SUMITOMO TCMT16T308N-SU AC630M CVD Carbide Insert | TCMT32.52N-SU
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1. Product Overview
Which positive turning insert is best suited for general-purpose medium cutting and interrupted turning on austenitic and duplex stainless steels without built-up edge or thermal cracking?
The SUMITOMO TCMT16T308N-SU AC630M (ANSI designation: TCMT32.52N-SU AC630M) is a high-performance 60° triangular single-sided indexable turning insert featuring a 7° positive clearance angle for reduced cutting forces. Powered by SUMITOMO's AC630M CVD Coating Grade—utilizing Absotech technology with a tough TiCN/Al2O3 composite CVD coating layered over a high-toughness carbide substrate—this insert excels at resisting notch wear, thermal shock, and edge chipping under general to interrupted cutting conditions across ISO M15–M35, P15–P35, and S15–S30 ranges.
Featuring a versatile 0.8 mm (1/32") corner radius, a Neutral (N) cutting direction, and the general-purpose SU Medium-Cut Chipbreaker, this insert guarantees active chip breaking across medium cutting depths (ap: 0.8–3.0 mm) and moderate feed rates (f: 0.12–0.30 mm/rev). The positive rake geometry drastically cuts cutting loads and heat buildup, making it the ideal choice for internal boring bars and low-rigidity external shank holders on CNC turning centers.
ISO / ANSI Designation Breakdown
2. Key Features
- Absotech CVD AC630M Grade: High-adhesion TiCN and thick Al2O3 multi-layer coating provides thermal insulation and oxidation resistance for long tool life in stainless steel turning.
- 7° Positive Relief Geometry: Significantly reduces cutting forces and deflection, making it suitable for long internal boring bars and lower horsepower machines.
- SU General-Purpose Chipbreaker: Optimizes chip flow across a wide depth-of-cut range, preventing chip clogging in blind bore operations.
- 0.8 mm Durable Nose Radius: Provides structural edge strength against impact during light interrupted cuts and medium roughing passes.
- Universal ISO Application: Delivers balanced wear resistance and fracture toughness across stainless steel, steel alloys, and high-temp alloys.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (ISO Standard) | Imperial Unit (ANSI Standard) |
|---|---|---|
| Insert Designation | TCMT16T308N-SU | TCMT32.52N-SU |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 3.97 mm | 0.156" (5/32") |
| Corner Radius (RE) | 0.8 mm | 0.0315" (1/32") |
| Hole Diameter (D1) | 4.40 mm | 0.173" |
| Substrate Grade | Absotech CVD Coated (AC630M) | Absotech CVD Coated (AC630M) |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Stainless Steel (304, 316, 2205 Duplex) | 120 - 220 m/min (390 - 720 SFM) |
0.12 - 0.30 mm/rev (0.005 - 0.012 ipr) |
0.8 - 3.0 mm (0.031 - 0.118 in) |
| Alloy Steel (4140, 8620, 4340) | 140 - 260 m/min (460 - 850 SFM) |
0.15 - 0.32 mm/rev (0.006 - 0.013 ipr) |
1.0 - 3.2 mm (0.039 - 0.126 in) |
| Heat Resistant Alloys (Inconel, Hastelloy) | 40 - 85 m/min (130 - 280 SFM) |
0.10 - 0.22 mm/rev (0.004 - 0.009 ipr) |
0.5 - 2.0 mm (0.020 - 0.078 in) |
Recommended Compatible Toolholders (ISO Screw Clamp Turning & Boring Holders):
Compatible with standard toolholders: STGCR/L 2020K16, STFCR/L 2020K16, Internal Boring Bars: A16M-STFCR16, S20R-STFCR16
Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Grade Examples | Performance Rating |
|---|---|---|---|
| M (Stainless Steel) | Primary Choice | 304, 316, 316L, 17-4PH, 2205 Duplex | ★★★★★ (Optimal) |
| P (Steel) | Primary Choice | Carbon Steel 1045, Alloy Steel 4140, 4340 | ★★★★★ (Optimal) |
| S (Exotic Alloys) | Secondary Choice | Inconel 718, Hastelloy C276, Titanium | ★★★☆☆ (Good) |
| K (Cast Iron) | Conditional | Ductile Iron, Gray Cast Iron | ★★☆☆☆ (Limited) |
4. Applications
- Medium External Turning & Facing: General machining of stainless shafting, flanges, and structural steel components.
- Internal ID Boring Operations: Deep hole boring using positive relief TCMT inserts to prevent chatter and chip packing.
- Interrupted Medium Machining: Turning keyway-featured shafts or forged components requiring high edge strength against micro-impacts.
5. Compatibility
This insert fits all standard ISO positive screw-clamp turning shanks and boring bars (STGCR/L, STFCR/L, STUCR/L). Fully compatible with CNC lathes and turning centers from Haas, Mazak, Okuma, Doosan/DN Solutions, Hardinge, and Hyundai WIA.
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent ISO Insert Designation |
|---|---|---|
| SUMITOMO (Original) | AC630M (Tough CVD) / AC6020M | TCMT16T308N-SU |
| Sandvik Coromant | GC2025 / GC1115 | TCMT16T308-MM / TCMT32.52-MM |
| Kyocera | CA6525 / PR1535 | TCMT16T308HQ / TCMT32.52HQ |
| Tungaloy | AH630 / T6130 | TCMT16T308-PSS |
| Iscar | IC907 / IC807 | TCMT 16T308-SM |
7. Why Choose Us
We deliver 100% genuine SUMITOMO Electric Hardmetal indexable cutting tools directly through authorized industrial channels. Quality assurance procedures ensure consistent substrate integrity and precise coating adhesion for high-reliability automated manufacturing.
Verified Customer Reviews
AC630M is my go-to grade for 316L stainless boring bars. The positive 7-degree relief stops chatter completely inside deep bores, and the SU chipbreaker breaks chips cleanly.
Sehr zuverlässige Schneidplatte für Edelstahl. Die Standzeit bei unterbrochenem Schnitt auf 1.4404 ist beeindruckend.
Ottima placchetta per tornitura interna. Il grado AC630M resiste benissimo al calore senza scheggiarsi sul bordo.
SUS304の加工で長年愛用しています。AC630Mは耐境界摩耗性が高く、安定した工具寿命が得られます。
Running these TCMT 16T308 inserts on duplex stainless shaft sleeves. Solid edge strength with good surface finishes.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Workpiece Thermal Cracking / Spalling | Thermal shock caused by erratic or dry coolant delivery | Ensure high-volume, continuous coolant stream or consider running dry with air blow if high speed permits. |
| Built-Up Edge (BUE) / Adhesion | Cutting speed Vc is too low for stainless steel shearing | Increase cutting speed Vc by 15-20% to reach the optimal temperature zone for the AC630M CVD coating. |
| Vibration / Chatter in Boring | Bar overhang is too long relative to bar diameter | Reduce overhang ratio, reduce depth of cut ap slightly, or increase feed rate f to stabilize tool pressure. |
In accordance with ISO 513:2012 classification standards, SUMITOMO AC630M Absotech CVD coated grade provides thermal shock barrier protection and high fracture toughness across ISO M15–M35 stainless steel and ISO P15–P35 alloy steel turning environments.
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.