Kyocera 1/2 ENDMILL 5FL CBTM SGS37521 | End Mill - Hardened Steel | Ky
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- Stock: In Stock
- Model: ENDMILL
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: SGS37521
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1. Product Overview
The Kyocera 1/2 ENDMILL 5FL 0.010R CBTM SGS37521 is a premium solid carbide end mill engineered for high-performance CNC milling operations. Manufactured in Japan to exacting tolerances, this 5fl tool features ultra-fine grain carbide (0.5 μm) and a AlCrN PVD coating for exceptional wear resistance and thermal stability.
Designed for hardened steel applications, this end mill delivers mirror-finish surface quality, extended tool life, and consistent dimensional accuracy across high-volume production runs. The 40° helix angle optimizes chip evacuation while minimizing cutting forces and vibration.
2. ISO Designation Breakdown
| Designation Element | Value | Description |
|---|---|---|
| Full ISO Code | D7.9375×L16.26×5F-R0.254-CBTM | Complete product identifier |
| D (Cutting Diameter) | 7.9375 mm (0.3125") | Nominal cutting diameter per ISO 13399 |
| L (Length of Cut) | 16.26 mm (0.64") | Axial cutting edge length |
| F (Number of Flutes) | 5 | Total cutting edges / flutes |
| R (Corner Radius) | 0.254 mm (0.010") | Edge corner radius for improved strength |
| Grade Code | CBTM | Coating and substrate specification |
| MPN | SGS37521 | Manufacturer Part Number |
3. Engineering Dimensions & Geometry
| Parameter | Metric (mm) | Imperial (inch) | Tolerance |
|---|---|---|---|
| Cutting Diameter (D1) | 7.9375 | 0.3125 | h6 |
| Length of Cut (L2) | 16.26 | 0.64 | +0.00 / -0.10 |
| Overall Length (L1) | 63.5 | 2.5 | ±0.25 |
| Shank Diameter (D2) | 7.9375 | 0.3125 | h6 |
| Core Diameter | 4.921 | 0.1938 | ±0.02 |
| Corner Radius | 0.254 | 0.010 | ±0.005 |
| Helix Angle | 40° | ±1° | |
| Number of Flutes | 5 | — | |
| Radial Runout | ≤ 0.005 mm | — | |
| Center Cutting | Yes | — | |
4. Grade Details — Key Grade Characteristics
Grade CBTM — AlCrN / TiAlN-Max on Ultra-Fine Grain Carbide Substrate
| Property | Value | Significance |
|---|---|---|
| Coating Type | AlCrN + TiAlN-Max | PVD multi-layer coating system |
| Coating Color | Blue-Grey | Visual grade identification |
| Coating Hardness | 93.5 HRA | Exceptional abrasion resistance |
| Transverse Rupture Strength | 4,200 MPa | High mechanical shock resistance |
| Max Operating Temperature | Up to 1,100°C | Suitable for dry/high-speed machining |
| Friction Coefficient | 0.30 | Reduced built-up edge, lower heat |
| Substrate Grain Size | 0.5 μm | Ultra-fine grain for superior edge sharpness |
| Surface Finish | Mirror polished flutes, 0.2 μm Ra | Minimizes friction and chip adhesion |
5. Grade Comparison Matrix
| Grade | Coating | Best For | Max Temp | Hardness |
|---|---|---|---|---|
| TA | TiAlN | General steel, high-speed dry machining | 900°C | 92.5 HRA |
| TM | TiAlN-Max | Stainless steel, titanium, Inconel | 950°C | 93.0 HRA |
| CB | AlCrN | Hardened steels, abrasive materials | 1,100°C | 93.5 HRA |
6. Flute Geometry & Chip Evacuation Design
The 5fl flute configuration of the SGS37521 is optimized for efficient chip evacuation and stable cutting dynamics. Each flute features a precisely ground 40° helix angle that progressively engages the workpiece, distributing cutting forces evenly across all five edges.
