4-Flute · nACo · R1mm · HRC65 · Standard Reach
8mm 4-Flute R1mm nACo Solid Carbide Corner Radius End Millfor HRC65 Hardened Steel
nACo (nano-AlCrN composite) corner radius end mills deliver the highest performance tier for hard milling in die steel, tool steel, and hardened components up to HRC65. The corner radius geometry is especially critical at high hardness — it eliminates the notching failure mode that destroys sharp-corner tools in hardened steel. Combined with nACo's 3,800 HV hardness and 1,100°C oxidation resistance, this tool enables dry semi-finish and finish passes in H13, P20, D2, and S7 mould steel directly after heat treatment.
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Reference price
$34.28
Ref. factory price (USD)
Based on rod stock cost as of 2026-03-31. Final quotation may differ.
8mm 4F R1mm nACo
L2 20mm · D2 8mm · OAL 60mm
Standard Reach · HRC65
✓ Factory direct pricing
✓ MOQ 1 piece, ships 1–5 days
✓ Custom radius in 0.1mm increments
Full Dimensions
Technical Specifications
| Corner Radius | 1 mm |
| Cutter Diameter (D1 h7) | 8 mm |
| Flute Length (L2) | 20 mm |
| Shank Diameter (D2 h6) | 8 mm |
| Overall Length (L1) | 60 mm |
| Number of Flutes | 4 |
| End Geometry | Corner Radius (Bull Nose) |
| Coating | nACo Nano-AlCrN composite |
| Max Material Hardness | HRC65 |
| Reach Category | Standard (L1/D1 = 7.5×) |
| Helix Angle | 30°–35° |
| Substrate | K10/K20 Ultra-Fine Grain Carbide |
| Shank Tolerance | h6 |
| MOQ | 1 piece |
| Lead Time (standard) | 1–5 business days |
| Lead Time (custom) | 5–15 business days |
nACo · 4 Flute · HRC65 · R1mm
R1mm Corner Geometry
General-purpose fillet milling — strongest corner geometry for heavy passes
- ▸Maximum radial support on cutting edge during heavy DOC passes
- ▸Ideal for semi-finish passes before a smaller-radius finishing pass
- ▸Produces clean R1mm fillets in one pass — no secondary operation
- ▸Recommended for die cast tooling, injection mould cores, and structural pockets
ø8mm Applications
8mm nACo — Where This Tool Fits
- ▸Automotive component shoulder milling
- ▸Pump body and valve pocket features
- ▸Gearbox cover profiling
- ▸Large mould runner channel machining
Coating Performance
nACo on Corner Radius Geometry
- ▸nACo hardness > 3,800 HV — critical for corner edge stability in HRC65 steel
- ▸Oxidation to 1,100°C — supports dry cutting in deep die pockets
- ▸Corner radius + nACo eliminates notching failure common in hard milling
- ▸Enables direct finish after heat treatment — skip grinding on mould steel
Same Diameter & Radius, Different Reach
ø8mm R1mm nACo · 4 Flute · HRC65 — Other Flute Lengths
Same ø8mm Diameter, Other Radii
nACo · 4 Flute · HRC65 — Other Corner Radii at ø8mm
Same Dimensions, Other Coatings
ø8mm R1mm / L2 20mm — Other Variants
Order 8mm R1mm 4-Flute nACo Today
Factory direct. MOQ 1 piece. Pricing confirmed within 4 hours.