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

4mm 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 4mmL2 8mmD2 4mmOAL 50mm4 FlutesTiSiNHRC55Standard ReachMOQ 1 pc

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Cena referencyjna

32,19 zł

Cena ref. fabryki (PLN)

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

TiSiN · 4 Flute · HRC55

4mm 4F R0.3mm TiSiN

L2 8mm · D2 4mm · 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)4 mm
Flute Length (L2)8 mm
Shank Diameter (D2 h6)4 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 = 12.5×)
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

4mm 4-flute R0.3mm TiSiN corner radius end mill — L2=8mm OAL=50mm
Corner R
0.3mm
D1 h7
4mm
L2
8mm
D2 h6
4mm
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.

ø4mm Applications

4mm 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: ø4mm 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 ø4mm Diameter, Other Radii

TiSiN · 4 Flute · HRC55 — Other Corner Radii at ø4mm

R0.2mm
L2 11mm
R0.5mm
L2 11mm
R1mm
L2 11mm

Same Dimensions, Other Coatings

ø4mm R0.3mm / L2 8mm — 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
ø3mm R0.3mm / L2 8mm← All Corner Radius End Millsø6mm R0.3mm / L2 15mm

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