserts for heavy turning and roughing (HDT) — TCH, HD2, HD5 and HD8 chip grooves plus a dedicated titanium range.
Galtona's HDT range extends the Negative Size Turning program for demanding, heavy-duty turning — from medium roughing up to full interrupted-cut capability.
Four dedicated chip grooves scale with depth of cut: TCH (2.5–10 mm), HD2 (1.5–12 mm, new sharp positive geometry for high-strength steels), HD5 (2–12 mm), and HD8 (2.5–12 mm, rated for consistent, inconsistent, *and* interrupted cuts).
The 909+ groove adds medium-and-roughing coverage across CNMG, SNMG, and TNMG shapes plus RCMT round inserts, in GTCP125, GTCP135, and cast-iron-specific GTCK120 grades.
Also includes a dedicated turning-titanium range ("S15") with IPE+ chipbreaker geometry across CNMG, DNMG, SNMG, TNMG, VNMG, and WNMG insert shapes.
HD8 — heaviest chip groove, interrupted-cut rated
HD8 Chip Groove
Heaviest chip groove in the range — steel "P25", also rated for interrupted cuts.
Example: CNMM 190616SN-HD8. Depth of cut 2.50–12.00 mm, feed 1.20–0.35 mm. Suited to consistent, inconsistent, and interrupted cutting depth.
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| Designation | Chipbreaker | Material No. | Available |
|---|---|---|---|
| CNMM 190616SN-HD8 GTCP125 | …-HD8 | MM11840034 | ● |
| CNMM 190624SN-HD8 GTCP125 | …-HD8 | MM11840035 | ● |
| CNMM 250924SN-HD8 GTCP125 | …-HD8 | MM11840038 | ● |
| CNMM 250932SN-HD8 GTCP125 | …-HD8 | MM11840039 | ● |
| SNMM 190616SN-HD8 GTCP125 | …-HD8 | MM11840043 | ● |
| SNMM 190624SN-HD8 GTCP125 | …-HD8 | MM11840044 | ● |
| SNMM 250924SN-HD8 GTCP125 | …-HD8 | MM11840047 | ● |
| SNMM 250932SN-HD8 GTCP125 | …-HD8 | MM11840048 | ● |
Cutting data — general cutting parameters by workpiece material
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| Group | Type / alloy | Hardness HB | GTCP115 vc | GTCP125 vc | GTCP135 vc |
|---|---|---|---|---|---|
| P | Non-alloyed steel 0–0.45% C | 150–250 | 220–400 | 170–240 | 170–190 |
| P | Low-alloyed steel | 250–300 | 200–320 | 100–190 | 90–150 |
| P | High-alloyed steel | 200 | 180–320 | 130–210 | 120–200 |
| P | Corrosion-resistant steel | 200 | 200–320 | 130–210 | 140–180 |
| M | Ferritic stainless | 200 | 220–320 | 140–210 | 140–200 |
| M | Austenitic stainless | 180 | – | 100–210 | 110–190 |
| M | Duplex stainless | 230–260 | – | – | 80–150 |
| M | Martensitic stainless | 330 | – | 70–100 | 55–75 |
| K | Grey cast iron | 180 | 140–370 | 130–210 | – |
| K | Spheroidal cast iron | 160 | 190–430 | 120–240 | – |
| K | Malleable/tempered iron | 130 | 180–520 | 150–250 | – |