Kyocera SEKW421FN KW10 TWE00892 Milling Insert - Chamfering
- Stock: In Stock
- Model: Milling Inserts
- Weight: 0.07kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: TWE00892
Kyocera SEKW421FN KW10 Grade Uncoated Carbide, Indexable Milling Insert
Product Overview
The Kyocera SEKW421FN is a KW10-grade uncoated carbide 90° square milling insert optimized for back chamfering, chamfering, countersinking, v-shape slotting. Manufactured in Japan under ISO 9001:2015 quality standards, this insert combines an ultra-fine grain substrate with the FN finishing chipbreaker to deliver superior surface quality, efficient chip breaking, and maximum insert longevity in precision CNC operations.
The SEKW421FN features a sharp cutting edge with 20° clearance, purpose-built for chamfering, countersinking, and V-slotting. With 4 usable cutting edges per insert, it provides economical performance for deburring and edge-preparation workflows.
ISO Designation Breakdown
| ISO Designation Breakdown — SEKW421FN | |
|---|---|
| S | Square insert shape (90° included angle) |
| E | 20° clearance angle (single-sided relief) |
| K | Tolerance class: ±0.025 mm (IC), ±0.13 mm (T) |
| W | With hole (for clamping and chip evacuation) |
| 421 | Size 421: 1/2" inscribed circle, 1/8" thickness |
| FN | Chipbreaker: FN profile for finishing/chamfering |
Engineering Dimensions & Geometry
| Engineering Dimensions & Geometry | |
|---|---|
| Inscribed Circle (IC) | 1/2" |
| Insert Thickness | 1/8" |
| Nose Radius | 1/32" |
| Included Angle | 90° (square) |
| Clearance Angle | 20° (single-sided) |
| Number of Edges | 4 (indexable) |
| Hand | Neutral |
Grade Details — Key Grade Characteristics
| Grade Details — KW10 Key Characteristics | |
|---|---|
| Carbide Substrate | Ultra-fine grain tungsten carbide (0.5 μm grain size) |
| Cobalt Binder | 6% Co content for optimal toughness balance |
| Hardness | 92.5 HRA (≈ 1600 HV30) |
| Transverse Rupture Strength | 3,200 MPa |
| ISO Classification | K10 (ISO 513) |
| Coating | Uncoated (bare substrate for maximum sharpness) |
| Color Code | Gray (uncoated) |
Grade Comparison Matrix
| Grade | ISO | Hardness | Best For | Coating |
|---|---|---|---|---|
| KW10 | K10 | 92.5 HRA | Cast iron, non-ferrous, Ti alloys | Uncoated |
| KW20 | K20 | 91.0 HRA | Interrupted cuts, roughing | Uncoated |
| PR660 | P15-P25 | 92.0 HRA | Steel, stainless steel | PVD |
| CA510 | P10-P20 | 93.0 HRA | Hardened steel, finishing | CVD |
Chipbreaker Profile
| Chipbreaker Profile Analysis | |
|---|---|
| Profile Designation | FN — Finishing and chamfering chipbreaker |
| Geometric Description | Fine-pitch groove optimized for low-feed chamfering and countersinking |
| Rake Angle | Positive 5° |
| Chip Groove Depth | 0.10 mm (fine) |
| Edge Preparation | Sharp edge with 0.01 mm micro-hone |
| Intended Chip Form | 3–6 mm small segmented chips |
Recommended Applications & Workpiece Materials
The MCSE series 90° square insert is purpose-built for chamfering, countersinking, back chamfering, and V-shape slotting. The sharp KW10 cutting edge produces burr-free chamfers and precise countersinks.
