Kyocera ENDMILL Uncoated SGS31590 BN Set | Endmill - Steel Kyotow.com
- Stock: In Stock
- Model: ENDMILL
- Weight: 0.10kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: SGS31590
Product Overview
The Kyocera SGS31590 is a 6-piece Series 15B solid carbide end mill set from the Kyocera SGS Precision Tools general-application program. The set covers the six most-used fractional diameters — 1/8″, 3/16″, 1/4″, 5/16″, 3/8″ and 1/2″ — in a 2-flute ball nose configuration with a 30° helix and uncoated bright-finish micrograin carbide. Each tool is double ended, doubling the number of cutting ends in the box. It is a versatile workshop and toolroom set for general milling in steels, stainless steels, cast irons and non-ferrous materials, giving the machinist a complete diameter range in a single, ready-to-run package.
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 |
| 31590 | EDP Number | Catalog EDP identifying Series 15B — 2 Flute, Double End, Ball Nose, Fractional |
| Series 15B | Tool Series | Economical 3D contouring and slotting with a full-radius ball nose cutting end on both sides of the tool |
| Set Configuration | Contents | 6 double-end end mills: 1/8, 3/16, 1/4, 5/16, 3/8, 1/2 inch |
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
All six tools in the set share the same 2-flute, 30° helix geometry. Dimensions per set member:
| Cutting Dia. DC (in) | DC (mm) | Length of Cut APMX (in) | APMX (mm) | Overall Length LF (in) | LF (mm) | Shank Dia. DCON (in) |
|---|---|---|---|---|---|---|
| 1/8″ | 3.175 mm | 1/4″ | 6.35 mm | 1-1/2″ | 38.1 mm | 1/8″ |
| 3/16″ | 4.762 mm | 3/8″ | 9.525 mm | 2″ | 50.8 mm | 3/16″ |
| 1/4″ | 6.35 mm | 1/2″ | 12.7 mm | 2-1/2″ | 63.5 mm | 1/4″ |
| 5/16″ | 7.938 mm | 1/2″ | 12.7 mm | 2-1/2″ | 63.5 mm | 5/16″ |
| 3/8″ | 9.525 mm | 9/16″ | 14.287 mm | 2-1/2″ | 63.5 mm | 3/8″ |
| 1/2″ | 12.7 mm | 5/8″ | 15.875 mm | 3″ | 76.2 mm | 1/2″ |
| Parameter | Value |
|---|---|
| Cutting diameter tolerance DC | +0.000 / –0.002 in (≥1/8″) |
| Shank tolerance DCON | h6 |
| Helix angle | 30° right-hand |
| Flute configuration | 2 flute, double end, ball nose (RE = DC/2) |
| Cutting direction | Right-hand cut, center cutting |
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 |
|---|---|
| Finish | Uncoated, bright (ground) cutting edges |
| Edge condition | Extremely sharp, free-cutting edge with low cutting forces |
| Substrate hardness | ≈ 1,600–1,800 HV (micrograin carbide) |
| Best suited for | Aluminum and non-ferrous alloys, copper alloys, plastics; also general steels at moderate parameters |
| Key benefit | Mirror-finish capability and maximum edge sharpness; no coating layer to round the micro-edge |
Grade Comparison Matrix
| Grade Variant | Coating | Color | Hardness | Max Service Temp. | Preferred Application |
|---|---|---|---|---|---|
| Uncoated (Bright) ✓ this product | None | Silver-gray | ≈1,600–1,800 HV | ≈800°C | Aluminum, copper alloys, plastics, general steels |
| Ti-NAMITE® (TiN) | 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. The ball nose radius blends smoothly into the flute form, producing a continuous chip flow in 3D contouring and eliminating sharp corner stress concentrations.
| 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) | ★★★★☆ | Very good at moderate parameters |
| M — Stainless steels (303, 304, 316, 17-4 PH) | ★★★☆☆ | Use with flood coolant |
| K — Cast irons (gray, ductile) | ★★★★☆ | Very good |
| N — Aluminum & copper alloys, plastics | ★★★★★ | First choice — mirror finishes |
| 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 — open gullets clear chips |
| Profiling / side milling | ✓ Very good |
| Pocketing | ✓ Very good |
| Ramping / helical interpolation | ✓ Good |
| 3D contouring / die & mold | ✓ Excellent — full ball radius |
| Finishing | ✓ Good — use ≤0.02×DC radial engagement |
Recommended Cutting Conditions
Speed/feed starting values per set member, profiling in carbon steel (Vc = 460 sfm, Ae ≤ 0.25×DC, Ap ≤ 1.5×DC). Scale to other materials with the multipliers below; reduce feed and Ae for finishing (≤0.02×DC).
| Cutter Dia. | Fz (ipt) | Profile RPM | Profile Feed (ipm) | Slot RPM | Slot Feed (ipm) |
|---|---|---|---|---|---|
| 1/8″ | 0.00030 | 14,060 | 8.4 | 10,240 | 6.1 |
| 3/16″ | 0.00053 | 9,370 | 10.0 | 6,830 | 7.3 |
| 1/4″ | 0.00080 | 7,030 | 11.2 | 5,120 | 8.2 |
| 5/16″ | 0.00113 | 5,620 | 12.7 | 4,100 | 9.3 |
| 3/8″ | 0.00150 | 4,690 | 14.1 | 3,410 | 10.2 |
| 1/2″ | 0.00200 | 3,510 | 14.1 | 2,560 | 10.2 |
| Material Group | Speed Multiplier vs. Carbon Steel |
|---|---|
| Carbon steels (1018, 1040) | 
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