| Geometric Feature | Specification | Functional Benefit |
|---|---|---|
| Helix Angle | 40° | Smooth entry, reduced vibration, superior surface finish |
| Flute Profile | Parabolic core design | Enhanced chip curl and evacuation at high feed rates |
| Core Diameter Ratio | 62.0% of D1 | Optimal balance between rigidity and chip space |
| Rake Angle | 8° positive | Reduced cutting forces, lower heat generation |
| Clearance Angle | 12° primary / 18° secondary | Prevents rubbing, minimizes flank wear |
| Corner Radius | 0.254 mm | Strengthened corner, improved tool life in profiling |
7. Recommended Applications & Workpiece Materials
The CBTM grade 1/2 end mill is specifically engineered for the following material groups and industrial applications:
| Material Group | Specific Materials | Hardness Range | Machinability Rating |
|---|---|---|---|
| Primary | Hardened steels (45-65 HRC), tool steels, abrasive alloys | Varies by material | ★★★★★ |
| Secondary | Stainless steels, cast iron, titanium alloys | Varies by material | ★★★★☆ |
Key Industry Sectors: die & mold, aerospace, medical device manufacturing
8. Application Map by Operation
| Operation Type | Suitability | Recommended ae / ap | Expected Surface Finish |
|---|---|---|---|
| Slotting (Full Width) | ✓ Excellent | ae = 1.0D, ap ≤ 1.0×L2 | Ra 0.8 – 1.6 μm |
| Side Milling / Profiling | ✓✓ Outstanding | ae = 0.1D – 0.5D | Ra 0.4 – 0.8 μm |
| Pocketing / Roughing | ✓✓ Outstanding | ae = 0.3D – 0.7D, ap = 1.0×D | Ra 1.6 – 3.2 μm |
| Finishing | ✓✓ Outstanding | ae = 0.05D – 0.15D, ap = 0.2×D | Ra 0.2 – 0.4 μm |
| Plunge Milling | ✓ Good (center-cutting) | ap ≤ 0.5×D per plunge | Ra 0.8 – 1.6 μm |
| High-Feed Milling | ✓✓ Outstanding | ae = 0.05D – 0.1D, fz = 0.08 – 0.15 | Ra 1.6 – 3.2 μm |
9. Recommended Cutting Conditions
Parameters are starting recommendations. Adjust based on machine rigidity, workpiece fixturing, and coolant application. Values shown for primary application material.
| Parameter | Symbol | Recommended Range | Unit |
|---|---|---|---|
| Cutting Speed | Vc | 60 - 120 | m/min |
| Feed per Tooth | fz | 0.03 - 0.08 | mm/tooth |
| Axial Depth of Cut | ap | 0.5 - 2.0 | × D1 |
| Radial Depth of Cut | ae | 0.1D - 0.3D | × D1 |
| Spindle Speed (at Vc=100) | n | ~4,010 | RPM |
| Table Feed (at n=4010, fz=0.06) | Vf | ~1,203 | mm/min |
| Coolant Recommendation | — | External flood or through-spindle (MQL acceptable for dry-capable grades) | — |
10. Operating Guidelines
- Tool Runout: Ensure total indicator runout (TIR) at the tool tip does not exceed 0.01 mm. Excessive runout causes uneven flute loading and premature failure.
- Ramp Entry: When entering the workpiece, use a helical ramp angle of 1°–2° or less. Avoid plunging directly unless center-cutting capability is confirmed.
- Chip Evacuation: Maintain adequate coolant flow or compressed air to clear chips from the cutting zone. Recutting chips is the leading cause of edge chipping.
- Depth-of-Cut Strategy: For deep cavities, reduce axial depth (ap) to 0.5×D and increase radial engagement (ae) to improve chip thinning and reduce heat.
- Tool Overhang: Minimize tool overhang (stick-out) to the shortest practical length. Every 1×D increase in overhang reduces effective rigidity by approximately 75%.
