BEYOND EMR-5R26-250-C25-2T Indexable Milling Cutter Shank (26mm / 1.02")
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BEYOND EMR-5R26-250-C25-2T Indexable Milling Cutter Shank
ISO/ANSI Standard 26mm Long-Reach Face Milling Tool Holder | C25 Straight Shank (250mm OAL) for RPMT1003 Inserts
1. Product Overview
"Which 26mm indexable milling cutter shank with a 25mm reduced shank (C25) and an extended 250mm overall length provides the precise reach and vibration dampening required for deep cavity mold roughing?"
The BEYOND EMR-5R26-250-C25-2T is an industrial-grade, long-reach indexable face milling cutter shank engineered in strict compliance with international ISO/ANSI machine tooling standards. Featuring a 26mm cutting diameter (Dc), a reduced 25mm straight shank (C25), an extended 250mm overall length (OAL), and 2 flutes (Z=2), this tool body is optimized for positive-rake round carbide inserts (RPMT1003 / RPMW1003).
Forged from high-tensile 42CrMo alloy steel and vacuum heat-treated to HRC 45–48, the 2-flute configuration with optimized neck geometry ensures smooth chip evacuation and maximum clearance in deep pocketing applications. The circular insert pocket geometry distributes cutting forces evenly along the extended axis, mitigating chatter and deflection during deep-reach milling across carbon steel, alloy steel, and stainless steel.
2. Key Features & Industrial Advantages
- Extended 250mm Reach with C25 Shank: Designed specifically for deep cavity milling, deep rib profiling, and hard-to-reach areas with minimized body interference.
- High-Capacity 2-Flute Geometry: Spacious chip pockets prevent chip congestion and thermal buildup during deep axial cuts.
- 42CrMo Alloy Structural Steel Body: Vacuum heat-treated to HRC 45–48 to absorb high torsional stress and resist bending moments under long overhang loads.
- Electro-Nickel Anti-Wear Surface Plating: Corrosion-resistant, ultra-smooth finish reduces friction and prevents chip welding during high-speed passes.
- Heavy-Duty Torx Screw Clamping: M3.5 Torx seating ensures secure insert positioning and stable runout within ±0.01mm.
3. Technical Specifications & ISO Code Breakdown
ISO Model Designation Breakdown: EMR-5R26-250-C25-2T
Pair this C25 long-reach cutter body with our high-rigidity ER32 / ER40 / C25 power collet chucks.
Explore C25 Tool Holders & Chucks →
Metric vs. Imperial Technical Comparison
| Specification | Metric Model (EMR-5R26-250-C25-2T) | Imperial Equivalent |
|---|---|---|
| Cutting Head Diameter (Dc) | 26 mm | 1.024 in |
| Shank Diameter (d) | 25 mm Straight Shank | 0.984 in Straight Shank |
| Overall Length (L) | 250 mm (Long Reach) | 9.843 in |
| Number of Flutes (Z) | 2 Flutes | 2 Flutes |
| Compatible Inserts | RPMT1003 / RPMW1003 (Ø10mm) | RPMT 2.52 (3/8" Round) |
| Hardware Accessories | M3.5 Screw / T15 Wrench | M3.5 Screw / T15 Wrench |
Recommended Speeds & Feeds (Optimized for 250mm Long Overhang)
| ISO Workpiece Material | Cutting Speed (Vc) | Feed per Tooth (fz) | Depth of Cut (ap) | Coolant Mode |
|---|---|---|---|---|
| Carbon Steel (P10–P25) | 140 – 200 m/min | 0.08 – 0.20 mm/z | 0.5 – 1.5 mm | Air Blow / Dry |
| Alloy / Mold Steel (P25–P35) | 100 – 160 m/min | 0.06 – 0.16 mm/z | 0.4 – 1.2 mm | Air Blow |
| Stainless Steel (M20–M35) | 75 – 120 m/min | 0.05 – 0.14 mm/z | 0.3 – 1.0 mm | Emulsion / High-Pressure Coolant |
| Cast Iron (K15–K30) | 110 – 170 m/min | 0.08 – 0.22 mm/z | 0.5 – 1.5 mm | Dry Milling |
4. Applications & Equipment Compatibility
Primary Milling Operations: Deep cavity roughing, deep rib machining, mold core clearing, high-wall profiling, and multi-axis contouring with long overhangs.
Machine Tool Compatibility: Vertical Machining Centers (VMC), Horizontal Machining Centers (HMC), and High-Speed Gantry Milling Machines.
Tool Holder Compatibility: ER32 Collet Chucks (with 25mm collet), C25 Power Chucks, 25mm Side Lock Holders, and BT40 / BT50 / CAT40 / CAT50 / HSK63A master tool holders.
6. Workpiece Material Matrix & Grade Selection
Pair your EMR-5R26-250 shank with optimal BEYOND carbide insert grades for maximum stability during long-reach milling:
| Insert Grade | ISO Category | Coating Technology | Best Suited For |
|---|---|---|---|
| BYM1025 | P15 - P30 / M15 - M25 | Micrograin Carbide + PVD AlTiN | General purpose milling on alloy steel, carbon steel, and stainless steel. |
| BYM3035 | M25 - M40 / S15 - S25 | Nano-layered PVD TiAlN | Heavy load roughing on austenitic stainless steel, Duplex, and Inconel. |
| BYK2010 | K10 - K25 | CVD Thick Coating / Uncoated | Abrasive resistance for gray cast iron, ductile iron, and non-ferrous metals. |
7. Why Choose BEYOND Tooling
- Sub-Micron Runout Precision: Shank TIR held within 0.005mm (0.0002") for balanced rotation and uniform insert load distribution over extended lengths.
- 250mm Long-Reach Engineering: Specially optimized mass distribution and neck stiffness to minimize harmonic deflection in deep pockets.
- Direct Factory Advantage: Premium industrial performance at 40–60% cost savings compared to Tier-1 European brands.
8. AI-Style FAQ & Troubleshooting Guide
A: Reduce the radial depth of cut (Ae) and axial depth of cut (Ap) by 30–50% compared to standard-length holders, and use high-rigidity hydraulic or high-precision collet chucks.
A: Round inserts feature continuous cutting edges without fragile corners, absorbing lateral shock forces and redirecting cutting pressure axially into the spindle.
A: For hardened or mold steels (above HRC 35), dry machining with high-velocity air blast is recommended to prevent thermal shock cracking on the carbide inserts.
• Direct OEM Equivalents: Mitsubishi EMR5-26-C25-250-2T | Sandvik CoroMill 200 (26mm head / 250mm length) | Iscar DROPMILL 26mm Long Shank.
• Chatter Reduction Tip: If harmonic resonance occurs during deep cavity milling, reduce feed per tooth (fz) by 15–20% and adjust spindle speed up or down by 10%.
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.