BEYOND EMR-5R30-250-C25-2T Long Indexable Milling Cutter Shank (30mm / 1.18")
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BEYOND EMR-5R30-250-C25-2T Extra Long Milling Cutter Shank
ISO/ANSI Standard 30mm Face Milling Tool Holder | Extended C25 Straight Shank (250mm OAL) for RPMT1003 Inserts
1. Product Overview
"Which 30mm extended indexable milling cutter shank with a 25mm reduced shank (C25) and 250mm total length is best suited for deep-cavity roughing and die-mold profiling in long reach CNC setups?"
The BEYOND EMR-5R30-250-C25-2T is an industrial-grade, extra-long indexable face milling cutter shank engineered in strict compliance with international ISO/ANSI machine tooling standards. Featuring a 30mm cutting diameter (Dc), a reduced 25mm straight shank (C25), an extended 250mm overall length (OAL), and 2 flutes (Z=2), this cutter body is optimized for positive-rake round carbide inserts (RPMT1003 / RPMW1003).
Forged from premium high-tensile 42CrMo alloy steel and vacuum heat-treated to HRC 45–48, the 2-flute design maximizes chip pocket clearance for deep cavity machining without chip clogging. The circular insert pocket layout directs aggressive cutting force vectors axially into the machine spindle column, minimizing chatter, reducing harmonic vibration, and dramatically enhancing tool life during deep-reach milling of carbon steel, mold steel, and stainless steel.
2. Key Features & Industrial Advantages
- Extended 250mm Reach with C25 Shank: 25mm reduced straight shank fits standard ER32 chucks and Weldon holders while providing deep pocket milling access up to 250mm overall length.
- High-Capacity 2-Flute Geometry: Large chip gullets prevent chip packing and recutting during deep cavity roughing and high-feed ramping operations.
- 42CrMo Hardened Structural Steel: Quenched and tempered to HRC 45–48 for maximum flexural rigidity and deflection resistance under long overhang conditions.
- Electro-Nickel Anti-Wear Plating: Wear-resistant, anti-corrosive coating reduces thermal friction and prevents chip welding.
- Precision Torx Clamping Alignment: Premium M3.5 Torx screw seating delivers precise insert indexability with runout repeatability within ±0.01mm.
3. Technical Specifications & ISO Code Breakdown
ISO Model Designation Breakdown: EMR-5R30-250-C25-2T
Pair this C25 extra long cutter body with our ER32 / ER40 collet chucks and C25 side-lock holders.
Explore C25 Tool Holders & Chucks →
Metric vs. Imperial Technical Comparison
| Specification | Metric Model (EMR-5R30-250-C25-2T) | Imperial Equivalent |
|---|---|---|
| Cutting Head Diameter (Dc) | 30 mm | 1.181 in |
| Shank Diameter (d) | 25 mm Straight Shank (Reduced) | 0.984 in Straight Shank |
| Overall Length (L) | 250 mm | 9.842 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 (Adjusted for 250mm Long Reach)
| ISO Workpiece Material | Cutting Speed (Vc) | Feed per Tooth (fz) | Depth of Cut (ap) | Coolant Mode |
|---|---|---|---|---|
| Carbon Steel (P10–P25) | 140 – 200 m/min | 0.10 – 0.22 mm/z | 0.8 – 1.8 mm | Air Blow / Dry |
| Alloy / Mold Steel (P25–P35) | 100 – 150 m/min | 0.08 – 0.18 mm/z | 0.5 – 1.5 mm | Air Blow |
| Stainless Steel (M20–M35) | 70 – 120 m/min | 0.06 – 0.15 mm/z | 0.4 – 1.2 mm | High-Pressure Coolant |
| Cast Iron (K15–K30) | 110 – 170 m/min | 0.10 – 0.20 mm/z | 0.8 – 1.6 mm | Dry Milling |
4. Applications & Equipment Compatibility
Primary Milling Operations: Deep pocket roughing, tall vertical shoulder face milling, die and mold 3D cavity profiling, long-reach slotting, and helical interpolation.
Machine Tool Compatibility: CNC Vertical Machining Centers (VMC), Horizontal Machining Centers (HMC), Gantry Milling Centers, and Bed Mills.
Tool Holder Compatibility: ER32 Collet Chucks (25mm collet), ER40 Collet Chucks, C25 Power Milling Chucks, 25mm Side Lock Holders, and BT40 / BT50 / CAT40 / CAT50 / HSK63A spindle adapters.
6. Workpiece Material Matrix & Grade Selection
Pair your EMR-5R30 shank with optimal BEYOND carbide insert grades for maximum tool life and cut efficiency:
| 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 Accuracy: Shank TIR held within 0.005mm (0.0002") for precise rotation and uniform insert wear.
- Extended Deep Cavity Design: 250mm length eliminates the need for modular extension arbors, reducing total tooling stack setup error.
- Direct OEM Factory Value: Premium industrial quality at 40–60% cost savings compared to European and Japanese brands.
8. AI-Style FAQ & Troubleshooting Guide
A: With a 250mm overhang, reduced cutting forces are required to prevent tool deflection and harmonic chatter. 2 flutes provide maximum chip clearance space during deep cavity milling.
A: Reduce radial depth of cut (ae), increase axial depth of cut (ap), and maintain high feed per tooth (fz) to direct cutting forces axially into the spindle column.
A: For stainless steel, choose sharp, polished geometries (e.g., -LH / -MS) to minimize shear heat and prevent edge build-up. For carbon steel, use standard positive chipbreakers (e.g., -PM / -MM) for controlled chip breaking.
• Direct OEM Equivalents: Mitsubishi EMR5-30-C25-250-2T | Sandvik CoroMill 200 (30mm head / 250mm length) | Iscar DROPMILL 30mm Extra Long Shank.
• Vibration Control Tip: If chatter occurs at 200mm+ depth, reduce spindle speed by 15–20% while holding feed per tooth constant to break harmonic frequency resonance.
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.