Kyocera ENDMILL TiN SGS31579 2FL Sq | End Mill - Steel Kyotow.com
- Stock: In Stock
- Model: ENDMILL
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: SGS31579
Product Overview
The Kyocera SGS31579 is a Series 15 solid carbide end mill from the Kyocera SGS Precision Tools general-application program. It features a 1/2″ (12.7 mm) cutting diameter, 2 flutes with a 30° helix, a square end geometry and a Ti-NAMITE® (TiN) coating on a tough micrograin carbide substrate. As a double-end tool it carries an identical cutting geometry on both ends of the shank — when one end wears, simply flip the tool, doubling the value of every piece. Engineered for economical slotting and profiling with maximum chip space and a cutting end on both sides of the tool, it delivers reliable, high-precision milling performance across steels, stainless steels, cast irons and non-ferrous alloys.
ISO Designation Breakdown
The table below decodes every element of the catalog designation and the geometry class it assigns to this tool.
| Code Element | Meaning | Detail |
|---|---|---|
| SGS | Brand / Program | Kyocera SGS Precision Tools — solid carbide rotary tool program of Kyocera Corporation |
| 31579 | EDP Number | Catalog EDP identifying Series 15 — 2 Flute, Double End, Square End, Fractional |
| Series 15 | Tool Series | Economical slotting and profiling with maximum chip space and a cutting end on both sides of the tool |
| Flute Count | Geometry | 2 flutes, 30° right-hand helix, right-hand cut, double end |
| End Style | Geometry | Square end with sharp corner |
| Coating Option | Grade | Ti-NAMITE® (TiN) coated |
Applicable workpiece material groups (ISO 513): P (steels), M (stainless steels), K (cast irons), N (non-ferrous), S (heat-resistant alloys, reduced parameters).
Engineering Dimensions & Geometry
| Dimension | Value (in) | Value (metric) |
|---|---|---|
| Cutting diameter DC | 1/2″ | 12.7 mm |
| Length of cut APMX (per end) | 5/8″ | 15.875 mm |
| Overall length LF | 3″ | 76.2 mm |
| Shank diameter DCON | 1/2″ | 12.7 mm |
| Geometry Parameter | Specification |
|---|---|
| Cutting diameter tolerance DC | +0.000 / –0.002 in |
| Shank tolerance DCON | h6 |
| End geometry | Square end, sharp corner |
| Helix angle | 30° right-hand |
| Number of flutes | 2 |
| Cutting direction | Right-hand cut, center cutting |
| Configuration | Double end — identical cutting geometry on both ends |
| Shank style | Plain cylindrical shank |
Grade Details - Key Grade Characteristics
Substrate: premium micrograin solid carbide engineered for an optimal balance of wear resistance and transverse rupture strength in general-purpose milling.
| Characteristic | Specification |
|---|---|
| Coating | Ti-NAMITE® (TiN), PVD applied — gold finish |
| Coating micro-hardness | ≈ 2,300 HV 0.05 |
| Thermal stability | up to ≈ 600°C at the cutting edge |
| Friction behavior | Low-friction gold layer reduces built-up edge and eases chip flow |
| Best suited for | General steels and low-alloy steels at moderate speeds; also stainless and cast iron |
| Key benefit | Extended tool life versus uncoated carbide with excellent edge lubricity |
Grade Comparison Matrix
| Grade Variant | Coating | Color | Hardness | Max Service Temp. | Preferred Application |
|---|---|---|---|---|---|
| Uncoated (Bright) | None | Silver-gray | ≈1,600–1,800 HV | ≈800°C | Aluminum, copper alloys, plastics, general steels |
| Ti-NAMITE® (TiN) ✓ this product | PVD TiN | Gold | ≈2,300 HV | ≈600°C | General steels, low-alloy steels at moderate speeds |
| Ti-NAMITE®-C (TiCN) | PVD TiCN | Blue-gray | ≈3,000 HV | ≈400°C | Abrasive materials, cast irons, wear-critical cuts |
| Ti-NAMITE®-A (AlTiN) | PVD AlTiN | Black / charcoal | ≈3,300 HV | ≈900°C | Steels, stainless, high-temp alloys, dry milling |
Each geometry in this series is offered in multiple grade variants under different EDP numbers; the EDP on this page corresponds to the variant marked above.
