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.

Request a quote for this tool →View full specifications →Download spec sheet →Download Complete PDF

Specs

IPK+ — medium machining

IPK+ — Medium Machining, New Chipbreaker

Reduced burr formation, good surface finish, low cutting forces — stainless steel.

Example: CNMG 120408-IPK+. Depth of cut 1.00–4.20 mm, feed 0.40–0.22 mm.

Turning stainless steel neg "M20" — GTCM120HP

Designation	Material No.	Available
CNMG 090304-IPK+	MM14620558	●
CNMG 090308-IPK+	MM12563653	●
CNMG 120404-IPK+	MM12233866	●
CNMG 120408-IPK+	MM12233867	●
CNMG 120412-IPK+	MM14620560	○
DNMG 110404-IPK+	MM14600542	●
DNMG 110408-IPK+	MM14600544	●
DNMG 150404-IPK+	MM14600546	●
DNMG 150408-IPK+	MM14681077	●
DNMG 150604-IPK+	MM12233869	●
DNMG 150608-IPK+	MM12233868	●
SNMG 120408-IPK+	MM14600552	●
TNMG 160404-IPK+	MM14600556	●
TNMG 160408-IPK+	MM14600566	●
VNMG 160408-IPK+	MM14600567	●
WNMG 060404-IPK+	MM14620561	●
WNMG 060408-IPK+	MM14620547	●
WNMG 080404-IPK+	MM12233872	●
WNMG 080408-IPK+	MM12233870	●

Turning stainless steel neg "M25" — GTPM125

Designation	Material No.	Available
CNMG 090304-IPK+	MM11812968	●
CNMG 090308-IPK+	MM11812211	●
CNMG 120404-IPK+	MM11748122	●
CNMG 120408-IPK+	MM11748123	●
DNMG 110404-IPK+	MM11808002	●
DNMG 110408-IPK+	MM11807993	●
DNMG 150404-IPK+	MM11753922	●
DNMG 150408-IPK+	MM11753921	●
DNMG 150604-IPK+	MM11748133	●
DNMG 150608-IPK+	MM11748134	●
SNMG 120408-IPK+	MM11804482	●
TNMG 160404-IPK+	MM11748628	●
TNMG 160408-IPK+	MM11748632	●
VNMG 160408-IPK+	MM11754890	●
WNMG 060404-IPK+	MM11808488	●
WNMG 060408-IPK+	MM11808489	●
WNMG 080404-IPK+	MM11749341	●
WNMG 080408-IPK+	MM11749343	●
WNMG 080412-IPK+	MM11808490	●

Turning stainless steel neg — GTCM120HP (new chipbreaker variant)

Designation	Material No.	Available
CNMG 120404-IPK+	MM12233866	●
CNMG 120408-IPK+	MM12233867	●
DNMG 150604-IPK+	MM12233869	●
DNMG 150608-IPK+	MM12233868	●
WNMG 080404-IPK+	MM12233872	●
WNMG 080408-IPK+	MM12233870	●

Cutting data — general cutting parameters by workpiece material

Swipe to see more →

Group	Type / alloy	Hardness HB	GTCM120HP vc	GTPM125 vc	GTPM135M vc
P	Non-alloyed steel 0–0.45% C	150–250	150–250	130–250	150–190
P	Low-alloyed steel	250–300	100–200	60–180	90–150
P	High-alloyed steel	200	120–220	80–200	120–200
P	Corrosion-resistant steel	200	120–220	100–200	140–180
M	Ferritic stainless	200	190–250	120–250	140–200
M	Austenitic stainless	180	140–220	100–220	110–190
M	Duplex stainless	230–260	110–170	60–160	80–150
M	Martensitic stainless	330	40–100	40–100	55–75

Rated for consistent cutting depth; interrupted cuts not recommended.

View full page →