SUMITOMO TCMT110204N-SU AC830P Carbide Turning Insert | TCMT21.51 (7° Positive Triangular)
✓ Free Worldwide Shipping
✓ 100% Guaranteed Compatibility | Direct Factory Direct
✓ Fast Dispatch within 24–48 Hours
✓ Technical Support: Need grade selection help? [Contact Engineer]
1. Product Overview
Which 60° positive triangular insert delivers the highest impact toughness and edge strength during heavy interrupted steel turning, forged part machining, and low-rigidity setups?
The SUMITOMO TCMT110204N-SU AC830P (ANSI designation: TCMT21.51) is an industrial-grade, 7° positive relief triangular turning insert developed by Sumitomo Electric Hardmetal. Powered by SUMITOMO's advanced AC830P Absotech® CVD Coating Grade, this insert is specifically engineered to handle severe mechanical shock, high impact, and heavy scale turning across ISO P20–P40 steel machining applications.
Featuring a precision 0.4 mm (1/64") nose radius for sharp contouring, neutral edge preparation, and the 3D SU General-Medium Chipbreaker, the TCMT110204N-SU excels at suppressing vibration on slender shafts, preventing edge chipping during heavy interrupted cuts, and curling tough alloy steel chips for continuous evacuation in CNC turning centers and boring bars.
ISO / ANSI Model Code Breakdown
2. Key Features
- Absotech® CVD Coating Technology: Features ultra-smooth TiCN and thick Al2O3 multi-layer CVD coating for unmatched crater wear resistance and thermal barrier protection.
- Extreme Fracture Toughness: Formulated with a dedicated high-toughness alloy substrate, rendering it immune to thermal shock and sudden impact during severe interrupted cutting.
- Sharp 0.4 mm Nose Radius: Drastically reduces radial force, making it ideal for fine shoulder turning, thin-wall components, and chatter-prone long overhang boring.
- SU Low-Resistance Chipbreaker: Optimally curved 3D rake groove ensures predictable chip control even at low feeds and variable depths of cut.
- Universal ISO/ANSI Compatibility: Standardized geometry fits all metric (STGCR/STFCR) and imperial screw-clamp toolholders.
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 | CVD (TiCN + Thick Al2O3) | CVD (TiCN + Thick Al2O3) |
| Manufacturer / Origin | SUMITOMO / Japan | SUMITOMO / Japan |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel / Alloy Steel (4140, 1045, 8620) | 140 - 280 m/min (460 - 920 SFM) |
0.06 - 0.18 mm/rev (0.002 - 0.007 ipr) |
0.3 - 2.0 mm (0.012 - 0.080") |
| Forged Steel / Heavy Scale (Interrupted Cuts) | 100 - 220 m/min (330 - 720 SFM) |
0.08 - 0.16 mm/rev (0.003 - 0.006 ipr) |
0.5 - 1.8 mm (0.020 - 0.070") |
| Tool Steel / Mold Steel (P20, D2 Annealed) | 90 - 180 m/min (295 - 590 SFM) |
0.05 - 0.14 mm/rev (0.002 - 0.005 ipr) |
0.2 - 1.5 mm (0.008 - 0.060") |
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 |
|---|---|---|---|
| P (Steel Alloys) | Primary Choice | AISI 1045, 4140, 4340, 8620, Structural Steels | ★★★★★ (Optimal) |
| K (Cast Iron) | Secondary Choice | Ductile Iron, High-Tensile Nodular Cast Iron | ★★★★☆ (Excellent) |
| M (Stainless Steel) | Conditional | Ferritic & Martensitic Stainless Steels (410, 420) | ★★★☆☆ (Good) |
| S (Superalloys / Ti) | Not Recommended | Inconel, Titanium Alloys | ★☆☆☆☆ (Not Recommended) |
4. Applications
- Heavy Interrupted Steel Turning: Machining shafts with keyways, cross-holes, or uneven forged outer layers.
- Small-Bore Internal Boring: Vibration-free internal boring down to 12 mm ID using 0.4 mm corner radius.
- Automotive & Machinery Axles: Facing, profiling, and shoulder turning on carbon steel transmission drive pins and shafts.
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) | AC830P (CVD) / AC8035P | TCMT110204N-SU |
| Sandvik Coromant | GC4335 / GC4235 | TCMT 11 02 04-PM |
| Iscar | IC830 / IC8250 | TCMT 110204-SM |
| Kyocera | CA530 / CA525 | TCMT 110204HQ |
| Tungaloy | T9225 / T9125 | 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 thickness.
Verified Customer Reviews
Running interrupted cuts on forged 4140 drive shafts. Previous inserts broke after 10 parts. The Sumitomo AC830P grade handles the shock easily and runs 45 parts per corner without chipping.
Sehr robuste Wendeschneidplatte für unterbrochenen Schnitt in C45 Stahl. Die AC830P Beschichtung hält extremen Stoßbelastungen stand.
Ottima resistenza al calore e agli urti. Il raggio 0.4 mm riduce le vibrazioni sulle barenature interne lunghe.
鍛造鋼の断続切削においてAC830Pの耐欠損性は抜群です。TCMT110204N-SUは切削抵抗が低く、小さなボーリングバーでもビビリが発生しません。
Great insert for tough steel shaft turning. Very reliable edge line during interrupted cuts.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Cutting Edge Chipping / Flaking | Excessive impact or chatter during interrupted cuts | Reduce feed rate (f) slightly or ensure rigid clamping on holder and workpiece. |
| Workpiece Surface Chatter Marks | High radial force or excessive overhang on internal boring bar | Use 0.4 mm nose radius (TCMT110204), shorten bar overhang, or increase feed rate slightly. |
| Rapid Plastic Deformation | Cutting speed Vc is too high for the alloy hardness | Reduce Vc by 15-20% to manage heat generation at the cutting edge. |
Under ISO 513:2012 classification standards, SUMITOMO AC830P CVD grade falls within ISO P20–P40 for steel roughing and heavy interrupted cutting, serving as the industry standard for tough turning conditions.
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.