Tungaloy Negative Turning Inserts | CNMG DNMG WNMG | CNCHome

About Tungaloy Negative Turning Inserts

Tungaloy negative turning inserts are precision-engineered carbide tools for heavy-duty CNC turning of steel, stainless, cast iron, and heat-resistant alloys. Negative inserts (N designation) have a hole in the center and can be flipped to expose a fresh cutting edge, doubling tool life compared to positive inserts. Tungaloy's negative insert family — CNMG (80° diamond), DNMG (55° diamond), WNMG (80° trigon), TNMG (60° triangle), and SNMG (90° square) — covers the full spectrum of roughing to finishing operations on medium-to-large workpieces.

Every Tungaloy insert on this page is genuine OEM product from Tungaloy Corporation (Japan, est. 1929, part of IMC Group), shipped with full lot traceability. CNCHome-Beyond is an authorized Tungaloy distributor; orders placed before 3 PM China time ship same-day from our Hangzhou warehouse with DHL/UPS/FedEx express delivery in 3-7 business days.

Tungaloy Negative Insert Geometries at a Glance

Need to compare with other brand geometries? See our complete Insert Grade Cross-Reference Tool and SKU Cross-Reference for direct equivalents between Tungaloy, Mitsubishi, Sandvik, Kennametal, Iscar, Walter, and SECO.

Tungaloy Grade Reference for Negative Turning

Tungaloy Chip-Breaker Reference

Chip-breaker geometry determines chip control, surface finish, and depth-of-cut capability. Tungaloy negative inserts ship with these chip-breakers:

How to Choose a Tungaloy Negative Insert

Step 1: Match the geometry to operation. For profiling and 55° approach angles, choose DNMG. For heavy roughing on steel with high feed rates, choose CNMG in 19mm IC. For small-diameter work where insert clearance is limited, choose WNMG 08mm. For hardened steel finishing (HRC 55+), choose CNGA ceramic.

Step 2: Match the grade to material. Steel → T9125 (general), T9115 (finishing), T9200 (heavy roughing). Stainless → AH725. Hardened steel or high-temp alloys → LX11 ceramic. Precision finishing on steel → NS9530 cermet.

Step 3: Match the chip-breaker to depth of cut. Light finishing (0.2-1.5mm) → TS or 37. Medium (1.5-4mm) → TM. Heavy (3-8mm) → TH or THS. Use the table above to find the right combination.

Step 4: Match the holder. Tungaloy negative inserts fit the Mitsubishi/Tungaloy standard DCLNR/L, MCLNR/L, MWLNR/L, MDJNR/L, PCBNR/L tool holder families. CNCHome-Beyond carries compatible aftermarket holders at 30-50% below OEM — see our turning tool holder guide and use the Insert Holder Selector.

Compatible Tool Holders

Tungaloy negative inserts fit the following CNCHome-Beyond tool holder families (all ISO 5608 standard):

• Double-Clamp External Holders — for heavy CNMG/DNMG roughing
• Multi-Lock External Holders — for general CNMG/DNMG medium cutting
• Lever-Lock (P-Type) External Holders — for quick-change high-mix production
• Screw-Clamp Boring Bars — for internal turning with negative inserts
• Multi-Lock Boring Bars — for ID turning applications

Cross-Brand Equivalents to Tungaloy Negative Geometries

Tungaloy negative insert geometries are dimensionally interchangeable with other major brands. Direct equivalents:

Looking for a Mitsubishi or Sandvik equivalent at lower cost? See Mitsubishi negative turning inserts or Kyocera negative turning inserts for direct alternatives, and use our Insert Grade Cross-Reference Tool for grade-to-grade equivalents.

Frequently Asked Questions

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