4-Flute · nACo · R0.3mm · HRC65 · Standard Reach

4mm 4-Flute R0.3mm nACo Solid Carbide Corner Radius End Millfor HRC65 Hardened Steel

Name: 4mm 4-Flute R0.3mm nACo Corner Radius End Mill for HRC65
Brand: Solid Carbide Direct
SKU: SCD-CREM-NACO-4F-D4-R03-L8
Price: 9 USD
Availability: InStock

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.

R0.3mmD1 4mmL2 8mmD2 4mmOAL 50mm4 FlutesnACoHRC65Standard ReachMOQ 1 pc

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Cena referencyjna

34,02 zł

Cena ref. fabryki (PLN)

wg kosztu pręta na 2026-03-31. Wycena końcowa może się różnić.

4mm 4F R0.3mm nACo

L2 8mm · 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 Radius	0.3 mm
Cutter Diameter (D1 h7)	4 mm
Flute Length (L2)	8 mm
Shank Diameter (D2 h6)	4 mm
Overall Length (L1)	50 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 = 12.5×)
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 · R0.3mm

Corner R

0.3mm

D1 h7

4mm

8mm

D2 h6

4mm

50mm

Reach

Standard

R0.3mm Corner Geometry

Light edge protection for tight-tolerance pocket corners

▸Prevents corner micro-fracture in interrupted cuts
▸Works within tight pocket radius tolerances (e.g. R0.3 ± 0.05mm)
▸Preferred radius for watch and instrument component pockets
▸Usable on features requiring clean corner breaks in cast iron

Radius Selection Tip: R0.3mm suits precision pockets where a larger radius would violate the design fillet spec. In HRC65 steel, this radius absorbs chip impact without generating visible corner burrs. Verify pocket design tolerance before specifying — most CAD models default to R0.5mm.

ø4mm Applications

4mm nACo — Where This Tool Fits

▸Mould cavity pocket semi-finishing
▸Precision aerospace part profiling
▸Hydraulic manifold pocket corners
▸Small fixture and jig features

Machining Tip: ø4mm with corner radius provides the best size-to-stiffness ratio for die and mould work. In HRC65 steel, the corner radius allows 3–5×D axial depth without the micro-chipping that limits sharp-corner tools. Ideal for continuous shoulder milling passes.

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 ø4mm Diameter, Other Radii