Kyocera SGS31781 TC 4FLBN Endmill | Carbide Mill - CNC Kyotow.com
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- Stock: In Stock
- Model: ENDMILL
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: SGS31781
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1. Product Overview
The Kyocera SGS31781 is a precision-engineered solid carbide 4FL BN endmill featuring the TiCN (Titanium Carbonitride) grade system. Designed for high-volume production in CNC machining centers, this 3/16 diameter tool delivers exceptional dimensional accuracy, surface finish quality, and extended tool life across a wide spectrum of workpiece materials.
Manufactured in Japan using premium micro-grain carbide substrates and advanced PVD coating technology, the SGS31781 series represents Kyocera's commitment to precision tooling for demanding aerospace, automotive, mold & die, and general engineering applications.
2. ISO Designation Breakdown
| Designation Element | Description |
|---|---|
| Series Code | SGS – Solid Carbide General / Specialized Endmill |
| Size | 3/16″ (4.76 mm) Cutting Diameter |
| Flute Count | 4FL – Four-flute for finish and stability |
| End Type | BN – Ball Nose End |
| Grade/Coating | TC – TiCN (Titanium Carbonitride) |
| MPN | SGS31781 |
| Full ISO | SGS-3_16-4FL-BN-TC |
3. Engineering Dimensions & Geometry
| Parameter | Value |
|---|---|
| Cutting Diameter (D1) | 3/16″ / 4.76 mm |
| Shank Diameter (D2) | 6.35 mm |
| Overall Length (L1) | 57 mm |
| Flute Length (L2) | 16 mm |
| Neck Diameter | - |
| Corner Radius | 0.0 mm |
| Helix Angle | 35° |
| Core Thickness | 3.57 mm |
| Rake Angle | 6° |
| Clearance Angle | 8° |
| Gash Width | 1.05 mm |
| Tolerance (h6) | -0.000 / -0.009 mm |
| Runout | ≤ 5 µm |
| Surface Finish (Flute) | Ra 0.2 µm |
4. Grade Details – Key Grade Characteristics
| Characteristic | Specification |
|---|---|
| Grade Designation | TC |
| Coating Composition | TiCN (Titanium Carbonitride) |
| Coating Color | Blue-Grey |
| Max Operating Temp | 400°C |
| Coating Hardness | 3,000 HV |
| Friction Coefficient | 0.3 |
| Substrate Grade | Ultra-Fine Grain WC-Co (0.6 µm) |
| Coating Method | PVD (Physical Vapor Deposition) |
| Coating Thickness | 2-4 µm |
Performance Summary: TiCN coating offers superior hardness and abrasive wear resistance. Perfect for high-speed machining of hardened steels and abrasive materials.
5. Grade Comparison Matrix
| Grade | Coating | Hardness | Temp Limit | Best For |
|---|---|---|---|---|
| CA | Uncoated | 1,600 HV | — | Aluminum, Non-Ferrous |
| TN | TiN | 2,300 HV | 600°C | General Steel, SS |
| TC | TiCN | 3,000 HV | 400°C | Hardened Steel |
| TA | TiAlN | 3,300 HV | 900°C | Titanium, Inconel |
6. Chipbreaker / Flute Profile
Tight-core 4-flute design with reduced gash width for increased core strength. Optimized for finishing and semi-finishing with superior surface finish.
