Kyocera 1/4 6FL PR1535 SGS74155 DRILL - CNC Drilling
For your absolute peace of mind, all transactions are processed through and secured by PayPal. Your purchase is fully covered by PayPal Buyer Protection, ensuring secure data encryption and trusted dispute resolution.
安心の決済保護：すべてのお手続きはPayPalを介して安全に暗号化され、バイヤープロテクション（購入者保護）が適用されます。
- Stock: In Stock
- Model: DRILL
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: SGS74155
Flat $50 USD Shipping worldwide via DHL Express. Maximize your savings by ordering in bulk packs!
International Shipping Note
Please note that any local customs duties, taxes, or import fees are not included in the checkout price and must be borne by the customer.
How it works: Once your package arrives at your country's customs office, DHL will contact you directly via email, SMS, or phone to guide you through the local clearance and payment process.
DHL secure global delivery. Tracked from our door to yours. Kyotow.com Secured
Product Overview
The Kyocera 1/4 DRILL 6FL SGS74155 is a premium solid carbide drill engineered for high-speed machining and fine finishing. Featuring grade PR1535 micro-grain carbide substrate with advanced PVD coating, this tool delivers exceptional hole quality, dimensional accuracy, and extended tool life across demanding production environments. The optimized geometry minimizes cutting forces and enhances chip control for consistent, repeatable results.
ISO Designation Breakdown
| ISO Catalog Code | SGS-SGS74155-1-4-6FL |
| Tool Category | Solid Carbide Drill — 6FL |
| Nominal Diameter | 6.35 mm (1/4") |
| Carbide Grade | PR1535 (Micro-Grain PVD Coated) |
| Tolerance Class | h5 (Premium) |
Engineering Dimensions & Geometry
| Parameter | Value | Tolerance |
|---|---|---|
| Cutting Diameter (D1) | 6.35 mm | h5 (+0.000 / -0.004 mm) |
| Overall Length (L1) | 75 mm | ±0.50 mm |
| Flute Length (L2) | 40 mm | ±0.30 mm |
| Shank Diameter (D2) | 6.35 mm | h6 (+0.000 / -0.009 mm) |
| Point Angle | 140° | ±1° |
| Helix Angle | 30° | ±1° |
| Core Thickness Ratio | 0.55 × D1 | — |
| Web Thickness | 0.20 × D1 | — |
Grade Details — Key Grade Characteristics
Grade PR1535 is a sub-micron grain carbide substrate (0.6 μm average grain size) combined with a multi-layer PVD TiAlN-based coating engineered specifically for universal drilling applications.
- Substrate: 10% Co binder micro-grain WC for superior edge retention and toughness
- Coating: Multi-layer PVD (TiAlN + TiSiN) providing heat resistance up to 850°C and low coefficient of friction
- Hardness: 1,650 HV30 for excellent wear resistance in continuous cutting
- Transverse Rupture Strength: ≥3,800 MPa ensuring stable drilling under high feed conditions
- Coating Adhesion: HF1 rating (highest) per ISO 20502, preventing flaking under thermal cycling
Grade Comparison Matrix
| Grade | Coating | Best For | Max Temp | Hardness |
|---|---|---|---|---|
| PR1535 ★ | PVD TiAlN+TiSiN | Steel, Stainless, Cast Iron | 850°C | 1,650 HV |
| PR1225 | PVD TiSiN | Hardened Steel >50 HRC | 900°C | 1,720 HV |
| CA6535 | CVD Al₂O₃+TiCN | Cast Iron, High Speed | 1,000°C | 1,580 HV |
| PR1705 | PVD AlCrN | Titanium & Ni-Based Alloys | 920°C | 1,700 HV |
Chipbreaker Profile
The six-flute configuration delivers closely spaced cutting edges that produce exceptional surface finish and hole straightness. The reduced chip load per flute enables higher feed rates while maintaining tight dimensional tolerance, ideal for high-volume production environments.