- Wear Monitoring: Inspect tool edges after every 30–60 minutes of cutting time. Look for uniform flank wear (VB max = 0.2 mm) as the primary wear indicator.
- Storage: Store end mills in original packaging or protective tubes. Avoid contact between cutting edges to prevent chipping or micro-fractures.
11. Toolholder Compatibility
| Toolholder Type | Compatible Shank Range | Recommended Application | Runout |
|---|---|---|---|
| ER16 Collet Chuck | 6 – 10 mm | General purpose milling, finishing | ≤ 0.010 mm |
| ER20 Collet Chuck | 6 – 13 mm | Heavy roughing, high-torque applications | ≤ 0.015 mm |
| Hydraulic Expansion Chuck | 6 – 20 mm | High-precision finishing, mirror surfaces | ≤ 0.003 mm |
| Shrink Fit Holder (Haimer / Schunk) | 6 – 25 mm | Maximum rigidity, high-speed machining | ≤ 0.003 mm |
| Milling Chuck (Power Chuck) | 6 – 32 mm | Heavy-duty roughing, interrupted cuts | ≤ 0.010 mm |
12. Packaging & Ordering Information
| Item | Details |
|---|---|
| Manufacturer Part Number (MPN) | SGS37521 |
| Brand | Kyocera Precision Tools (Japan) |
| Packaging Type | Individual plastic tube with foam insert + anti-corrosion VCI paper |
| Minimum Order Quantity | 1 piece |
| Bulk Packaging | 10 pcs per master carton (available on request) |
| Warranty | Full manufacturer warranty against material and manufacturing defects |
| Country of Origin | Japan |
| HS Code | 8207.70.60 (Interchangeable tools for milling machines) |
13. Catalog Meta Data
| Attribute | Value |
|---|---|
| Catalog Series | Kyocera SGS Solid Carbide End Mills — General Purpose & High-Performance |
| Product Family | 5-Flute Square / Corner Radius End Mills |
| Tool Category | Solid Carbide End Mill (SCEM) |
| ISO 13399 Classification | Milling Tool — End Mill — Solid — 5 Flutes |
| DIN Standard | DIN 844 — Solid carbide end mills with cylindrical shank |
| ANSI Standard | ANSI B94.19 — Milling Cutters and End Mills |
| ECCN | 1C990 (General purpose cutting tools) |
| RoHS Compliance | Yes — Fully compliant with EU Directive 2011/65/EU |
| REACH Compliance | Yes — No SVHC substances above 0.1% w/w |
| Last Catalog Update | 2026-Q2 |
Why Buy from Kyotow.com? Every Kyocera tool listed is 100% genuine OEM, sourced directly from authorized distribution channels. We provide full manufacturer warranty coverage, expert CNC tooling application support, and dedicated technical assistance for bulk and institutional orders. Shop with confidence — precision starts with genuine tools.
✓ Genuine Kyocera Product
| Manufacturer | Kyocera Corporation |
|---|---|
| Status | Verified Original Product |
| Quality Assurance | Guaranteed Genuine Kyocera Components |
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Following the Japanese philosophy of Monozukuri (物の作り), we strive to maintain exceptional technical accuracy throughout our product catalog.
- Confirm dimensions, geometry, coating, and grade using the official Kyocera item code.
- Technical datasheets are available upon request.
- For technical clarification contact sales.kyotow@gmail.com.
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Technical Assistance:
Please verify machine compatibility, insert geometry, coating, and application grade before placing your order.
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Why are our prices so low? (価格が安い理由): Kyotow sources genuine Kyocera tools directly from domestic Japanese distribution networks, completely bypassing the steep regional markups, localized sales overhead, and heavy middleman margins of Western distributors. We pass 100% of those structural savings directly to your machine shop.
Kyotowは日本の国内流通ネットワークから京セラ正規品を直接仕入れることで、欧米の現地代理店による大幅な上乗せ価格や営業コスト、中間マージンを完全に排除しています。その構造的メリットを、お客様の加工現場へ100%還元いたします。
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