- Cast Iron: Grey cast iron (FC250, FC300) — clean 45°/60° chamfers without edge breakout
- Non-Ferrous Metals: Aluminum, brass, copper — mirror-finish chamfers suitable for decorative edges
- Titanium Alloys: Controlled cutting edge for countersinking without galling
- Plastics: Clean V-slots and chamfers without melting or burr formation
Application Map by Operation
| Operation | Suitability | Remarks |
|---|---|---|
| Chamfering | ★★★★★ | Primary — 45°/60° chamfers with square insert |
| Countersinking | ★★★★★ | Precision countersinks for bolt holes |
| Back Chamfering | ★★★★☆ | Requires back-chamfer toolholder |
| V-Shape Slotting | ★★★★☆ | 90° V-grooves with multiple passes |
| General Milling | ★★★☆☆ | Not optimized for heavy stock removal |
Recommended Cutting Conditions
Parameters below serve as starting points. Optimize based on machine rigidity, coolant delivery, and workpiece condition:
| Material | Vc (m/min) | fz (mm/tooth) | ap (mm) | Coolant |
|---|---|---|---|---|
| Grey Cast Iron | 60–120 | 0.03–0.08 | 0.5–2.0 | Dry / Compressed air |
| Aluminum Alloy | 150–300 | 0.02–0.06 | 0.5–1.5 | Water-soluble / MQL |
| Brass / Bronze | 80–180 | 0.03–0.08 | 0.5–1.5 | Dry preferred |
| Titanium Alloy | 15–35 | 0.02–0.05 | 0.3–1.0 | High-pressure coolant |
Operating Guidelines
- Tool Setup: Ensure cutter body runout is below 0.01 mm TIR at the insert pocket. Excessive runout causes uneven wear and chatter.
- Edge Inspection: Inspect insert cutting edge under 10× magnification before installation. Replace if chipping exceeds 0.05 mm or flank wear (VB) exceeds 0.15 mm.
- Workpiece Fixturing: Rigid clamping is essential. Minimize overhang and use support for thin-walled workpieces to prevent vibration.
- Coolant Strategy: For cast iron and brass, dry machining is preferred to avoid thermal shock. For titanium, apply high-pressure coolant (70+ bar) directed at the cutting zone.
- Speed Ramping: Start at 70% of recommended Vc for the first 5 parts, then increase to 100% once tool wear stabilizes.
- Insert Indexing: Rotate to fresh edge every 45–60 minutes of cutting time or when flank wear reaches 0.15 mm.
- Storage: Keep inserts in original packaging until use. Avoid contact between cutting edges during storage.
Toolholder Compatibility
| Holder Series | Insert Size | Holder Type | Clamp System |
|---|---|---|---|
| MCSE-421 | 421/422 (1/2" IC) | Chamfer mill / countersink holder | Lever lock + center pin |
| MCSE-BC | 421/422 (1/2" IC) | Back-chamfer holder | Lever lock + center pin |
| MCSE-V | 421/422 (1/2" IC) | V-slotting cutter | Screw clamp |
Mounting Notes: Ensure center pin is fully seated before clamping. Torque lever screw to 2.0 N·m. Check insert flatness against holder seat.
Packaging & Ordering Information
| Packaging & Ordering Information | |
|---|---|
| Standard Pack Quantity | 10 inserts per plastic dispenser box |
| Bulk Pack Quantity | 100 inserts (10 boxes) per master carton |
| Individual Labeling | Each insert laser-marked with SEKW421FN and batch code |
| Shelf Life | Indefinite when stored in original packaging (dry environment) |
| Minimum Order | 1 box (10 inserts) |
| MPN for Ordering | TWE00892 |
| Country of Origin | Japan |
Catalog Meta Data
| Catalog Meta Data | |
|---|---|
| Product Family | Kyocera Precision Tools — Indexable Inserts |
| Series Code | MCSE |
| Style Code | SEKW |
| E-Commerce SKU | TWE00892 |
| Last Catalog Update | 2026-Q2 |
| Regulatory Compliance | RoHS 3, REACH, ISO 9001:2015 manufacturing |
| Warranty | Standard Kyocera manufacturer warranty against material and workmanship defects |
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