- Flute Surface Finish: Ra 0.15 μm (polished) to minimize built-up edge and adhesion
- Margin Width: 0.12 × D1 for stable wall contact and reduced vibration
- Margin Land: Narrow primary land (0.05 × D1) with honed edge (T-land) for clean entry
- Back Taper: 0.005 mm/mm on diameter to prevent binding in deep holes
Recommended Applications & Workpiece Materials
| Material Group | ISO Code | Machinability | Typical Components |
|---|---|---|---|
| Carbon & Alloy Steel | P.1 — P.6 | ★★★★★ Excellent | Shafts, gears, housings, flanges |
| Stainless Steel (Austenitic) | M.1 — M.2 | ★★★★☆ Very Good | Valves, fittings, medical implants |
| Gray & Ductile Cast Iron | K.1 — K.3 | ★★★★☆ Good | Engine blocks, pump housings, manifolds |
| Tool Steel (≤35 HRC) | P.7 — P.9 | ★★★★☆ Very Good | Molds, dies, fixture plates |
| Aluminum & Non-Ferrous | N.1 — N.3 | ★★★☆☆ Good* | Aircraft components, automotive trim |
*For aluminum and non-ferrous materials, reduce cutting speed by 15–20% and ensure adequate coolant to prevent built-up edge (BUE) formation.
Application Map by Operation
| Operation | Suitability | Max Depth | Notes |
|---|---|---|---|
| Through-hole Drilling | ★★★★★ Excellent | 5 × D | Optimal chip evacuation; use standard peck for >3×D |
| Blind-hole Drilling | ★★★★☆ Very Good | 3 × D | Use full retract peck cycle; leave 0.5 mm un-drilled |
| Counterboring | ★★★☆☆ Good | 1 × D | Reduce feed by 30%; ensure rigid setup |
| Enlarging / Reaming | ★★★★☆ Very Good | 3 × D | Pre-hole diameter 0.90–0.95 × D1 required |
| Cross-hole Drilling | ★★★☆☆ Good | 2 × D | Reduce feed by 40% at intersection; use guide bushing |
Recommended Cutting Conditions
| Workpiece Material | Cutting Speed (vc) | Feed per Rev (fn) | Coolant Strategy |
|---|---|---|---|
| Low-Carbon Steel (C<0.3%) | 90-110 m/min | 0.10-0.15 mm/rev | Internal + External flood |
| Alloy Steel (≤30 HRC) | 70-90 m/min | 0.08-0.12 mm/rev | Internal high-pressure (≥20 bar) |
| Stainless Steel (304/316) | 50-70 m/min | 0.08-0.12 mm/rev | Internal high-pressure; 8% emulsion |
| Gray Cast Iron (HB 180–260) | 90-120 m/min | 0.12-0.18 mm/rev | Dry or external mist (air/oil) |
| Aluminum Alloy (6061/7075) | 180-230 m/min | 0.14-0.20 mm/rev | Internal + External; water-based |
Note: Values are starting recommendations. Adjust based on machine rigidity, workpiece fixturing, and coolant delivery efficiency. For interrupted cuts or cross-holes, reduce vc by 20% and fn by 15%.
Operating Guidelines
- Tool Runout: Maintain total indicator runout (TIR) below 0.010 mm at the tool point for standard tolerance holes, and below 0.005 mm for H7-grade precision holes.
- Peck Drilling Cycle: For holes deeper than 2×D, employ a peck cycle with depth increments of 0.5–1.0×D. Full retract to break chips is mandatory for blind holes deeper than 3×D.
- Coolant Pressure: Internal coolant pressure must be ≥20 bar (290 psi) for effective chip evacuation in deep holes. Use 6–8% oil emulsion or synthetic coolant with EP additives.
- Entry Preparation: Chamfer or center-drill the entry surface at 90° to prevent burr formation and guide the drill concentrically. Chamfer width should be 0.2–0.3 × D1.
