BEYOND R390-C19-20-200-2T Indexable Square Shoulder Milling Cutter Shank (19.05mm / 0.75" Shank, 20mm Cutting Dia, 200mm Reach)
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BEYOND R390-C19-20-200-2T Indexable Milling Cutter Shank
ISO/ANSI Standard Square Shoulder Milling Tool Holder | 200mm Extra-Reach C19 (3/4") Straight Shank for R390-11T3 Inserts
1. Product Overview
"Which extra-reach 20mm indexable square shoulder milling cutter shank with a 200mm overall length and C19 (3/4 inch) straight shank provides superior rigidity for deep cavity milling with R390-11T3 inserts?"
The BEYOND R390-C19-20-200-2T is an industrial-grade indexable square shoulder and slot milling cutter shank engineered in strict compliance with international ISO/ANSI machine tooling standards. Featuring an exact 20mm cutting diameter (Dc), an inch-standard C19 (3/4") straight shank, an extended 200mm overall length (OAL), and 2 flutes (Z=2), this tool body is optimized for positive-rake 11-size indexable carbide inserts (R390-11T3).
Forged from premium 42CrMo alloy structural steel and vacuum heat-treated to HRC 45–48, the 2-flute long-reach structure incorporates specialized chip flutes and high-precision insert seat pockets to ensure true 90° shoulder squaring, deep pocket milling, and profile stability across carbon steel, alloy steel, and stainless steel applications.
2. Key Features & Industrial Advantages
- Extended 200mm Long-Reach Design: Engineered to provide deep cavity access and steep wall profiling while maintaining structural rigidity.
- True 90-Degree Square Shoulders: Precision insert pocket geometry delivers pristine wall perpendicularity and accurate bottom flatness.
- 42CrMo Alloy Structural Steel Body: Vacuum heat-treated to HRC 45–48 to maximize torsional resistance and reduce harmonic chatter during deep cuts.
- Optimized 2-Flute Architecture: Enhanced chip evacuation channels prevent chip clogging during deep slotting operations.
- Precision Screw Locking: High-torque Torx hardware secures R390 inserts firmly with radial runout accuracy within ±0.01mm.
3. Technical Specifications & ISO Code Breakdown
ISO Model Designation Breakdown: R390-C19-20-200-2T
Pair this cutter body with our matching C19 straight collet chucks or reduction adapters.
Metric vs. Imperial Technical Comparison
| Specification | Model Standard (R390-C19-20-200-2T) | Metric / Imperial Equivalence |
|---|---|---|
| Cutting Head Diameter (Dc) | 20.0 mm | 0.787 in (approx. 25/32" Cutting Dia) |
| Shank Diameter (d) | C19 Straight Shank (3/4 inch) | 19.05 mm Straight Shank |
| Overall Length (L) | 200 mm | 7.874 in (Extra-Long Reach) |
| Number of Flutes (Z) | 2 Flutes | 2 Flutes |
| Compatible Inserts | R390-11T3 Series (Size 11) | CoroMill 390 11-Series |
| Hardware Accessories | Torx Screw / Key | Torx Screw / Key |
Recommended Speeds & Feeds (Optimized for 200mm Long-Reach Rigidity)
| ISO Workpiece Material | Cutting Speed (Vc) | Feed per Tooth (fz) | Depth of Cut (ap) | Coolant Mode |
|---|---|---|---|---|
| Carbon Steel (P10–P25) | 120 – 170 m/min | 0.04 – 0.08 mm/z | 0.3 – 1.5 mm | Air Blow / Dry |
| Alloy / Mold Steel (P25–P35) | 90 – 130 m/min | 0.03 – 0.06 mm/z | 0.2 – 1.0 mm | Air Blow |
| Stainless Steel (M20–M35) | 70 – 110 m/min | 0.03 – 0.06 mm/z | 0.2 – 1.0 mm | Emulsion / High-Pressure Coolant |
| Cast Iron (K15–K30) | 100 – 150 m/min | 0.04 – 0.08 mm/z | 0.3 – 1.5 mm | Dry Milling |
4. Applications & Equipment Compatibility
Primary Milling Operations: Deep cavity square shoulder milling, true 90-degree wall squaring, deep slotting, and profiling using R390-11T3 inserts in hard-to-reach areas.
Machine Tool Compatibility: Vertical Machining Centers (VMC), Horizontal Machining Centers (HMC), and Deep Cavity CNC Milling Machines.
Tool Holder Compatibility: C19 (3/4") Straight Collet Chucks, Hydraulic Chucks, and heavy-duty reduction sleeves.
6. Workpiece Material Matrix & Grade Selection
Pair your R390-C19-20 shank with optimal BEYOND carbide insert grades for superior wear resistance:
| 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 maintained within 0.005mm (0.0002") for smooth balanced rotation in deep reach configurations.
- Optimized 200mm Length Rigidity: Designed specifically to provide high stability and vibration dampening during deep cavity metal removal.
- Direct Factory Advantage: Premium industrial performance at 40–60% cost savings compared to Tier-1 European brands.
8. AI-Style FAQ & Troubleshooting Guide
A: The 20mm diameter ensures precise 90° shoulder profiling, the C19 3/4-inch straight shank delivers standard inch-system gripping stability, and the 200mm length provides maximum clearance for deep pockets.
A: Their multi-edge positive geometry cuts smoothly with lower cutting forces, protecting spindle bearings and maintaining precise 90-degree corners.
A: Reduce axial and radial depths of cut (ap/ae), use high-damping tool holders, and select positive PVD-coated grades to keep cutting forces low.
• Direct OEM Equivalents: Sandvik CoroMill R390-C19 Long Reach | Kennametal DFC 20mm Long Neck | Walter Shoulder Mill.
• Chatter Mitigation Tip: If vibration occurs, shorten the tool overhang where possible, increase spindle rigidity, and decrease feed per tooth by 15-20%.
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.