Mitsubishi TN 60° Triangle Negative Inserts — TNMG, TNGG, TNMA Strongest General-Purpose Turning

48 in-stock 60° triangle negative Mitsubishi indexable carbide turning inserts covering 3 geometry families (TNMG / TNGG / TNMA) and 9 grade families (UC5115 / MC6015 / US735 / VP15TF / VP05RT / UE6020 / UE6110 / UE6010 / NX2525). IC sizes 16-22 mm. The strongest general-purpose negative turning geometry for steel, stainless, and cast iron. 2-3 day dispatch from Zhejiang warehouse, DHL/UPS worldwide 3-7 days, all ISO 1832 compliant.

About TN 60° Triangle Negative Inserts (TN-Style)

The ISO 1832 TN-shape family delivers a 60° triangle negative-rake cutting edge — the strongest general-purpose negative turning geometry with the deepest catalog in turning. Mitsubishi's TN lineup includes three main geometry variants:

• TNMG (M chip-breaker, M tolerance) — 35 SKUs. The workhorse 60° triangle negative with chip-breaker on both faces. Double-edged economy for general roughing and finishing. Multiple chip-breaker variants: MA, MS, MJ, ES, 2G.
• TNGG (G chip-breaker, G tolerance) — 9 SKUs. Ground-periphery cermet finishing insert with chip-breaker on one face. Premium 60° triangle for mirror surface work on steel and stainless.
• TNMA (no chip-breaker, A tolerance) — 3 SKUs. Flat-top negative insert with hole only. Used for cast iron heavy roughing where chip-breaking is not needed.

TN inserts are the bread-and-butter negative turning geometry for general CNC lathe work — every production shop has a drawer full of TNMG inserts. The 60° included angle provides the largest nose radius per IC size, making TNMG ideal for both roughing and finishing. Compared to other negative shapes: SN is the strongest but dullest, CN is balanced, DN is the sharpest, TN is the most versatile.

Mitsubishi's TN catalog is rich in chip-breaker variants — MA (medium all-round), MS (medium semi-finish), MJ (medium profiling), ES (extra-strong), 2G (double-side G ground) — combined with 9 grade options. The 16.0 mm IC (1604 / 1608 / 1612) is most common (42+ SKUs), with 22.0 mm IC for heavy roughing (3 SKUs).

Browse by Application & Grade

All 48 TN 60° triangle negative SKUs are grouped below by application and grade. Click any category to filter the full catalog.

By Workpiece Material

• Cast Iron (K-grade) — TNMA UC5115, TNMG UC5115 (10+ SKUs)
• Stainless Steel (M-grade) — TNMG-MS / MA / ES US735 (8+ SKUs)
• Carbon Steel / Alloy Steel (P-grade) — TNMG-MA UE6020 / UE6110 / UE6010 (10+ SKUs)
• Universal (steel + stainless) — TNMG-MA VP15TF (4+ SKUs)
• Mirror Finishing — TNGG-F NX2525, TNMG-2G NX2525 (10+ SKUs)

By Operation

• Cast Iron Heavy Roughing — TNMA UC5115 (no chip-breaker, free-cutting)
• Steel / Stainless General Turning — TNMG-MA UE6020 / UE6110
• Stainless Profiling — TNMG-ES / -MS US735 (tough edge)
• Mirror Finishing — TNGG-F NX2525 cermet (sharp ground periphery)
• Heavy Steel Roughing (22 mm IC) — TNMG220408-MA UE6020 / UC5115

By Carbide Grade

• CVD Cast Iron (K-grade) — UC5115 (K05-K20), MC6015 (K05-K15 high-speed)
• CVD Stainless Steel (M-grade) — US735 (M10-M25)
• PVD Universal (Miracle Coat) — VP15TF (Al-rich, P/M/S grades), VP05RT (newer PVD grade for high-speed)
• CVD Steel (P-grade) — UE6020 (P20-P30), UE6110 (P15-P25 high-speed), UE6010 (P10-P20)
• Cermet (Finishing) — NX2525 (P05-P15, mirror surface)

By Chip-Breaker

• MA (Medium All-round): General purpose chip-breaker, the most common (15+ SKUs across all grades).
• MS (Medium Semi-finishing): Lighter chip-breaker for finishing and stainless profiling.
• MJ (Medium Profiling): Optimized for profiling operations.
• ES (Extra Strong): Stronger chip-breaker for roughing and interrupted cuts.
• 2G (Double-Side Ground): Ground on both faces — for high-precision cermet finishing.
• F (Sharp Finish): Used only on TNGG (ground periphery) — for mirror surface work.

How to Choose the Right TN 60° Triangle Negative Insert — 3-Step

Step 1 — Identify the Workpiece

• Cast iron (gray, ductile, CGI): TNMA flat-top with UC5115 grade (K-grade CVD) — free cutting, no chip-breaker needed.
• Stainless steel 304/316: TNMG-MS or TNMG-ES with US735 grade (M-grade CVD coated for stainless).
• Carbon steel / alloy steel: TNMG-MA with UE6020 (P20-P30) or UE6110 (P15-P25 high-speed).
• Mirror finishing on steel: TNGG-F with NX2525 cermet (ground periphery for maximum sharpness).
• Universal (steel + stainless): TNMG-MA with VP15TF PVD Miracle Coat.

Step 2 — Pick the Chip-Breaker

• MA (Medium All-round): General purpose, most common.
• MS (Medium Semi-finishing): Lighter chip-breaker for finishing.
• MJ (Medium Profiling): Optimized for profiling operations.
• ES (Extra Strong): Stronger edge for roughing and interrupted cuts.
• 2G (Double-Side Ground): Ground on both faces — premium precision cermet.

Step 3 — Verify Holder Compatibility

• TN (60° negative): Use MTJN-type holders (multi-lock, 60° lead angle) or PTFN (pin lock).
• Verify lead angle: 60° matches TNMG perfectly. Common holders: MTJNR/L 2020-K16 (16 mm IC), MTJNR/L 3232-P22 (22 mm IC).
• Match IC to holder pocket: TNMG 16 needs 16 mm pocket; TNMG 22 needs 22 mm pocket.

Frequently Asked Questions

Related Mitsubishi Inserts & Holders

Need a Specific TN 60° Triangle Insert Not in Stock?

48 in-stock SKUs covering TNMG / TNGG / TNMA in 9 grades. For specialty TNGM (cermet molded), TNMX, or specific Mitsubishi equivalent cross-references (Sandvik / Kennametal / Iscar / Walter), request a quote — 24-hour response, 2-3 day dispatch from Zhejiang, DHL/UPS worldwide 3-7 days.