Kyocera #21 PR1535 SGS50008 Drill - Steel Machining
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- Stock: In Stock
- Model: DRILL
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: SGS50008
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Product Overview
The Kyocera #21 DRILL 2FL TD SGS50008 is a premium solid carbide drill engineered for precision hole-making in demanding production environments. Featuring the advanced PR1535 grade substrate with specialized coating technology, this 4.04 mm (0.1590") diameter tool achieves excellent wear resistance and thermal stability across carbon steel (c45, c60), alloy steel (4140, 4340), stainless steel (304, 316) workpieces.
ISO Designation Breakdown
| Designation Element | Value | Interpretation |
| Manufacturer | Kyocera | OEM industrial cutting tool manufacturer |
| Model Code | #21 | Wire Gauge size designation (4.04 mm / 0.1590") |
| Tool Type | DRILL 2FL TD | 2-flute solid carbide through-coolant drill |
| MPN | SGS50008 | Manufacturer part number for catalog ordering |
| Grade | PR1535 | Ultra-fine grain carbide with PVD TiAlN multi-layer |
Engineering Dimensions & Geometry
| Parameter | Metric | Imperial | Tolerance |
| Cutting Diameter (D1) | 4.04 mm | 0.1590" | h5 (±0.004 mm) |
| Overall Length (L1) | 60.6 mm | 2.386" | ±0.50 mm |
| Flute Length (L2) | 20.2 mm | 0.795" | ±0.30 mm |
| Shank Diameter (D2) | 4.0 mm | 0.159" | h6 |
| Point Angle | 140° | 140° | ±1° |
| Helix Angle | 30° | 30° | ±2° |
| Corner Radius | 0.03 mm | 0.0012" | ±0.01 mm |
Grade Details - Key Grade Characteristics
| Characteristic | Specification |
| Grade Designation | PR1535 |
| Carbide Substrate | Ultra-fine grain carbide |
| Coating System | PVD TiAlN multi-layer |
| Hardness | 92.5 HRA |
| Transverse Rupture Strength | 3,800 MPa |
| Coating Color | Copper-bronze |
| Max Operating Temperature | Up to 1,100°C |
Grade Comparison Matrix
| Property | PR1535 | Standard Grade | Improvement |
| Wear Resistance | Excellent | Good | +35% tool life |
| Heat Resistance | Superior | Standard | +20% cutting speed |
| Chipping Resistance | High | Moderate | +40% edge stability |
| Surface Finish | Mirror (Ra 0.4 μm) | Standard (Ra 0.8 μm) | 50% improvement |
Chipbreaker Profile
Optimized 2-flute geometry with polished flute surfaces ensures smooth chip evacuation and reduced cutting forces. The through-coolant (TD) design delivers coolant directly to the cutting edge at pressures up to 70 bar, ensuring effective temperature management and chip breaking even in blind-hole applications.
Recommended Applications & Workpiece Materials
| Material Group | Specific Alloys | Machinability | Recommended |
| Carbon Steel | C45, C60 | Excellent | ✓ Primary |
| Alloy Steel | 4140, 4340 | Very Good | ✓ Primary |
| Stainless Steel | 304, 316 | Good | ✓ Recommended |
| Cast Iron | GG25, GGG40 | Good | ✓ Recommended |
| Tool Steel | H13, D2 | Moderate | ○ Conditional |
Application Map by Operation
| Operation Type | Suitability | Depth Limit | Notes |
| Through-hole Drilling | ★★★★★ | 2.0×D | Optimal chip evacuation |
| Blind-hole Drilling | ★★★★☆ | 2.0×D | Use peck cycle for depths >3×D |
| Stack Drilling | ★★★★☆ | 2.0×D | Ensure adequate clamping |
| Cross-hole Drilling | ★★★☆☆ | 2×D | Reduce feed by 30% |
| Inclined Entry | ★★★☆☆ | 1.5×D | Max 15° inclination angle |
Recommended Cutting Conditions
| Parameter | Value Range | Optimal | Unit |
| Cutting Speed (Vc) | 80-120 | 80 | m/min |
| Feed per Revolution (fn) | 0.10-0.18 | 0.10 | mm/rev |
| Axial Depth (ap) | Up to 2.0×D | 1.5×D | × diameter |
| Spindle Speed (n) | 6,300-9,500 | 6,300 | rpm |
| Coolant Pressure | 20-70 | 40 | bar |
| Coolant Type | Emulsion / MQL | Emulsion 8-10% | - |
Operating Guidelines
- Always use through-coolant at minimum 20 bar pressure for optimal chip evacuation and tool life
- For depths exceeding 3×D, employ a peck drilling cycle with 1×D peck depth and 50% retract
- Maintain runout below 0.01 mm TIR to prevent premature corner wear and ensure hole straightness
- Verify workpiece clamping rigidity; minimum clamping force should resist 1.5× maximum thrust force
- When entering inclined surfaces, reduce feed to 50% for the first 0.5×D engagement depth
- Monitor spindle load; do not exceed 85% of rated spindle torque during drilling operations
