SNMM-GZ – INNOT insert

SNMM-GZ

90° negative square insert for heavy roughing of steels, with GZ chipbreaker and INNOT CVD grades. Large depths of cut and high feeds.

ISO P
Heavy roughing
CVD
★ IT8115 · IT8225

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Technical data sheet PDFCutting data, sizes and grades

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INNOT grades

CVD, PVD and cermet for ISO P, M, K, S

Standard ISO designation

Compatible with the insert holders you use

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Description

ISO specifications

ISO RADIUS (RE) AVAILABLE GRADES CHIPBREAKER
SNMM1506 1.2 IT8115 – IT8125 – IT8225 – IT8135 GZ
SNMM1906 0.8 – 1.2 – 1.6 – 2.4 IT8115 – IT8125 – IT8225 – IT8135 GZ
SNMM2509 2.4 – 3.2 IT8115 – IT8125 – IT8225 – IT8135 GZ

GZ chipbreaker data sheet

Operation Heavy roughing
ISO material P (non-alloy, alloy and tool steels)
Tolerance M
Features Chipbreaker for heavy-duty machining of ISO P materials. The rake face with exclusively designed bosses reduces the chip contact area at large depths of cut and ensures excellent chip control. The sharp cutting edge effectively reduces cutting forces. Suitable for depths of cut up to 12 mm on the largest sizes. 90° square shape: the strongest of the negative inserts, ideal for heavy roughing, facing and 45° chamfers.

Available INNOT grades

Grade ISO Coating Composition Application
IT8115 ★ P CVD TiN + MT-TiCN + Al₂O₃ Continuous and lightly interrupted cuts. Finishing and semi-finishing of carbon and alloy steels.
IT8125 P CVD TiN + MT-TiCN + Al₂O₃ Interrupted and continuous cuts on steel. The reinforced substrate limits plastic deformation at high temperature.
IT8225 ★ P CVD TiN + MT-TiCN + Al₂O₃ First-choice grade for steel, very versatile. Multilayer coating with excellent wear resistance and toughness.
IT8135 P CVD TiN + MT-TiCN + Al₂O₃ Grade for turning steel with heavy impacts. High-toughness substrate and reinforced binder phase: excellent impact resistance in heavily interrupted cuts.

★ Recommended grade for this chipbreaker. CVD = chemical vapour deposition coating. ISO P = steels.

Recommended cutting data

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF
Heavy external turning of steels (ISO P)

Recommended cutting data for the GZ chipbreaker, by material and cutting condition.

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Non-alloy and alloy steels ≤ 280 HB
(S235, C45, 41Cr4, 42CrMo4…)		 Stable IT8115: 100 – 200
IT8125: 100 – 180
IT8225: 100 – 195		 0.25 – 1.00 3.00 – 12.00
Non-alloy and alloy steels ≤ 280 HB
(S235, C45, 41Cr4, 42CrMo4…)		 Average IT8115: 100 – 200
IT8125: 100 – 180
IT8225: 100 – 195		 0.25 – 0.95 3.00 – 12.00
Non-alloy and alloy steels ≤ 280 HB
(S235, C45, 41Cr4, 42CrMo4…)		 Difficult IT8115 · IT8125 · IT8225: 60 – 180 0.25 – 0.90 3.00 – 12.00
Quenched and tempered steels ≥ 280 HB Stable IT8115: 120 – 245
IT8225: 100 – 190		 0.50 – 1.26 3.00 – 11.00
Quenched and tempered steels ≥ 280 HB Average IT8115: 110 – 245
IT8225: 90 – 190		 0.50 – 1.21 3.00 – 11.00

For steels ≥ 280 HB IT8115 and IT8225 are recommended. IT8135 is the grade for heavy impacts and heavily interrupted cuts: cutting data on request.

Heavy internal turning (boring) of steels (ISO P)

Starting values for internal turning with a boring bar, derived from this insert's external turning data: cutting speed −15%, feed −20%, maximum depth of cut −40%. Negative inserts are mounted on boring bars for bores from about Ø 25 mm upwards (Ø 32–40 mm for the larger sizes). Heavy roughing needs rigid boring bars in large bores, indicatively above Ø 60 mm.

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Non-alloy and alloy steels ≤ 280 HB
(S235, C45, 41Cr4, 42CrMo4…)		 Stable IT8115: 85 – 170
IT8125: 85 – 155
IT8225: 85 – 165		 0.20 – 0.80 3.00 – 7.20
Non-alloy and alloy steels ≤ 280 HB
(S235, C45, 41Cr4, 42CrMo4…)		 Average IT8115: 85 – 170
IT8125: 85 – 155
IT8225: 85 – 165		 0.20 – 0.76 3.00 – 7.20
Non-alloy and alloy steels ≤ 280 HB
(S235, C45, 41Cr4, 42CrMo4…)		 Difficult IT8115 · IT8125 · IT8225: 50 – 155 0.20 – 0.72 3.00 – 7.20
Quenched and tempered steels ≥ 280 HB Stable IT8115: 100 – 210
IT8225: 85 – 160		 0.40 – 1.01 3.00 – 6.60
Quenched and tempered steels ≥ 280 HB Average IT8115: 95 – 210
IT8225: 75 – 160		 0.40 – 0.97 3.00 – 6.60

With a boring bar overhang above 3 times the diameter (steel bar) or 5 times (carbide or anti-vibration bar), reduce speed and feed further. Use the bar's internal coolant to clear the chips.

Depth of cut and insert size. The ap range up to 12 mm is the limit of the GZ chipbreaker and is exploited with SNMM1906 and SNMM2509. With SNMM1506 (15.9 mm cutting edge) stay within about 2/3 of the edge, i.e. around 10 mm depth of cut.