Chipbreaker Profile
The 2-flute, 30° helix design provides the largest possible chip gullet in this diameter class. The open flute valleys act as an integral chip-evacuation channel, preventing chip packing in deep slots and in soft, stringy materials such as aluminum and low-carbon steels.
| Feature | Specification | Function |
|---|---|---|
| Helix angle | 30° | Balances shearing action and edge strength |
| Flute count | 2 | Maximum chip space |
| Chip gullet | Deep, polished | Fast, unobstructed chip evacuation |
| Edge preparation | Honed micro-edge | Stable cut entry, reduced micro-chipping |
| Relief | Eccentric primary relief | Lower friction and heat at the flank |
Recommended Applications & Workpiece Materials
| Workpiece Material Group (ISO 513) | Suitability | Notes |
|---|---|---|
| P — Carbon & alloy steels (1018, 1040, 4140, 8620) | ★★★★☆ | Recommended — classic TiN application |
| M — Stainless steels (303, 304, 316, 17-4 PH) | ★★★☆☆ | Use with flood coolant |
| K — Cast irons (gray, ductile) | ★★★★☆ | Very good wear resistance |
| N — Aluminum & copper alloys, plastics | ★★★★☆ | Very good — low built-up edge |
| S — Titanium & heat-resistant alloys | ★★☆☆☆ | Reduced speed/feed; rigid setup |
| H — Hardened steels ≤ 45 HRc | ★☆☆☆☆ | Light finishing passes only |
Application Map by Operation
| Milling Operation | Suitability & Notes |
|---|---|
| Slotting | ✓ Excellent — 2-flute chip space |
| Profiling / side milling | ✓ Very good |
| Pocketing | ✓ Very good |
| Ramping / helical interpolation | ✓ Good |
| 3D contouring / die & mold | — not applicable (square end) |
| Finishing | ✓ Good |
Recommended Cutting Conditions
Catalog starting values for a 1/2″, 2-flute tool. Profile: Ae ≤ 0.25×DC, Ap ≤ 1.5×DC. Slot: Ae = 1×DC, Ap ≤ 0.4–1×DC (2FL: ≤1×DC with reduced Fz). Reduce speed and feed for harder material conditions; for finishing reduce feed and Ae (≤ 0.02×DC).
| Material Group | Vc Profile / Slot (sfm) | Fz (ipt) | RPM Profile | Feed Profile (ipm) | RPM Slot | Feed Slot (ipm) |
|---|---|---|---|---|---|---|
| Carbon Steels (1018, 1040, 12L15) | 460 / 335 | 0.00200 | 3,510 | 14.06 | 2,560 | 10.24 |
| Alloy Steels (4140, 4150, 8620) | 335 / 245 | 0.00150 | 2,560 | 7.68 | 1,870 | 5.62 |
| Stainless Steels (304, 316, 17-4 PH) | 255 / 185 | 0.00120 | 1,950 | 4.68 | 1,410 | 3.39 |
| Cast Irons (Gray, Ductile) | 335 / 245 | 0.00200 | 2,560 | 10.24 | 1,870 | 7.49 |
| Aluminum Alloys (6061, 7075) | 880 / 640 | 0.00400 | 6,720 | 53.79 | 4,890 | 39.12 |
Formulas: RPM = (Vc × 3.82) / DC • Feed (ipm) = Fz × number of flutes × RPM.
Operating Guidelines
- Hold total indicated runout (TIR) below 0.0004″ (0.01 mm); micro-diameter tools are extremely sensitive to runout.
- Use the shortest possible tool overhang and a rigid, balanced holder; avoid extending the flute length requirement.
- Start at the lower end of the recommended speed/feed window and increase in steps while observing chip color and spindle load.
- For finishing passes, reduce radial engagement to ≤ 0.02×DC and reduce feed accordingly for best surface quality.
- Prefer climb milling for best surface finish and tool life on machines with minimal backlash.
- Use flood coolant or air blast appropriate to the material; for AlTiN-coated tools, dry machining or MQL is often optimal in steels.
- Do not dwell or rub in the cut — maintain positive feed to prevent work hardening, especially in stainless steels.
- Inspect the cutting edge regularly under magnification; replace at the first sign of flank wear > 0.004″ to protect part accuracy.
- Double-end tool: when the first cutting end reaches its wear limit, reverse the tool in the collet to use the fresh second end.
Toolholder Compatibility
Shank diameter: 1/2″ (12.7 mm), tolerance h6. Holder compatibility for this configuration:
| Holder System | 
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