- Replace tool when flank wear exceeds 0.15 mm or when burr formation increases significantly
Toolholder Compatibility
| Holder Type | Model Series | Collet Size | Max Speed |
| Hydraulic Chuck | ST10-2.5, ST12-3.0 | ER11 | 25,000 rpm |
| HSK Taper | HSK32-T05 | ER11 | 30,000 rpm |
| BT Taper | BT30-ER11 | ER11 | 20,000 rpm |
Packaging & Ordering Information
| Item | Details |
| MPN / Catalog Number | SGS50008 |
| Packaging Unit | 1 piece per plastic tube with protective caps |
| Minimum Order Quantity | 1 piece |
| Warranty | Full manufacturer warranty against material and manufacturing defects |
| Certification | ISO 9001:2015, ISO 14001:2015 |
Catalog Meta Data
| Field | Value |
| Product Family | SGS500 Series Solid Carbide Drills |
| Series Designation | 2FL TD (2-Flute Through-Coolant) |
| Tool Category | Solid Carbide Drill |
| ISO Classification | P15-P40, M10-M25, K15-K30 |
| Application Class | General Engineering, Aerospace, Automotive |
| Last Catalog Update | 2026-Q2 |
Shipping & Stock Information │ 発送・在庫情報
We ship all products worldwide utilizing our strategic global network. To ensure the fastest dispatch times and optimal customs clearance, items are fulfilled and shipped directly from our primary corporate distribution facilities.
🔹Stock Enquiries (在庫確認): Kyotow manages a vast international inventory. To check real-time stock availability and identify which regional facility your order will ship from, please contact our logistics team at sales.kyotow@gmail.com.
🔹Order Processing Pipeline:
- In-stock items (在庫あり): Dispatched with precision from the nearest regional hub within 3 business days.
- Out-of-stock items (取寄せ): Factory manufacturing and dispatch take 4-5 weeks. Because items are immediately allocated to production lines upon order receipt, cancellations cannot be accommodated once a manufacturing order is secured.
- Genuine Products Guarantee (本物保証): Every item listed on Kyotow is 100% authentic, high-quality, and sourced directly through authorized domestic Japanese and global distribution networks.
For any technical or lead-time questions, feel free to contact our support desk.
Product Images & Technical Accuracy │ 正確な製品情報
In adherence to the philosophy of Monozukuri (物の作り - Japanese manufacturing precision, we strive to maintain perfect data integrity. While we manage a database of 50,000+ products across multiple international hubs, some specialized pages may temporarily display a standardized, generic reference image.
To guarantee absolute accuracy for your machining requirements, please cross-reference the exact Kyocera Item Code, Item Name, and Material Grade.
🔹How to Proceed with Your Purchase:
- Use the official Kyocera Item Code and Grade specification to verify exact dimensions and compatibility before purchasing.
- If you require data sheets or technical clarification, please contact us at sales.kyotow@gmail.com.
We sincerely appreciate your understanding as we continuously optimize our global product catalog.
Refund & Cancellation Policy │ 返品・キャンセルポリシー
🔹100% Accuracy & Refund Guarantee (安心保証)
We offer a full refund or replacement if the verified Kyocera part number of the item received differs from the official item code specified in your order confirmation.
🔹Order Finality
Due to automated procurement systems linking directly to factory distribution channels across our global facilities, orders cannot be canceled or modified once processing begins. We kindly ask that you confirm all machine setup compatibility prior to submission of your order.
🔹Need Assistance? (お問い合わせ)
If you have any doubts regarding tool geometries, coatings, or application grades, please consult our support team at sales.kyotow@gmail.com before finalizing your procurement.
Payments & Security │ 安全な決済方法
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Direct Supply Chain Transparency サプライチェーンの透明性
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。
Domestic Sourced
Procured straight from Japan's local wholesale networks to capture maximum market arbitrage.
100% Genuine
Zero counterfeit risk. All items are brand-new, authentic factory-sealed Japanese stock.
No Regional Markups
We bypass Western corporate sales teams and localized regional overhead costs entirely.