TNMA – INNOT insert

TNMA

60° flat negative triangular insert, without chipbreaker, for turning cast iron with CVD grade IT6115.

ISO K
Roughing – unstable cuts
CVD
★ IT6115

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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
TNMA1604 0.4 – 0.8 – 1.2 IT6115 Flat (no chipbreaker)
TNMA2204 0.8 – 1.2 – 1.6 IT6115 Flat (no chipbreaker)

Flat (no chipbreaker) data sheet

Operation Roughing – unstable cuts
ISO material K (grey cast iron)
Tolerance M
Features Flat insert without chipbreaker for ISO K materials. It has high structural strength and excellent support on the toolholder: it is the safest choice for unstable and interrupted cuts on cast iron. 60° triangular shape: 6 usable cutting edges (3 per side), very versatile for longitudinal turning and facing with a wide choice of toolholders.

Available INNOT grades

Grade ISO Coating Composition Application
IT6115 ★ K CVD TiN + MT-TiCN + Al₂O₃ First-choice grade for turning cast iron. Thicker black CVD coating with special post-coating treatment: excellent wear resistance and toughness. Also suitable for roughing high-strength steels.

★ Recommended grade for this chipbreaker. CVD = chemical vapour deposition coating. ISO K = cast irons.

Recommended cutting data

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF
External turning of cast iron (ISO K)

Recommended cutting data for grey cast iron, strength ≤ 350 MPa.

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Grey cast iron
(GG20, GG30 – EN-GJL-200, EN-GJL-300)		 Stable IT6115: 155 – 285 0.20 – 0.60 2.50 – 6.00
Grey cast iron
(GG20, GG30 – EN-GJL-200, EN-GJL-300)		 Average IT6115: 155 – 285 0.20 – 0.55 2.50 – 6.00
Grey cast iron
(GG20, GG30 – EN-GJL-200, EN-GJL-300)		 Difficult IT6115: 155 – 285 0.20 – 0.50 2.50 – 6.00

Guide values. The flat insert is especially suitable for unstable and interrupted cuts.

Internal turning (boring) of cast iron (ISO K)

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).

Material Condition Vc (m/min) by grade fn (mm/rev) ap (mm)
Grey cast iron
(GG20, GG30 – EN-GJL-200, EN-GJL-300)		 Stable IT6115: 130 – 240 0.16 – 0.48 2.50 – 3.60
Grey cast iron
(GG20, GG30 – EN-GJL-200, EN-GJL-300)		 Average IT6115: 130 – 240 0.16 – 0.44 2.50 – 3.60
Grey cast iron
(GG20, GG30 – EN-GJL-200, EN-GJL-300)		 Difficult IT6115: 130 – 240 0.16 – 0.40 2.50 – 3.60

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.