ZCC-CT TNMG160412 YBM251 CVD Coated Carbide Turning Insert | 10 Pcs/Box
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ZCC-CT TNMG160412 YBM251 Inserts
Stainless Steel Continuous Turning & Heavy Feed Machining | YBM251 CVD Coated Grade | Box of 10 Pcs
"Which negative triangular CVD-coated carbide insert with a 1.2mm corner radius is best for continuous medium-to-heavy turning, thermal wear resistance, and high-feed stock removal in austenitic and martensitic stainless steels?"
The ZCC-CT TNMG160412 YBM251 is a high-durability, double-sided, negative-rake 60° triangular turning insert engineered specifically for continuous medium-to-heavy turning, semi-roughing, and high-feed external/internal profiling across austenitic and martensitic stainless steels (ISO M) as well as alloy steels. Powered by ZCC-CT's dedicated YBM251 multi-layer CVD coated carbide grade—combining a tough, crack-resistant gradient tungsten carbide substrate with a thick, smooth TiCN-Al2O3 chemical vapor deposition (CVD) coating—this insert delivers exceptional thermal barrier protection and resistance against crater wear, flank wear, and plastic deformation during sustained high-temperature stainless steel production runs. Unlike thin PVD coatings optimized for lower-speed interrupted cuts or light finishing, thick multi-layer CVD coatings on YBM251 insulate the cutting edge against intense heat buildup in continuous stainless steel machining. Paired with a rugged 1.2mm nose radius and a double-sided negative chip-control land, it provides maximum corner strength, prevents edge chipping under heavy feed rates, and delivers predictable tool life. Whether you are exploring the full ZCC-CT brand catalog, visiting our ZCC-CT technical hub, browsing ZCC-CT CNC carbide inserts and milling tools, or comparing negative turning inserts and positive turning inserts, the TNMG160412 YBM251 guarantees dependable shop floor performance. Expand your tooling selection across ZCC-CT TNMG, 60° triangular inserts, and ZCC-CT TNMX collections, or compare global brands via TaeguTec TNMG, Korloy TNMG, and Tungaloy TNMG/TNMA catalogs. For engineering guidance, review our resources on grade cross-reference, chipbreaker families, carbide insert nose radius, stainless steel speeds and feeds, how to choose turning insert geometry, what is a turning holder, inserts by material, inserts by operation, and top global CNC insert brands.
Core Engineering Advantages
YBM251 Multi-Layer CVD Grade
Thick TiCN-Al2O3 chemical vapor deposition (CVD) coating over a tough gradient substrate provides superior heat insulation and flank wear resistance in stainless steel.
Double-Sided Chip-Control Geometry
Reinforced edge land with molded chipbreaker grooves on both faces controls stringy stainless steel chips across medium-to-heavy depths of cut.
1.2mm Radius & 60° Triangle Economy
Double-sided 60° triangular design delivers 6 indexable cutting edges with a rugged 1.2mm corner radius for maximum edge strength under high feed rates.
ISO Code Specification Breakdown
Technical Specifications & Dimensional Comparison
| Parameter | Metric (Standard) | Imperial Equivalent |
|---|---|---|
| ISO / ANSI Designation | TNMG 160412 | TNMG 333 (Approx.) |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Cutting Edge Length (L) | 16.50 mm | 0.6496" (~21/32") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (RE) | 1.20 mm | 0.0472" (approx. 3/64") |
| Grade & Coating | YBM251 (Multi-Layer CVD Coated Carbide) | Stainless Steel CVD Coated Grade |
Recommended Cutting Parameters
*Values are starting recommendations for continuous medium-to-heavy turning in stainless steels with YBM251 CVD grade.
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (Ap) |
|---|---|---|---|
| Austenitic Stainless Steels (M - 304 / 316L) | 140 - 240 m/min | 0.20 - 0.45 mm/rev | 1.00 - 4.00 mm |
| Ferritic & Martensitic Stainless Steels (410 / 420) | 150 - 260 m/min | 0.20 - 0.48 mm/rev | 1.00 - 4.20 mm |
| Alloy & Carbon Steels (P - 4140 / 1045) | 170 - 300 m/min | 0.22 - 0.50 mm/rev | 1.20 - 4.50 mm |
Compatible Tool Holders & Boring Bars
Pair these precision 16-size negative triangular inserts with rigid external turning toolholders and internal boring bars including the MTQNR2020K16 90° Turning Tool Holder, MTQNR2525M16 External Turning Tool Holder, MTWNR2020K16 External Turning Holder, and Beyond S16Q-STFNR16 Internal Boring Bar.
Browse complete holder families via Beyond screw-type external turning tool holders and screw-on system boring bars.
Industrial Applications
- High-Speed Stainless Steel Medium-to-Heavy Turning: Multi-layer CVD YBM251 grade resists intense thermal loads and crater wear during continuous production turning of 304 and 316L stainless steel bars, flanges, and forgings.
- High-Feed External Profiling & Facing: Rugged 1.2mm nose radius maximizes corner strength and enables higher feed rates without premature nose fracture.
- Multi-Brand Tooling Consolidation: Fully compatible with standard ISO negative 60° triangular turning toolholders across ZCC-CT TNMG, TaeguTec TNMG, and Korloy TNMG systems.
ZCC-CT Grade Selection Matrix
Selecting the optimal ZCC-CT turning grade for negative inserts:
- YBM251 (Featured - Multi-Layer CVD Coated Stainless Grade): Smooth TiCN-Al2O3 CVD coated carbide engineered for continuous medium-to-heavy turning and high-speed machining in stainless steels (ISO M) where thermal barrier protection is essential.
- YBM253 (CVD Coated Tough Stainless Grade): Tougher multi-layer CVD coated grade optimized for heavy roughing and interrupted cuts in stainless steels.
- YBG205 (Nano-PVD Coated Grade): Specialized TiAlN nano-PVD coated grade designed for light finishing, lower cutting speeds, and superalloy turning (ISO M / ISO S) requiring an acute cutting edge.
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Technical Engineering Support
On-staff tooling specialists available for speed and feed recommendations.
Frequently Asked Questions
Q: When should I choose CVD grade YBM251 instead of PVD grades like YBG205 for stainless steel?
A: Choose YBM251 multi-layer CVD coated inserts for continuous medium-to-heavy turning of stainless steels at higher cutting speeds, where thick thermal insulation prevents crater wear and plastic deformation. Choose PVD grade YBG205 for light finishing, low-speed cuts, or interrupted machining where a sharper edge is needed.
Q: Why select a 1.2mm corner radius (TNMG160412) over a 0.4mm or 0.8mm radius?
A: A 1.2mm nose radius provides maximum corner strength, allowing higher feed rates and deeper depths of cut without nose chipping while producing a smoother theoretical surface finish at higher feeds.
Q: How many cutting edges are available on each TNMG1604 insert?
A: Being a double-sided negative 60° triangular insert, TNMG 1604 provides 6 indexable cutting edges (3 on the top face and 3 on the bottom face), maximizing tool economy.
Need Help With ZCC·CT Inserts?
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This ZCC·CT insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
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