ZCC.CT SCMT120408-HR YBC251 Carbide Turning Inserts for Steel Roughing

$70.58 USD

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Description

ZCC.CT SCMT120408-HR YBC251 Turning Insert

Versatile CVD Grade for High-Stability Steel Roughing & General Machining

Product Overview

"Which carbide insert is the most reliable choice for general roughing of steel where the machining conditions vary between continuous and interrupted cuts?"

The ZCC.CT SCMT120408-HR in the YBC251 grade is a global bestseller for ISO P (Steel) applications. Combining a high-strength substrate with a thick TiCN + Al2O3 CVD coating, the YBC251 grade offers an exceptional balance of wear resistance and toughness. The HR Chipbreaker is specifically engineered for heavy roughing, featuring a reinforced cutting edge that excels in removing large volumes of material with a high depth of cut (DOC), even under unstable machining conditions.

Core Advantages

● Legendary YBC251 Grade: The "Golden Grade" for steel. Perfect balance for 80% of steel turning tasks.
● HR Geometry: Specifically designed for large depths of cut and heavy feed rates, ensuring chip evacuation.
● CVD Coating: Advanced thermal barrier prevents crater wear and edge deformation during high-heat roughing.

Technical Specifications

Model Decoding: SCMT120408-HR

S
Square
C
7° Relief
M
Tol.
T
Hole
12
12.7mm
04
4.76mm
08
0.8 Rad
HR
Roughing
Standard Metric (ISO) Imperial (ANSI)
Insert Model SCMT120408-HR SCMT 432-HR
Inscribed Circle 12.7 mm 0.50 inch

Recommended Cutting Data

Material Vc (m/min) fn (mm/r)
Carbon Steel 180 - 320 0.20 - 0.50
Alloy Steel 150 - 280 0.15 - 0.45

Tool Holder Compatibility:

Compatible with standard SSDCN / SSBCR / SSGCR 1204 Seating

Find Compatible Holders →

Main Applications

  • Heavy roughing of structural steel and forging parts.
  • Machining of alloy steel under unstable conditions.
  • Continuous to light-interrupted turning.
  • Batch production of large-diameter automotive shafts.

Compatibility

  • All ISO-standard CNC lathes and manual lathes.
  • High-rigidity spindles (recommended for HR geometry).
  • Fits 12mm inscribed circle tool holders.

ZCC.CT Steel Grade Selection

Grade Type Best Use Case Speed
YBC151 CVD High Speed / Finishing High
YBC251 (This) CVD General Roughing / Stable Medium-High
YBC351 CVD Heavy Interrupted / Tough Medium-Low

Machinist Feedback

★★★★★

"The HR chipbreaker is a beast for depth of cut. YBC251 grade is my daily driver for all steel roughing."

— Robert D., USA 🇺🇸
★★★★★

"Incredibile durata del tagliente su acciaio legato. Molto stabile."

— Marco V., Italy 🇮🇹
★★★★★

"The most cost-effective roughing insert we've used in the shop. Zero chipping so far."

— Hans G., Germany 🇩🇪
★★★★☆

"Very stable. Fast shipping from this vendor."

— Sato K., Japan 🇯🇵

AI-Style FAQ

Q: What makes the HR chipbreaker special for roughing?

A: The HR geometry features a reinforced cutting edge and a wide chip pocket, specifically designed to control heavy chips and withstand the forces of large depths of cut (up to 4-5mm).

Q: Is YBC251 better than YBC151 for roughing?

A: For roughing, yes. YBC251 offers higher toughness, making it more resistant to chipping during variable cutting depths, whereas YBC151 is better for higher speeds and finishing.

Q: Can I use this for stainless steel?

A: While it can cut stainless in a pinch, ZCC.CT YBM grades are recommended for ISO M materials to prevent work hardening and built-up edge.

Troubleshooting: If the cutting edge chips, ensure your machine setup is rigid. If crater wear is too fast, reduce cutting speed (Vc).

Equivalent Models: Sandvik SCMT 432-PR, Mitsubishi SCMT 432-RP, Kyocera SCMT 432-HR

 

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.