SUMITOMO TCMT16T304N-SU AC630M CVD Carbide Insert | TCMT32.51N-SU
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1. Product Overview
Which positive turning insert is best suited for high-speed medium turning and compact boring operations in steel where strong edge toughness, low cutting force, and superior flank wear resistance are required?
The SUMITOMO TCMT110208N-SU AC820P (ANSI designation: TCMT21.52N-SU AC820P) is a compact, high-productivity 60° triangular single-sided indexable turning insert engineered with a 7° positive clearance angle to minimize cutting forces and chatter on smaller shanks and internal boring bars. Powered by SUMITOMO's flagship AC820P Absotech Platinum CVD Coating Grade—featuring a dense, ultra-smooth TiCN and nano-textured Al2O3 multi-layer structure over a tough carbide substrate—this insert delivers outstanding crater wear and thermal shock resistance during high-speed turning across ISO P05–P25 carbon and alloy steel ranges.
Featuring a durable 0.8 mm (1/32") corner radius, Neutral (N) edge prep, and the versatile SU Medium-Cut Chipbreaker, this insert handles higher feed rates and heavier depth of cuts without sacrificing edge integrity, making it an essential choice for Swiss-type lathes, small CNC turning centers, and internal boring bars.
ISO / ANSI Designation Breakdown
2. Key Features
- Absotech Platinum AC820P CVD Coating: Ultra-smooth coating topography reduces chip friction and heat build-up, extending insert tool life by up to 2x at high cutting speeds.
- Robust 0.8 mm Corner Radius: Provides higher nose toughness and edge strength, allowing higher feed rates (up to 0.28 mm/rev) while maintaining structural integrity.
- 7° Positive Relief Geometry: Substantially cuts radial pressure, preventing chatter on slim boring bars and Swiss-style tool posts.
- SU Medium-Cut Chipbreaker: Formed rake face breaks steel chips into tight, manageable curls over a wide depth of cut range (ap: 0.5–2.5 mm).
- High Thermal Shock & Flank Resistance: Formulated to withstand heat cycles during high-speed continuous turning without premature edge chipping.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (ISO Standard) | Imperial Unit (ANSI Standard) |
|---|---|---|
| Insert Designation | TCMT110208N-SU | TCMT21.52N-SU |
| 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 | 0.0312" (1/32") |
| Hole Diameter (D1) | 2.80 mm | 0.110" |
| Substrate Grade | Absotech Platinum CVD (AC820P) | Absotech Platinum CVD (AC820P) |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045, 1018, A36) | 180 - 350 m/min (590 - 1150 SFM) |
0.10 - 0.28 mm/rev (0.004 - 0.011 ipr) |
0.5 - 2.5 mm (0.020 - 0.098 in) |
| Alloy Steel (4140, 4340, 8620) | 150 - 300 m/min (490 - 980 SFM) |
0.10 - 0.25 mm/rev (0.004 - 0.010 ipr) |
0.5 - 2.2 mm (0.020 - 0.086 in) |
| Die Steel / Tool Steel (P20, H13 Annealed) | 120 - 240 m/min (390 - 780 SFM) |
0.08 - 0.20 mm/rev (0.003 - 0.008 ipr) |
0.4 - 1.8 mm (0.015 - 0.070 in) |
Recommended Compatible Toolholders (ISO Screw Clamp Turning & Boring Holders):
Compatible with standard external holders: STGCR/L 1212H11, STFCR/L 1212H11, Internal Boring Bars: A10K-STFCR11, S12M-STFCR11
Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Grade Examples | Performance Rating |
|---|---|---|---|
| P (Steel) | Primary Choice | 1045 Carbon Steel, 4140 Alloy Steel, 8620 Steel | ★★★★★ (Optimal) |
| K (Cast Iron) | Secondary Choice | Ductile Iron, Nodular Cast Iron (Light medium turning) | ★★★☆☆ (Good) |
| M (Stainless Steel) | Conditional | 410, 420 Ferritic/Martensitic Stainless Steels | ★★☆☆☆ (Limited) |
| S (Exotic Alloys) | Not Recommended | Inconel, Titanium Alloys | ★☆☆☆☆ (Not Recommended) |
4. Applications
- Small-Bore Internal Boring: High-rigidity internal turning on 10mm and 12mm shank boring bars without chatter.
- Swiss Lathe & Compact Turning: Medium turning and facing on small-diameter precision carbon and alloy steel components.
- High-Feed Steel Medium Cutting: Roughing and semi-finishing operations requiring a durable 0.8 mm nose radius.
5. Compatibility
Fits all standard ISO positive screw-clamp external toolholders (STGCR/L, STFCR/L 11 size) and internal boring bars (A/S-STFCR/L 11 size). Fully compatible with standard CNC turning machines, lathes, and Swiss-type automatics from Haas, Mazak, Doosan/DN Solutions, Citizen, Star, and Hardinge.
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent ISO Insert Designation |
|---|---|---|
| SUMITOMO (Original) | AC820P (Absotech) / AC8025P | TCMT110208N-SU |
| Sandvik Coromant | GC4325 / GC4425 | TCMT110208-PM / TCMT21.52-PM |
| Kyocera | CA5525 / CA315 | TCMT110208HQ / TCMT21.52HQ |
| Tungaloy | T9215 / T9125 | TCMT110208-PSS |
| Iscar | IC807 / IC8150 | TCMT 110208-SM |
7. Why Choose Us
We supply 100% genuine SUMITOMO Electric Hardmetal cutting tools directly through factory-authorized inventory channels. Every batch is verified for coating thickness, radius profile accuracy, and edge honing consistency for flawless CNC automated production.
Verified Customer Reviews
We switched to TCMT110208N-SU AC820P on our Citizen Swiss lathes for 4140 steel pins. The 0.8mm radius gives great corner strength and wear life is twice as long as our previous brand.
Sehr gute Wendeplatte für kleine Ausdrehstangen. AC820P liefert auch bei hohen Schnittgeschwindigkeiten minimale Freiflächenverschleiß.
Ottimo inserto per tornitura interna ed esterna di acciai legati. Rompitruciolo SU molto versatile anche con passate fino a 2 mm.
TCMT110208のAC820Pは安定感抜群です。小型自動盤での鉄系被削材加工において長寿命でコストパフォーマンス最高です。
Solid performance on 1045 steel shafts. The 0.8 radius handles higher feed rates without burning the corner edge.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Flank Wear Accelerating Rapidly | Cutting speed Vc exceeds optimal range or cooling is insufficient | Lower cutting speed Vc by 10-15% or verify flood coolant pressure at the cutting zone. |
| Tool Vibration / Chatter Marks | Feed rate f is too high for the 0.8mm radius or boring bar overhang is excessive | Reduce feed rate slightly or decrease depth of cut ap to lower radial pressure. |
| Long Ribbon Chips Wrapping Tool | Depth of cut ap is too shallow to engage the SU chip breaker wall | Increase depth of cut ap above 0.5 mm to allow active chip curling. |
Under ISO 513:2012 classification standards, SUMITOMO AC820P Absotech Platinum CVD coated grade delivers top-tier performance for medium-to-high speed turning of ISO P05–P25 carbon steels and alloy steels.
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.