SUMITOMO TCMT110208N-SU AC630M Carbide Turning Insert | TCMT21.52 (7° Positive Triangular)
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1. Product Overview
Which 60° triangular turning insert provides the longest tool life, superior edge toughness, and reliable chip breaking when precision machining 304 and 316 stainless steels?
The SUMITOMO TCMT110208N-SU AC630M (ANSI designation: TCMT21.52) is a high-precision, 7° positive clearance triangular turning insert engineered by Sumitomo Electric Hardmetal. Built with the proprietary AC630M PVD Grade featuring Absotech® TiAlSiN multi-layer coating technology, this insert is specifically optimized for general-to-medium cut turning of stainless steels (ISO M15–M30) and exotic alloys under challenging thermal and mechanical stresses.
Utilizing the specialized 3D SU Chipbreaker Geometry, the TCMT110208N-SU excels at controlling springy stainless steel chips across light profiling, facing, and boring operations. Its sharp, low-cutting-resistance cutting edge suppresses work hardening and chatter, making it ideal for both Swiss-type automatic lathes and standard CNC turning centers.
ISO / ANSI Model Code Breakdown
2. Key Features
- Absotech® PVD Coating Technology: High-density TiAlSiN multi-layer PVD structure delivers exceptional oxidation resistance and ultra-low friction at high cutting temperatures.
- SU Stainless Steel Chipbreaker: Optimally angled rake face curling groove ensures continuous, stringy chips break into manageable C-shapes without burr generation.
- High-Toughness Substrate: Resists edge chipping and notch wear caused by work-hardened outer skin on austenitic stainless steel bars.
- Low Cutting Resistance: 7° positive clearance shape drastically lowers spindle torque and chatter on slim shafts and thin-walled workpiece structures.
- Dual ISO/ANSI Standard Fit: Fully standardized footprint compatible with all metric (STGCR/L 11) and imperial turning tools.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (ISO) | Imperial Unit (ANSI Equivalent) |
|---|---|---|
| Insert Designation | TCMT110208N-SU | TCMT21.52 |
| Inscribed Circle (IC) | 6.35 mm | 0.250" (1/4") |
| Thickness (S) | 2.38 mm | 0.094" (3/32") |
| Corner Radius (RE) | 0.8 mm | 0.031" (1/32") |
| Fixing Hole Diameter (d1) | 2.8 mm | 0.110" |
| Clearance Angle | 7° Positive | 7° Positive |
| Coating Structure | PVD (TiAlSiN Absotech®) | PVD (TiAlSiN Absotech®) |
| Manufacturer / Origin | SUMITOMO / Japan | SUMITOMO / Japan |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic Stainless (304, 316, 316L) | 120 - 200 m/min (390 - 655 SFM) |
0.08 - 0.22 mm/rev (0.003 - 0.009 ipr) |
0.50 - 2.50 mm (0.020 - 0.100") |
| Duplex Stainless Steel (2205, 2507) | 90 - 160 m/min (295 - 525 SFM) |
0.08 - 0.18 mm/rev (0.003 - 0.007 ipr) |
0.50 - 2.00 mm (0.020 - 0.080") |
| Heat-Resistant Superalloys (Inconel, Titanium) | 30 - 70 m/min (100 - 230 SFM) |
0.06 - 0.15 mm/rev (0.002 - 0.006 ipr) |
0.30 - 1.50 mm (0.012 - 0.060") |
Recommended Compatible Turning Toolholders & Boring Bars:
Fits all standard TCMT11 / TCMT21.5 holders: STGCR/L 1212H11, STGCR/L 1616H11, and A12M-STFCR11 boring bars.
Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Material Types | Performance Rating |
|---|---|---|---|
| M (Stainless Steel) | Primary Choice | AISI 304, 316, 316L, 17-4PH, Duplex 2205 | ★★★★★ (Optimal) |
| S (Superalloys / Ti) | Secondary Choice | Inconel 718, Titanium Grade 5 (Ti-6Al-4V) | ★★★★☆ (Excellent) |
| P (Steel) | Conditional | Low Carbon Steel, Mild Alloy Steel | ★★★☆☆ (Good) |
| K (Cast Iron) | Not Recommended | Gray Iron, Ductile Iron | ★☆☆☆☆ (Not Recommended) |
4. Applications
- External Precision Turning: Finishing and medium profiling of stainless steel shafts, valve stems, and medical fittings.
- Small-Bore Internal Boring: High-clearance internal boring on holes starting from 12 mm ID using STFCR/STGCR boring bars.
- Swiss Machining Operations: Ideal for automatic lathes requiring sharp cutting action and zero edge built-up edge (BUE).
5. Compatibility
Fully compliant with ISO 1832 and ANSI B212.4 standards. Mounts directly into turning holders and internal boring bars from Sumitomo, Kennametal, Sandvik Coromant, Iscar, Tungaloy, and Kyocera utilizing M2.5 clamp screws.
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent Insert Designation |
|---|---|---|
| SUMITOMO (Original) | AC630M (PVD) / AC6020M | TCMT110208N-SU |
| Sandvik Coromant | GC2015 / GC1115 | TCMT 11 02 08-MM |
| Iscar | IC907 / IC807 | TCMT 110208-SM |
| Kyocera | PR1125 / PR1225 | TCMT 110208HQ |
| Tungaloy | AH630 / AH645 | TCMT110208-PSS |
7. Why Choose Us
We supply 100% genuine Sumitomo Electric cutting tools sourced directly from authorized factory channels in Japan. Every batch features full lot traceability, precision dimensional tolerance verification, and factory-sealed anti-counterfeit packaging.
Verified Customer Reviews
Switched to AC630M for running 316L medical fittings on our Citizen Swiss lathes. Tool life doubled compared to our previous supplier, and chip breaking with the SU geometry is flawless.
Ausgezeichnete Wendeschneidplatte für Edelstahl 1.4404. Die Absotech-Beschichtung hält hohen Temperaturen stand ohne Ausbröckelung an der Schneidkante.
Inserti Sumitomo originali di altissima qualità. Il rompituciolo SU lavora benissimo sia in finitura che in sgrossatura media su AISI 304.
住友のAC630Mはステンレス加工において非常に安定しています。TCMT110208N-SUは刃先の耐摩耗性が高く、仕上げ面の面粗度が非常に綺麗に出ます。
Great positive triangular insert for our internal boring bars. Good chip control even at lower feeds.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Built-Up Edge (BUE) / Material Sticking | Cutting speed Vc is too low or cutting temperature is insufficient for PVD coating activation | Increase cutting speed Vc by 15-20% and ensure high-pressure coolant is directed at the cutting zone. |
| Notch Wear at Depth-of-Cut Line | Work-hardened surface layer of stainless steel wearing down the insert corner | Vary the depth of cut (ap) across passes or switch to an insert with a larger corner radius. |
| Vibration / Chatter Surface Marks | Workpiece setup flexibility or excessive overhang on internal boring bar | Reduce depth of cut (ap), shorten tool overhang, or select 0.4 mm corner radius (TCMT110204). |
According to ISO 513:2012 classification standards, SUMITOMO AC630M falls within the ISO M15–M30 range for stainless steels and ISO S15–S25 range for heat-resistant alloys, providing a balance of toughness and wear 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.