4-Flute · TiSiN · R0.3mm · HRC55 · Standard Reach

6mm 4-Flute R0.3mm TiSiN Solid Carbide Corner Radius End Millfor HRC55 Steel & Stainless

TiSiN-coated 4-flute corner radius end mills combine the rigidity of a square end mill with corner geometry that reduces stress concentration and micro-chipping on hardened surfaces up to HRC55. The corner radius distributes cutting load across a wider arc at entry, dramatically extending tool life versus sharp-corner tools in steel and stainless steel shoulder milling and semi-finish passes. TiSiN hardness > 3,500 HV resists abrasion at continuous contact conditions.

R0.3mmD1 6mmL2 15mmD2 6mmOAL 50mm4 FlutesTiSiNHRC55Standard ReachMOQ 1 pc

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Reference price

$16.27

Ref. factory price (USD)

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

TiSiN · 4 Flute · HRC55

6mm 4F R0.3mm TiSiN

L2 15mm · D2 6mm · OAL 50mm

Standard Reach · HRC55

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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 Radius0.3 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 Flutes4
End GeometryCorner Radius (Bull Nose)
CoatingTiSiN Titanium Silicon Nitride
Max Material HardnessHRC55
Reach CategoryStandard (L1/D1 = 8.3×)
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

TiSiN · 4 Flute · HRC55 · R0.3mm

6mm 4-flute R0.3mm TiSiN corner radius end mill — L2=15mm OAL=50mm
Corner R
0.3mm
D1 h7
6mm
L2
15mm
D2 h6
6mm
L1
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 HRC55 steel, this radius absorbs chip impact without generating visible corner burrs. Verify pocket design tolerance before specifying — most CAD models default to R0.5mm.

ø6mm Applications

6mm TiSiN — 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 HRC55 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

TiSiN on Corner Radius Geometry

  • ▸TiSiN hardness > 3,500 HV on curved corner arc geometry
  • ▸Prevents micro-chipping at re-entry in interrupted shoulder milling
  • ▸Low friction for reduced built-up edge in stainless steel shoulder cuts
  • ▸Dry, MQL, or flood coolant — all environments supported
ISO PISO MISO KTiSiN corner radius end mill4 flute bull nose end mill HRC55corner radius carbide end mill steelradius end mill semi-finish milling

Same ø6mm Diameter, Other Radii

TiSiN · 4 Flute · HRC55 — Other Corner Radii at ø6mm

R0.2mm
L2 15mm
R0.5mm
L2 15mm
R1mm
L2 15mm
R1.5mm
L2 15mm
R2mm
L2 15mm
R2.5mm
L2 15mm

Same Dimensions, Other Coatings

ø6mm R0.3mm / L2 15mm — Other Variants

nACo · 4 Flute · HRC65
nACo · 4 Flute · HRC65
HRC65 · 4F · R0.3mm
Uncoated · 4 Flute · Aluminium
Uncoated · 4 Flute · Aluminium
Non-Ferrous · 4F · R0.3mm
ø4mm R0.3mm / L2 8mm← All Corner Radius End Millsø8mm R0.3mm / L2 20mm

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