ZCC.CT CNMG120404-DM YBM251 Carbide Turning Inserts for Stainless Steel
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ZCC.CT CNMG120404-DM YBM251: Precision Turning for Stainless Steel
Product Overview
"Which insert grade is the best all-rounder for stable and semi-stable turning of austenitic and duplex stainless steels?"
The ZCC.CT CNMG120404-DM YBM251 is a high-performance turning insert engineered for versatility. The YBM251 grade combines a tough carbide substrate with an advanced multi-layer PVD coating, offering exceptional resistance to thermal shock and notch wear. Featuring the DM chipbreaker, it is specifically designed for medium-duty machining (Medium-Cut), providing excellent chip breaking even in "stringy" materials like 304 or 316 stainless steel, ensuring high process reliability and superior surface finishes.
Key Features
- Optimized YBM251 PVD Grade: Superior coating adhesion reduces built-up edge (BUE) and extends tool life in difficult-to-machine materials.
- DM Chipbreaker Geometry: The "Medium" range geometry provides a perfect balance between edge strength and sharpness for versatile applications.
- Extreme Thermal Resistance: Engineered to handle the high heat generated during stainless steel machining.
- Double-Sided Design: 80° Diamond shape with 4 usable cutting edges for maximum cost-efficiency.
Technical Specifications
ISO Model Breakdown (CNMG 120404-DM)
80° Diamond
0° Clearance
Tolerance
Hole/Chipbreak
12.9mm Edge
4.76mm Thick
0.4mm Radius
Medium Cut
| Metric Model | ANSI/Imperial Model |
|---|---|
| CNMG120404-DM | CNMG 431-DM |
Recommended Cutting Data
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Stainless Steel (M) | 150 - 260 m/min | 0.15 - 0.50 mm/rev |
| Superalloys (S) | 30 - 80 m/min | 0.12 - 0.40 mm/rev |
Tool Compatibility
Matching External/Internal Turning Tool Holders:
Fits all standard D-clamping and P-clamping systems using CNMG 1204 series.
Common Applications
The first choice for Medium-Roughing to Semi-Finishing operations in:
ZCC.CT Grade Quick Guide (Stainless)
| Grade | Best Use Case | Hardness/Toughness |
|---|---|---|
| YBM151 | High Speed / Continuous Finishing | Highest Hardness |
| YBM251 | General Purpose / Medium Machining | Balanced |
What Our Customers Say
"Reliable Chip Control"
"We mill a lot of 316 stainless. The DM chipbreaker is a lifesaver. No more long stringy chips tangling the spindle."
— Markus B., Germany
"Better than Major Brands"
"Honestly, YBM251 performs just as well as the more expensive Swedish brands on our lathe. Tool life is very predictable."
— John D., USA
"Versatile Performance"
"Great for batch production. Consistent finish across 200 parts. Delivery to Italy was fast."
— Matteo V., Italy
"Tough Insert"
"Handles interrupted cuts on stainless casting surprisingly well for a PVD grade. No chipping found."
— Kenji T., Japan
Frequently Asked Questions
Q: Is YBM251 suitable for dry machining stainless steel?
A: While the PVD coating can handle heat, we strongly recommend using flood coolant to prevent chip adhesion and to maximize tool life in stainless steel turning.
Q: What is the difference between DM and DF chipbreakers?
A: DM is for Medium cutting (balanced), while DF is optimized for Finishing with lower cutting depths and higher precision.
Q: Can I use this insert on alloy steel?
A: Yes, YBM251 performs exceptionally well on various alloy steels, but it is primarily optimized for the specific challenges of the Stainless (M) material group.
Need Help With ZCC.CT Inserts?
Looking for a ZCC.CT equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
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.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.