ZCC.CT ZQMX4N11-1E YBC251 Carbide Cut-Off & Grooving Insert | ZQMX4N11-1E (Width: 4mm / 0.157")
✓ Free Worldwide Shipping
✓ 100% Guaranteed Compatibility | Direct Factory Direct
✓ Fast Dispatch within 24–48 Hours
✓ Technical Support: Need grade selection help? [Contact Engineer]
1. Product Overview
Which 4mm grooving and parting-off insert provides the most reliable tool life, chatter resistance, and clean chip evacuation during steel bar cut-off operations?
The ZCC.CT ZQMX4N11-1E YBC251 (Country of Origin: China) is a high-performance 4.0 mm (0.157") single-ended cut-off and grooving insert designed for heavy-duty metal parting, deep grooving, and turn-grooving applications. Manufactured by ZCC.CT (Zhuzhou Cemented Carbide Cutting Tools), this insert utilizes the renowned YBC251 CVD Coating Grade—a combination of thick TiCN and fine-grained Al2O3 layers over an ultra-tough carbide matrix engineered specifically for steel machining across ISO P10–P30 applications.
Featuring the specialized 1E Single-Edge Chipbreaker Geometry, the ZQMX4N11-1E forces chips to curl narrower than the groove width, avoiding side-wall scratching and preventing tool jam-ups during deep plunging. Its self-clamping wedge fit ensures exceptional seating rigidity in standard SPB cut-off blades and SMBB block holders on CNC turning centers.
Model Code Breakdown
2. Key Features
- YBC251 Dual-Layer CVD Coating: Ultra-thick TiCN layer prevents abrasive flank wear while the nano-Al2O3 barrier resists thermal cracking and cratering.
- 1E Chip Curling Geometry: Engineered rake angle compresses chips inward to fold narrower than the 4 mm groove, completely eliminating sidewall friction and binding.
- High Toughness Carbide Substrate: Absorbs mechanical shock during interrupted cuts, forged bar stock parting, and heavy plunging operations.
- 0° Neutral Cut Edge: Delivers flat groove bottoms without dish distortion or axial deflection.
- Secure Wedge Self-Clamping: Self-locking wedge seating eliminates clamp screws, enabling fast indexing on CNC turret stations.
3. Specifications & Dual-Unit Comparison
| Specification Parameter | Metric Unit (Standard) | Imperial Unit (Equivalent) |
|---|---|---|
| Insert Model Code | ZQMX4N11-1E YBC251 | ZQMX4N11-1E YBC251 |
| Cutting Width (W) | 4.0 mm | 0.157" (5/32" nominal) |
| Corner Radius (RE) | 0.3 mm | 0.012" |
| Max Parting Diameter | 50.0 mm bar stock | 1.968" bar stock |
| Coating Structure | CVD (TiCN + Al2O3) | CVD (TiCN + Al2O3) |
| Manufacturer / Origin | ZCC.CT / China | ZCC.CT / China |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Parting Feed Rate (f) | Grooving Feed Rate (f) |
|---|---|---|---|
| Carbon Steel (1045, 1018, A36) | 120 - 220 m/min (390 - 720 SFM) |
0.08 - 0.18 mm/rev (0.003 - 0.007 ipr) |
0.10 - 0.22 mm/rev (0.004 - 0.009 ipr) |
| Alloy Steel (4140, 4340, 8620) | 100 - 180 m/min (330 - 590 SFM) |
0.06 - 0.15 mm/rev (0.002 - 0.006 ipr) |
0.08 - 0.18 mm/rev (0.003 - 0.007 ipr) |
| Cast Steel / Mold Steel (P20, H13) | 90 - 160 m/min (295 - 525 SFM) |
0.05 - 0.12 mm/rev (0.002 - 0.005 ipr) |
0.06 - 0.15 mm/rev (0.002 - 0.006 ipr) |
Recommended Compatible Cut-Off Blades & Block Holders:
Fits all standard 4mm parting blades: SPB26-4, SPB32-4, mounted in SMBB2026 / SMBB2532 block toolholders.
Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Grade Examples | Performance Rating |
|---|---|---|---|
| P (Steel) | Primary Choice | 1045 Carbon Steel, 4140 Alloy Steel, 8620 Steel | ★★★★★ (Optimal) |
| K (Cast Iron) | Secondary Choice | Ductile Iron, Gray Cast Iron | ★★★☆☆ (Good) |
| M (Stainless Steel) | Conditional | 410, 420 Martensitic Stainless (Light cut-off) | ★★☆☆☆ (Limited) |
| N (Non-Ferrous) | Not Recommended | Aluminum, Brass, Copper | ★☆☆☆☆ (Not Recommended) |
4. Applications
- Solid Steel Bar Cut-Off: Parting off medium-to-large carbon steel and alloy bar stock up to 50mm diameter.
- Deep External Grooving: Cutting wide 4 mm external retaining ring grooves and sealing channels on turned shafts.
- Interrupted Parting Cuts: Parting forged tube stock or hex-bar material with keyways and surface irregularities.
5. Compatibility
Fits all standard SPB-4 (SPB26-4, SPB32-4) parting blades and compatible grooving systems across CNC turning centers from Haas, Mazak, Doosan/DN Solutions, Hyundai WIA, and Okuma.
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent Insert Designation |
|---|---|---|
| ZCC.CT (Original) | YBC251 (CVD) / YBC252 | ZQMX4N11-1E |
| Iscar | IC354 / IC908 | GTN-4 / GTMN-4 |
| Sandvik Coromant | GC4325 / GC1125 | N123H2-0400-0004-TF |
| Taegutec | TT9080 / TT7220 | TDT 4E / TDJ 4 |
| Korloy | NC3120 / PC9030 | SP400 / MGMN400-M |
7. Why Choose Us
We supply 100% factory-original ZCC.CT cutting tools imported straight from Zhuzhou. Every insert lot undergoes strict dimensional and coating inspections to ensure consistent wedge locking, edge sharpness, and high-productivity cut-off output.
Verified Customer Reviews
YBC251 grade on ZQMX4 is a workhorse for 4140 steel bar stock. We ran 400 cut-offs per insert edge without a single chipped tip.
Hervorragende Abstchneideplatte für SPB26-4 Schwerter. Der Spanbrecher 1E bricht die Späne sehr gut und verhindert Verklemmungen.
Ottimo rapporto qualità-prezzo. Gli inserti ZQMX4N11 YBC251 durano quanto i marchi europei più blasonati nella troncatura di acciaio 1045.
ZCC.CTのYBC251は耐摩耗性と靭性のバランスが素晴らしい。4mm幅の溝入れ加工が非常に安定して行えます。
Very reliable 4mm grooving insert for our Haas ST-30. Good chip curl and clean surface finish at 150 m/min.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Insert Edge Chipping at Center | Tool center height is set below spindle center line or feed rate is too high at bar center | Adjust tool height exact to center line (+0.05 mm max) and drop feed by 50% near zero radius. |
| Chip Jamming / Rough Side Wall | Feed rate f is too low to fully engage the 1E chipbreaker fold | Increase parting feed rate f slightly to activate active chip curling and prevent chip nesting. |
| Rapid Flank Wear / Heat Buildup | Cutting speed Vc is too high or coolant isn't hitting the groove pocket | Lower cutting speed Vc by 15% and direct high-pressure coolant straight into the cut slot. |
Under ISO 513:2012 standards, ZCC.CT YBC251 grade is classified under the ISO P15–P30 application range, providing the primary industry standard for general steel turning, parting, and grooving operations.
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.