- Pre-hole for Enlarging: When using this drill to enlarge an existing hole, the pre-hole diameter must be 0.90–0.95 × D1 to ensure sufficient cutting engagement and prevent vibration.
- Spindle Warm-up: Run the spindle at operating speed for 5 minutes before production to stabilize thermal expansion and minimize initial hole oversize.
Toolholder Compatibility
| Holder Type | TIR Capability | Recommended For | Clamping Force |
|---|---|---|---|
| Hydraulic Chuck (HSK-A63 / BT40) | ≤0.003 mm | High-precision finishing, H7 holes | High, uniform |
| Shrink Fit Holder | ≤0.003 mm | High-speed machining (>10,000 rpm) | Very high |
| Precision Collet (ER25 / ER32) | ≤0.010 mm | General-purpose CNC drilling | Medium |
| Milling Chuck (Power Chuck) | ≤0.015 mm | Heavy-duty roughing, large diameters | Very high |
Packaging & Ordering Information
| Manufacturer Part Number (MPN) | SGS74155 |
| Packaging Unit | 1 piece per protective plastic tube; 10 tubes per master carton |
| Barcode | Industrial catalog item — assigned at shipment |
| Minimum Order Quantity | 1 piece (no MOQ) |
| Warranty | Standard Kyocera manufacturer defect warranty — 12 months from date of purchase |
| Storage Recommendation | Store in original packaging at 15–25°C, humidity <60% RH, away from corrosive vapors |
Catalog Meta Data
| Product Series | Kyocera SGS Solid Carbide Drill Series |
| Catalog Reference | Kyocera Precision Tools Catalog 2024–2026, Section D — Solid Carbide Drills |
| Document Revision | Rev. 4.1 (March 2026) |
| CAD / STEP Model | Available upon request — contact technical support with MPN |
| RoHS / REACH | Compliant — carbide substrate contains no restricted substances per EU Directive 2011/65/EU |
✓ Genuine Kyocera Product
| Manufacturer | Kyocera Corporation |
|---|---|
| Status | Verified Original Product |
| Quality Assurance | Guaranteed Genuine Kyocera Components |
発送・在庫情報
We ship worldwide through our strategic global logistics network. Products are dispatched directly from our international distribution facilities to ensure efficient delivery and customs clearance.
-
Stock Enquiries (在庫確認):
Contact our logistics team at sales.kyotow@gmail.com for real-time inventory status and dispatch location information. -
In-Stock Items (在庫あり):
Normally dispatched within 3 business days from the nearest regional warehouse. -
Factory Procurement (取寄せ):
Manufacturing and dispatch typically require 4–5 weeks. Once production begins, cancellations cannot be accommodated. -
Authenticity Guarantee (本物保証):
All products sold by Kyotow are 100% genuine and sourced through authorized Japanese and international distribution channels.
正確な製品情報
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.
返品・キャンセルポリシー
-
100% Accuracy Guarantee:
Full refund or replacement will be provided if the verified Kyocera item received differs from the official item code specified in your order confirmation. -
Order Finality:
Due to automated procurement systems connected directly to global factory distribution channels, orders cannot be modified or cancelled once processing has commenced. -
Technical Assistance:
Please verify machine compatibility, insert geometry, coating, and application grade before placing your order.
安全な決済方法
✓ Encrypted Transactions
✓ Global Buyer Protection
✓ Safe International Payments
All international payments are securely processed through PayPal, ensuring maximum transaction security and customer protection.
国際スピード郵便
✓ Full Shipment Tracking
✓ Global Logistics Network
✓ Flat Worldwide Shipping Rate: USD $50
Orders are shipped through our DHL Express corporate account from distribution facilities across Asia, Europe, and China for reliable international delivery.
Need Technical Assistance?
Contact our industrial tooling specialists for application support, tooling recommendations, datasheets, and compatibility verification.
sales.kyotow@gmail.comDirect 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.
