4-Flute · nACo · R2.5mm · HRC65 · Standard Reach

6mm 4-Flute R2.5mm nACo Solid Carbide Corner Radius End Millfor HRC65 Hardened Steel

Name: 6mm 4-Flute R2.5mm nACo Corner Radius End Mill for HRC65
Brand: Solid Carbide Direct
SKU: SCD-CREM-NACO-4F-D6-R25-L15
Price: 16.95 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.

R2.5mmD1 6mmL2 15mmD2 6mmOAL 50mm4 FlutesnACoHRC65Standard ReachMOQ 1 pc

Get Pricing & Stock

Cena referencyjna

64,07 zł

Cena ref. fabryki (PLN)

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

6mm 4F R2.5mm nACo

L2 15mm · D2 6mm · OAL 50mm

Standard Reach · HRC65

WhatsApp Quote Email RFQ Use contact form →

✓ Factory direct pricing

✓ MOQ 1 piece, ships 1–5 days

✓ Custom radius in 0.1mm increments

Full Dimensions

Technical Specifications

Corner Radius	2.5 mm
Cutter Diameter (D1 h7)	6 mm
Flute Length (L2)	15 mm
Shank Diameter (D2 h6)	6 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 = 8.3×)
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 · R2.5mm

Corner R

2.5mm

D1 h7

6mm

15mm

D2 h6

6mm

50mm

Reach

Standard

R2.5mm Corner Geometry

Maximum standard corner radius — structural fillet finishing and heavy pocketing

▸Largest standard corner radius for high-load structural pockets
▸One tool for both side wall and corner fillet in a single pass
▸Reduces fillet machining time vs interpolated ball-nose strategy
▸Suitable for oil & gas, aerospace, and heavy equipment components

Radius Selection Tip: R2.5mm requires careful feeds and speeds management — the curved cutting edge geometry changes effective rake angle significantly across the arc. In HRC65 steel, use conservative feed (60–70% of square end mill equivalent) until material behaviour is confirmed.

ø6mm Applications

6mm 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: ø6mm 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 ø6mm Diameter, Other Radii