4-Flute · nACo · R0.2mm · HRC65 · Standard Reach

1.5mm 4-Flute R0.2mm 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.

R0.2mmD1 1.5mmL2 4mmD2 4mmOAL 50mm4 FlutesnACoHRC65Standard ReachMOQ 1 pc

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Reference price

$7.84

Ref. factory price (USD)

Based on rod stock cost as of 2026-03-31. Final quotation may differ.

nACo · 4 Flute · HRC65

1.5mm 4F R0.2mm nACo

L2 4mm · D2 4mm · OAL 50mm

Standard Reach · HRC65

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✓ Factory direct pricing

✓ MOQ 1 piece, ships 1–5 days

✓ Custom radius in 0.1mm increments

Full Dimensions

Technical Specifications

Corner Radius0.2 mm
Cutter Diameter (D1 h7)1.5 mm
Flute Length (L2)4 mm
Shank Diameter (D2 h6)4 mm
Overall Length (L1)50 mm
Number of Flutes4
End GeometryCorner Radius (Bull Nose)
CoatingnACo Nano-AlCrN composite
Max Material HardnessHRC65
Reach CategoryStandard (L1/D1 = 33.3×)
Helix Angle30°–35°
SubstrateK10/K20 Ultra-Fine Grain Carbide
Shank Toleranceh6
MOQ1 piece
Lead Time (standard)1–5 business days
Lead Time (custom)5–15 business days

nACo · 4 Flute · HRC65 · R0.2mm

1.5mm 4-flute R0.2mm nACo corner radius end mill — L2=4mm OAL=50mm
Corner R
0.2mm
D1 h7
1.5mm
L2
4mm
D2 h6
4mm
L1
50mm
Reach
Standard

R0.2mm Corner Geometry

Micro edge protection — minimal corner rounding for near-sharp corner features

  • ▸Virtually sharp corner appearance while eliminating micro-chipping
  • ▸Ideal where fillet radius tolerance is ± 0.05mm
  • ▸Extends tool life vs true sharp-corner tools by 30–50%
  • ▸Suitable for precision mould parting surfaces and embossed lettering
Radius Selection Tip: R0.2mm is the tightest corner radius standard. In HRC65 steel, the R0.2mm arc is small enough to appear visually sharp but prevents the notching failure that destroys zero-radius tools. Use identical step-over and depth parameters as you would for a square end mill.

ø1.5mm Applications

1.5mm nACo — Where This Tool Fits

  • ▸Precision instrument and watch component features
  • ▸Medical device micro-pocket machining
  • ▸Die insert fine detail features
  • ▸Electronic connector pocket profiling
Machining Tip: ø1.5mm corner radius end mills need ≤ 0.003mm spindle runout. In HRC65 steel, use 0.01–0.04 mm/tooth chip load; the corner radius geometry reduces tool tip stress allowing slightly higher chip load than equivalent sharp-corner tools.

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
ISO HISO PnACo corner radius end mill HRC654 flute bull nose end mill hardened steelcorner radius carbide end mill hard millingradius end mill die steel HRC65

Same ø1.5mm Diameter, Other Radii

nACo · 4 Flute · HRC65 — Other Corner Radii at ø1.5mm

R0.3mm
L2 4mm

Same Dimensions, Other Coatings

ø1.5mm R0.2mm / L2 4mm — Other Variants

TiSiN · 4 Flute · HRC55
TiSiN · 4 Flute · HRC55
HRC55 · 4F · R0.2mm
Uncoated · 4 Flute · Aluminium
Uncoated · 4 Flute · Aluminium
Non-Ferrous · 4F · R0.2mm
ø1mm R0.2mm / L2 3mm← All Corner Radius End Millsø2mm R0.2mm / L2 6mm

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