ZCC.CT SCMT120408-HM YBM251 square carbide insert for stainless steel CNC machining

ZCC.CT SCMT120408-HM YBM251 Carbide Turning Inserts for Stainless Steel

$82.56 USD

Price shown is a starting point. Contact us for a precise quote based on your requirements.

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Description

ZCC.CT SCMT120408-HM YBM251 Turning Insert

The Professional Solution for Stainless Steel Medium-Duty Machining

Product Overview

"Which carbide insert is best for machining 304 or 316 stainless steel with stable chip control and high wear resistance in medium-duty operations?"

The ZCC.CT SCMT120408-HM in the YBM251 grade is a premier choice for ISO M (Stainless Steel) and ISO P (Steel). The YBM251 grade utilizes a second-generation dual-coating technology (CVD TiCN + Al2O3), offering a unique combination of high toughness and crater wear resistance. The HM chipbreaker is engineered for medium machining, providing a balanced geometry that ensures excellent chip breaking and evacuation even in "gummy" materials like austenitic stainless steels.

Key Performance Advantages

● YBM251 Grade: Specifically optimized for stainless steel to reduce work hardening and built-up edge (BUE).
● HM Medium Geometry: Balanced cutting edge strength and chip control for versatile machining depths.
● CVD Coating Tech: High-temperature stability allows for increased cutting speeds without edge deformation.

Technical Specifications

Model Decoding: SCMT120408-HM

S
Square
C
7° Relief
M
Tolerance
T
Hole
12
12.7mm
04
4.76mm
08
0.8 Rad
HM
Medium
Dimension Unit Metric (ISO) Imperial (ANSI Equivalent)
Insert Code SCMT120408-HM SCMT 432-HM
I.C. Size 12.7 mm 0.50 inch

Recommended Cutting Data

Material Group Vc (m/min) fn (mm/r)
Stainless Steel (Austenitic) 150 - 260 0.15 - 0.40
Alloy Steel (< 300HB) 180 - 300 0.12 - 0.35

Compatible Holders:

Standard SSDCN / SSBCR / SSGCR 1204 Seating Holders

Browse SCMT12 Tool Holders →

Main Applications

  • Turning of Stainless Steel 304, 316, and 400 series.
  • Medium machining of low carbon and alloy steels.
  • Ideal for components with complex profiles and varying diameters.
  • Suitable for both continuous and slightly interrupted cuts.

Compatibility

  • Compatible with all ISO standard CNC turning centers.
  • Optimized for machines with high coolant pressure.
  • Industry standard 12.7mm (1/2") inscribed circle seating.

ZCC.CT Grade Guide for Stainless & Steel

Grade Coating Main Target Speed
YBM151 CVD Stainless Steel Finishing High
YBM251 (This) CVD General Stainless Machining Medium-High
YBC251 CVD General Steel Machining Medium

Verified Global Customer Reviews

★★★★★

"YBM251 is amazing on SS316. HM chipbreaker handles the chips perfectly at 0.25mm feed."

— David L., USA 🇺🇸
★★★★★

"Ottima resistenza all'usura su acciaio inossidabile. ZCC.CT non delude mai."

— Giuseppe F., Italy 🇮🇹
★★★★★

"Sehr gute Standzeit bei der Bearbeitung von V4A. HM-Spanleitstufe bricht sauber."

— Klaus R., Germany 🇩🇪
★★★★☆

"Fast shipping and original ZCC quality. Very stable in our CNC lathe."

— Kenji M., Japan 🇯🇵

AI-Style FAQ

Q: Is YBM251 better than YBC251 for stainless steel?

A: Yes. YBM251 is specifically engineered for ISO M (Stainless), featuring a substrate and coating designed to prevent sticking and work hardening, which are common issues with standard steel grades like YBC251.

Q: What depth of cut is recommended for the HM chipbreaker?

A: The HM geometry is designed for medium machining, typically excelling between 1.0mm and 4.0mm depth of cut (ap).

Q: Can I use this for dry machining?

A: While the CVD coating can handle high heat, using coolant is strongly recommended for stainless steel to improve chip evacuation and surface finish.

Grade Tip: If you face excessive built-up edge, try increasing the cutting speed (Vc) or checking the coolant flow concentration.

Equivalent Models: Sandvik SCMT 432-MM, Mitsubishi SCMT 432-MS, Kyocera SCMT 432-HM

Workpiece Matrix: Austenitic SS, Martensitic SS, Low Carbon Steel.

 

Technical FAQ & Buying Guide

Are your carbide inserts interchangeable with major brands like Sandvik, Iscar, or Kennametal?

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.

How do I choose the correct insert grade and chipbreaker for machining Stainless Steel (M) vs. Carbon Steel (P)?

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.
What are the recommended cutting speed (Vc) and feed rate (f) parameters to maximize tool life?

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.
Do you offer bulk discounts or wholesale pricing for machine shops and distributors?

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.

What is your international shipping policy and typical lead time for orders?

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.

How do you guarantee the quality and tolerance precision of your CNC tools?

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.