SUMITOMO TCMT110204N-SU AC630M Stainless Steel Turning Insert | TCMT21.51 (7° Positive Triangular)
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1. Product Overview
Which 60° positive triangular insert offers the highest resistance to built-up edge and notch wear when turning austenitic stainless steels (304, 316) under light-to-medium interrupted cutting conditions?
The SUMITOMO TCMT110204N-SU AC630M (ANSI designation: TCMT21.51) is an industrial-grade, 7° positive relief triangular turning insert developed by Sumitomo Electric Hardmetal. Powered by SUMITOMO's advanced AC630M Absotech® Bronze PVD Coating Grade, this insert is specifically engineered to eliminate work hardening, built-up edge (BUE), and notch wear across ISO M20–M30 stainless steel and heat-resistant superalloy applications.
Featuring a precision 0.4 mm (1/64") nose radius for fine profiling, neutral edge preparation, and the 3D SU General-Medium Chipbreaker, the TCMT110204N-SU excels at suppressing cutting forces, preventing chatter in long-overhang boring bars, and curling sticky stainless steel chips for continuous evacuation in CNC turning centers.
ISO / ANSI Model Code Breakdown
2. Key Features
- Absotech® Bronze PVD Coating Technology: Utilizes a nano-multilayer TiAlSiN PVD coating with ultra-high adhesion strength to prevent boundary notch wear and edge chipping.
- Built-Up Edge (BUE) Resistance: Features a smooth surface top layer that drastically reduces welding when machining sticky materials like 304 and 316L stainless steel.
- Sharp 0.4 mm Nose Radius: Minimizes radial push forces, enabling smooth surface finishes on thin-walled components and long-overhang boring operations.
- SU Low-Resistance Chipbreaker: Uniquely curved 3D rake angle ensures positive cutting action and consistent chip evacuation even at low feed rates.
- Universal ISO/ANSI Compatibility: Standardized geometry fits all metric (STGCR/STFCR) and imperial screw-clamp toolholders and internal boring bars.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (ISO Standard) | Imperial Unit (ANSI Standard) |
|---|---|---|
| Insert Designation | TCMT110204N-SU | TCMT21.51 |
| Inscribed Circle (IC) | 6.35 mm | 0.250" (1/4") |
| Thickness (S) | 2.38 mm | 0.094" (3/32") |
| Corner Radius (RE) | 0.4 mm | 0.0156" (1/64") |
| Hole Diameter (D1) | 2.8 mm | 0.110" |
| Relief Angle | 7° Positive | 7° Positive |
| Coating Structure | PVD (Absotech® TiAlSiN) | PVD (Absotech® TiAlSiN) |
| Manufacturer / Origin | SUMITOMO / Japan | SUMITOMO / Japan |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic Stainless Steel (304, 316, 316L) | 120 - 220 m/min (390 - 720 SFM) |
0.06 - 0.16 mm/rev (0.002 - 0.006 ipr) |
0.3 - 1.8 mm (0.012 - 0.070") |
| Duplex & PH Stainless Steel (2205, 17-4PH) | 90 - 170 m/min (295 - 560 SFM) |
0.05 - 0.14 mm/rev (0.002 - 0.005 ipr) |
0.3 - 1.5 mm (0.012 - 0.060") |
| Low-Carbon & Alloy Steel (Interrupted) | 140 - 260 m/min (460 - 850 SFM) |
0.08 - 0.18 mm/rev (0.003 - 0.007 ipr) |
0.4 - 2.0 mm (0.016 - 0.080") |
Recommended Compatible Turning Holders & Boring Bars:
Fits all standard ISO screw-clamp external holders: STGCR/L 1212H11, STFCR/L 1616H11, and Internal Boring Bars: A12M-STFCR11, S12M-STFCR11
Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Grade Examples | Performance Rating |
|---|---|---|---|
| M (Stainless Steel) | Primary Choice | AISI 304, 316, 316L, 17-4PH, 2205 Duplex | ★★★★★ (Optimal) |
| P (Steel Alloys) | Secondary Choice | Carbon Steels, Low Alloy Steels, Forged Steel | ★★★★☆ (Excellent) |
| S (Superalloys / Ti) | Conditional | Inconel 718, Titanium Grade 5 (Ti-6Al-4V) | ★★★☆☆ (Good) |
| K (Cast Iron) | Not Recommended | Gray Iron, Nodular Iron | ★☆☆☆☆ (Not Recommended) |
4. Applications
- Stainless Steel Shaft & Valve Turning: Machining medical, marine, and food-grade components in 304/316 alloys.
- Small Internal Boring Operations: Precision boring in holes down to 12 mm ID using positive 7° clearance and 0.4 mm nose radius.
- Interrupted Milling & Turning Parts: Handling keyways, hex heads, and forged surfaces on stainless steel pump components.
5. Compatibility
Fully compliant with ISO 1832 and ANSI B212.4 international standards. Directly mounts into positive screw-clamp toolholders and boring bars from Sumitomo, Kennametal, Sandvik Coromant, Iscar, Tungaloy, and Kyocera utilizing standard M2.5 Torx screws.
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent ISO Insert Designation |
|---|---|---|
| SUMITOMO (Original) | AC630M (PVD) / AC6030M | TCMT110204N-SU |
| Sandvik Coromant | GC1115 / GC2015 | TCMT 11 02 04-MM |
| Iscar | IC907 / IC807 | TCMT 110204-SM |
| Kyocera | PR1535 / PR1320 | TCMT 110204HQ |
| Tungaloy | AH630 / AH645 | TCMT110204-PSS |
7. Why Choose Us
We supply 100% factory-original SUMITOMO Electric Hardmetal cutting tools imported directly from Japan. Every shipment comes in factory-sealed anti-counterfeit packaging with guaranteed dimensional lot tolerances and certified coating performance.
Verified Customer Reviews
Switched to AC630M for turning 316L stainless fittings. Built-up edge used to pull our corner radius off after 15 parts. These Sumitomo inserts easily run 60 parts per corner with clean surface finishes.
Hervorragende Standzeit bei der Bearbeitung von V4A (1.4571). Keinerlei Ausbrüche an der Schneidkante bei leichtem Unterbrechungsschnitt.
Ottima truciolabilità su acciaio inossidabile. Il rompitruciolo SU mantiene i trucioli corti ed evita l'attorcigliamento sul mandrino.
SUS304の加工でAC630Mを使用しています。構成刃物が付きにくく、仕上げ面が非常に安定しています。11サイズのTCMTとして最高の耐久性です。
Solid insert for 17-4PH stainless. Good chip control on thin passes and very smooth cutting action.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Notch Wear / Edge Flaking | Work hardening of stainless steel at depth of cut line | Vary depth of cut (ap) slightly or increase feed rate (f) to cut beneath hardened layer. |
| Built-Up Edge (BUE) / Chipping | Cutting speed Vc is too low, causing material welding | Increase Vc by 15-20% and ensure high-pressure coolant delivery. |
| Continuous Stringy Chips Wrapping Tool | Depth of cut or feed rate is below the SU chipbreaker activation range | Increase feed rate above 0.08 mm/rev or select a more aggressive chipbreaker. |
Under ISO 513:2012 classification standards, SUMITOMO AC630M PVD grade falls within ISO M20–M30 for stainless steel turning and ISO P20–P30 for steel interrupted cutting, serving as the industry benchmark for toughness and adhesion resistance.
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.