Mitsubishi WN 80° Trigon Zero-Rake Inserts — WNMG, WNMA Heavy-Duty Cast Iron & Steel Roughing

69 in-stock 80° trigon zero-rake (0° clearance) Mitsubishi indexable carbide turning inserts covering 2 geometry families (WNMG / WNMA) and 14 grade families (UC5115 / UC5105 / MC5015 / MC5005 / MC6025 / MC7025 / US735 / US7020 / MP735 / VP15TF / UE6020 / UE6110 / UE6120 / NX2525). IC sizes 6.0-12.7 mm. The strongest 80° trigon edge for cast iron heavy roughing and interrupted steel cuts. 2-3 day dispatch from Zhejiang warehouse, DHL/UPS worldwide 3-7 days, all ISO 1832 compliant.

About WN 80° Trigon Zero-Rake Inserts (WN-Style)

The ISO 1832 WN-shape family delivers an 80° trigon cutting edge with 0° clearance angle — the strongest and most negative-rake variant in the W-family. Mitsubishi's WN lineup includes two main geometry variants:

• WNMG (M chip-breaker, M tolerance) — 66+ SKUs. The workhorse 80° zero-rake trigon negative with chip-breaker on both faces. Available in IC 6.0 / 8.0 / 9.5 / 12.7 mm, with multiple chip-breaker variants: MA / MS / MW (wiper) / MP / MK / MM / GK / GH / SA / FP / F.
• WNMA (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.

WN inserts are the strongest 80° trigon edge in the W-family — 0° clearance means the insert sits flat on the holder without any rake angle, providing maximum edge support for heavy interrupted cuts and cast iron roughing. Compared to other 80° trigon shapes: WB (5° positive) is sharper, WC (7° negative) is balanced, WN (0° zero-rake) is the strongest. Common applications include heavy roughing of small-to-medium cast iron parts, interrupted steel cuts, and roughing where edge chipping is a concern.

Mitsubishi's WN catalog is the most extensive 80° trigon negative variant — 14 grade families, 11 chip-breaker variants, and 4 IC sizes (06, 08, 06T3, 08). The 12.7 mm IC (0804 / 0808 / 0812) is most common (50+ SKUs), with 9.5 mm and 6.0 mm IC for smaller work. Cast iron coverage is heavy with UC5115 / UC5105 / MC5015 / MC5005 / MC6025 / MC7025 grades.

Browse by Application & Grade

All 69 WN 80° zero-rake trigon SKUs are grouped below by application and grade. Click any category to filter the full catalog.

By Workpiece Material

• Cast Iron (K-grade) — WNMA UC5115, WNMG UC5115 / UC5105 / MC5015 / MC6025 (20+ SKUs)
• Stainless Steel (M-grade) — WNMG-MS / MA US735 / US7020 / MC7025 / MP735 (15+ SKUs)
• Carbon Steel / Alloy Steel (P-grade) — WNMG-MA UE6020 / UE6110 / UE6120 (15+ SKUs)
• Universal (steel + stainless) — WNMG-MA VP15TF (3 SKUs)
• Mirror Finishing — WNMG NX2525 (cermet)

By Operation

• Cast Iron Heavy Roughing — WNMA UC5115, WNMG-GK / GH UC5115 (free-cutting, strong edge)
• Steel Heavy Roughing — WNMG-GH UE6020 (interrupted cuts)
• Stainless Profiling — WNMG-MS US735 / MC7025 / MP735
• Steel High-Speed Profiling — WNMG-SA / -MA UE6110 (15-25 m/min)
• Mirror Finishing — WNMG NX2525 cermet
• Wiper High-Feed — WNMG-MW UC5115 (cast iron)

By Carbide Grade (14 families)

• CVD Cast Iron (K-grade) — UC5115 (K05-K20), UC5105 (K05-K10), MC5015 (K05-K15 high-speed), MC5005 (K05-K10), MC6025 (K10-K25), MC7025 (K05-K15 high-temp)
• CVD Stainless Steel (M-grade) — US735 (M10-M25), US7020 (M05-M15), MC7025 (M05-M15)
• PVD Stainless (M-grade) — MP735 (M10-M25, PVD Al-rich)
• PVD Universal (Miracle Coat) — VP15TF (P/M/S grades)
• CVD Steel (P-grade) — UE6020 (P20-P30), UE6110 (P15-P25 high-speed), UE6120 (P10-P20 high-precision)
• Cermet (Finishing) — NX2525 (P05-P15, mirror surface)

By Chip-Breaker (11 variants)

• MA (Medium All-round): General purpose, the most common (20+ SKUs).
• MS (Medium Semi-finishing): Lighter chip-breaker for finishing.
• MW (Wiper): Wiper geometry for high-feed cast iron turning.
• MP (Medium Profiling): Optimized for profiling operations.
• MK / MM: Specialty chip-breakers for stainless and cast iron.
• GK / GH (General/Heavy): Stronger chip-breaker for roughing and interrupted cuts.
• SA (Steel Aluminum): For high-speed steel turning.
• FP (Precision Finishing): Light chip-breaker for steel finishing.
• F (Sharp): Single-face sharp chip-breaker for cermet finishing.

How to Choose the Right WN 80° Zero-Rake Insert — 3-Step

Step 1 — Identify the Workpiece

• Cast iron (gray, ductile, CGI): WNMA flat-top with UC5115 / MC5015 (K-grade CVD), or WNMG-GK / -GH / -MW with UC5115 for high-feed cast iron.
• Stainless steel 304/316: WNMG-MS / -MA with US735 (M-grade CVD) or MC7025 (M-grade CVD high-temp) or MP735 (PVD M-grade).
• Carbon steel / alloy steel: WNMG-MA with UE6020 (P20-P30) or UE6110 (P15-P25 high-speed) or UE6120 (P10-P20 precision).
• Mirror finishing on steel: WNMG-F / -FP with NX2525 cermet.
• Universal (steel + stainless): WNMG-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.
• MW (Wiper): Wiper geometry for high-feed cast iron turning.
• MP (Medium Profiling): Optimized for profiling operations.
• GK / GH (General/Heavy): Stronger chip-breaker for roughing and interrupted cuts.
• SA (Steel Aluminum): For high-speed steel turning.
• FP / F (Sharp): For precision finishing with cermet.

Step 3 — Verify Holder Compatibility

• WN (80° zero-rake negative): Use MWLN-type holders (multi-lock, 80° lead angle). 0° clearance means the insert sits flat without any rake.
• Verify lead angle: 80° matches WNMG perfectly. Common holder: MWLNR/L 2020-K08 (8 mm IC), MWLNR/L 2525-M12 (12 mm IC).
• Match IC to holder pocket: WNMG 06 needs 6 mm pocket; WNMG 08 needs 8 mm pocket; WNMG 12 needs 12 mm pocket.

Frequently Asked Questions

Related Mitsubishi Inserts & Holders

Need a Specific WN 80° Trigon Insert Not in Stock?

69 in-stock SKUs covering WNMG / WNMA in 14 grades. For specialty WNGG (cermet sharp), WNMX, 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.