4-Flute · nACo · R1mm · HRC65 · Standard Reach

8mm 4-Flute R1mm nACo Solid Carbide Corner Radius End Millfor HRC65 Hardened Steel

Name: 8mm 4-Flute R1mm nACo Corner Radius End Mill for HRC65
Brand: Solid Carbide Direct
SKU: SCD-CREM-NACO-4F-D8-R1-L25
Price: 42.85 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.

R1mmD1 8mmL2 25mmD2 8mmOAL 75mm4 FlutesnACoHRC65Standard ReachMOQ 1 pc

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Richtpreis

37,56 €

Richtpreis Werk (EUR)

Basierend auf Stabmaterial-Stand per 2026-03-31. Endgültiges Angebot kann abweichen.

8mm 4F R1mm nACo

L2 25mm · D2 8mm · OAL 75mm

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	1 mm
Cutter Diameter (D1 h7)	8 mm
Flute Length (L2)	25 mm
Shank Diameter (D2 h6)	8 mm
Overall Length (L1)	75 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 = 9.4×)
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

Corner R

1mm

D1 h7

8mm

25mm

D2 h6

8mm

75mm

Reach

Standard

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

Radius Selection Tip: R1mm provides the highest edge strength of commonly used radii. In HRC65 steel, DOC can be increased 20–30% over R0.5mm without chatter. Use for semi-finish passes that must leave a consistent stock allowance before a ball-nose finish.

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

Machining Tip: ø8mm is the production sweet spot for corner radius end mills. In HRC65 steel, radial engagement can be 30–50% of D for profiling, with DOC up to 1×D for semi-finish passes. The corner radius reduces chatter significantly at this diameter.

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 Diameter & Radius, Different Reach