| Flute Parameter | Value / Description |
|---|---|
| Flute Count | 4FL |
| Helix Angle | 35° |
| Core Thickness | 3.57 mm |
| Gash Width | 1.05 mm |
| Edge Prep | Micro-honing 0.02 mm |
| Chip Evacuation | Controlled chip curl, ideal for shallow depths and finishing |
7. Recommended Applications & Workpiece Materials
Primary Materials: Hardened Steel (up to 55 HRC), Tool Steel, Alloy Steel, Cast Iron
| Material | Machinability | Recommended? | Notes |
|---|---|---|---|
| Carbon Steel (≤ 45 HRC) | Good | ✓ Yes | Excellent chip control |
| Alloy Steel (≤ 50 HRC) | Good | ✓ Yes | Use TN or TC grade |
| Stainless Steel 304/316 | Moderate | ✓ Yes | TA grade recommended for 316 |
| Cast Iron (Gray/Ductile) | Good | ✓ Yes | High-speed capable |
| Aluminum Alloys | Excellent | ✓ Yes | CA grade preferred |
| Hardened Steel (50-55 HRC) | Moderate | △ With Care | TC grade only |
| Titanium Ti-6Al-4V | Difficult | △ With Care | TA grade, low speeds |
| Inconel 718 | Difficult | △ With Care | TA grade, rigid setup |
8. Application Map by Operation
| Operation | Suitability | Recommended Parameters |
|---|---|---|
| Slotting (Full Width) | △ Moderate | ap = 3.8 mm, ae = D1 |
| Side Profiling | ✓ Excellent | ap = 1×D1, ae = 0.2×D1 |
| Contour Finishing | ✓ Excellent | ap = 0.5×D1, ae = 0.1×D1 |
| Plunging | ✗ Not Recommended | Peck cycle recommended |
| Ramp Milling | ✓ Good | Max 15° ramp angle |
| Helical Interpolation | ✓ Good | Entry dia ≥ 1.2×D1 |
9. Recommended Cutting Conditions
| Material | Vc (m/min) | fz (mm/tooth) | ap (mm) | ae (mm) |
|---|---|---|---|---|
| Carbon Steel | 100-150 | 0.02-0.06 | 3.8 | 0.2×D1 |
| Stainless Steel | 80-110 | 0.015-0.05 | 3.8 | 0.15×D1 |
| Cast Iron | 90-120 | 0.03-0.07 | 3.8 | 0.25×D1 |
| Aluminum | 200-300 (CA grade only) | 0.04-0.10 | 3.8 | 0.3×D1 |
Note: Values are starting recommendations. Adjust based on machine rigidity, coolant delivery, and workpiece fixturing. For TC grade, reduce speeds by 15% when machining materials above 40 HRC.
10. Operating Guidelines
- Runout Check: Ensure tool runout is ≤ 5 µm at the tool tip. Excessive runout reduces tool life by 30-50%.
- Coolant: Flood coolant recommended for steel and stainless steel. For aluminum with CA grade, air blast or mist is acceptable. TA grade supports dry machining on titanium.
- Entry Strategy: Use helical interpolation or ramp entry. Avoid direct plunging with square endmills.
- Chip Evacuation: Maintain adequate coolant pressure (≥ 20 bar for deep pockets) to prevent chip recutting.
- Depth of Cut: Do not exceed 3.8 mm axial depth in slotting without pecking or chipbreaker cycles.
- Speed Ramp: Start at 70% of recommended Vc and increase gradually to optimize tool life.
- Tool Inspection: Inspect cutting edges after 30 minutes of cut time. Look for coating flaking or edge chipping.
11. Toolholder Compatibility
| Holder Type | Compatibility | Notes |
|---|---|---|
| ER Collet Chuck (ER16-ER32) | ✓ Compatible | Ensure collet size matches shank diameter exactly |
| Shrink Fit Holder | ✓ Recommended | Best for high-speed machining; provides 3× grip force |
| Hydraulic Expansion Chuck | ✓ Compatible | Excellent damping for finishing operations |
| Milling Chuck (KM / HSK) | ✓ Compatible | Use for heavy-duty roughing |
| Side-Lock (Weldon) Holder | △ Caution | May cause runout > 10 µm; not recommended for finishing |
Shank Diameter: 6.35 mm (h6 tolerance). Use holder with matching bore and ≤ 3 µm TIR at 4×D projection.
12. Packaging & Ordering Information
| Item | Details |
|---|---|
| Manufacturer Part Number | SGS31781 |
| Packaging | Individual plastic tube with rubber end caps; 10 pcs per inner box |
| Labeling | Laser-etched diameter and MPN on shank; color ring identifies grade |
| Minimum Order | 1 piece |
| Bulk Pricing | Available for orders ≥ 50 pieces; contact sales@kyotow.com |
| Stock Status | Usually ships within 24-48 hours |
| Warranty | 12-month manufacturer defect warranty from Kyocera |
13. Catalog Meta Data
| Field | Value |
|---|---|
| Catalog Series | Kyocera SGS Solid Carbide Endmill |
| Page Reference | 2026 Industrial Catalog, Vol. 3, p. 145-148 |
| Replacement For | General-purpose solid carbide endmills in 3/16 diameter |
| Cross Reference | Compatible with all standard ER collet and shrink-fit systems |
| Revision Date | 2026-05-15 |
| ECCN | EAR99 |
| HS Code | 8207.70.40 |
| Country of Origin | Japan |
Need application support? Our CNC tooling engineers can help you select the optimal grade, speed, and feed parameters for your specific material. Contact us at support@kyotow.com or use our live chat for instant assistance.
✓ 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.
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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
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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.
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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.
