Korloy TNMG160408-HM NC3030 (TNMG 332-HM) Heavy Interrupted Steel Turning Insert (10pcs)
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The Original Korloy TNMG160408-HM NC3030 (ANSI: TNMG 332-HM) is the industry's premier choice for Difficult Steel Turning (P-Group) involving heavy impact. Engineered with the NC3030 High-Toughness Grade, this insert is specifically formulated to prevent catastrophic edge failure during Interrupted Cuts (such as keyways, holes, or square stock). The HM (Medium-Roughing) Chipbreaker and reinforced 0.8mm radius provide a stable platform for high material removal rates even under less-than-ideal machining conditions.
The Toughest Defense Against Chipping: When your workpiece is uneven or has heavy scale, standard "high-speed" grades often fail. NC3030 uses a specialized sub-micron substrate that absorbs mechanical shock, making it the most reliable tool for Cast Steels, Forgings, and Keyed Shafts.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 160408-HM |
| ANSI Designation | TNMG 332-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.8 mm / (1/32") |
| Grade | NC3030 (Maximum Impact Resistance CVD) |
Core Performance Benefits:
- Extreme Shock Resistance: Formulated to withstand the repeated pounding of heavy interruptions without micro-cracking.
- Enhanced Edge Security: The HM geometry features a wide land and high rake angle, balancing chip breaking with a very strong cutting edge.
- Reliable in Roughing: The 0.8mm (332) radius handles large feed rates and varied depths of cut with ease.
- Versatile Application: Performs exceptionally well on a wide range of materials from low carbon steels to high-strength alloy steels.
Recommended Cutting Parameters:
| Workpiece Condition | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Heavy Interrupted Steel | 110-180 m/min (360-590 sfm) | 0.15-0.45 mm/rev (.006-.018 ipr) | 0.8-4.0 mm (.032-.157") |
| Rough Castings/Forgings | 130-220 m/min (425-720 sfm) | 0.20-0.40 mm/rev (.008-.016 ipr) | 1.0-4.5 mm (.040-.177") |
Compatible Tooling Systems:
- Standard External Holders: MTJNR 2020K16 / MTJNR 2525M16 (ANSI 12-4B / 16-4D)
- Heavy Duty Boring Bars: S25S-WTJNR16 / S32T-WTJNR16
Machinist Tip: The "Problem Solver" Grade
When to reach for the TNMG160408-HM NC3030:
Best for Interrupted & Roughing. If your current tool is chipping or snapping, switch to this. It's designed to survive where others fail. Ideal for roughing passes on mill-scale or weld-prepped surfaces.
Best for Continuous Cuts. For clean round bars and high surface speeds, NC3020 is faster. Only use NC3030 when toughness is more important than speed.
Pro Advice: For heavy interruptions, reduce your cutting speed (Vc) by 20% but maintain a positive feed rate (fn). This keeps the tool engaged and prevents "rubbing" which causes rapid work-hardening and edge chipping.
Packaging: 10 pieces per box.
TNMG 160408-HM for heavy interrupted cutting, Korloy NC3030 vs NC3120 toughness, best insert for turning keyed shafts, TNMG 332-HM for rough steel castings, heavy duty shock resistant lathe inserts
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.