4-Flute · TiSiN · R0.2mm · HRC55 · Standard Reach

2.5mm 4-Flute R0.2mm 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.

R0.2mmD1 2.5mmL2 7mmD2 4mmOAL 50mm4 FlutesTiSiNHRC55Standard ReachMOQ 1 pc

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Reference price

$7.69

Ref. factory price (USD)

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

TiSiN · 4 Flute · HRC55

2.5mm 4F R0.2mm TiSiN

L2 7mm · 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 Radius0.2 mm
Cutter Diameter (D1 h7)2.5 mm
Flute Length (L2)7 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 = 20.0×)
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 · R0.2mm

2.5mm 4-flute R0.2mm TiSiN corner radius end mill — L2=7mm OAL=50mm
Corner R
0.2mm
D1 h7
2.5mm
L2
7mm
D2 h6
4mm
L1
50mm
Reach
Standard

R0.2mm Corner Geometry

Micro edge protection — minimal corner rounding for near-sharp corner features

  • ▸Virtually sharp corner appearance while eliminating micro-chipping
  • ▸Ideal where fillet radius tolerance is ± 0.05mm
  • ▸Extends tool life vs true sharp-corner tools by 30–50%
  • ▸Suitable for precision mould parting surfaces and embossed lettering
Radius Selection Tip: R0.2mm is the tightest corner radius standard. In HRC55 steel, the R0.2mm arc is small enough to appear visually sharp but prevents the notching failure that destroys zero-radius tools. Use identical step-over and depth parameters as you would for a square end mill.

ø2.5mm Applications

2.5mm TiSiN — Where This Tool Fits

  • ▸Precision instrument and watch component features
  • ▸Medical device micro-pocket machining
  • ▸Die insert fine detail features
  • ▸Electronic connector pocket profiling
Machining Tip: ø2.5mm corner radius end mills need ≤ 0.003mm spindle runout. In HRC55 steel, use 0.01–0.04 mm/tooth chip load; the corner radius geometry reduces tool tip stress allowing slightly higher chip load than equivalent sharp-corner tools.

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 ø2.5mm Diameter, Other Radii

TiSiN · 4 Flute · HRC55 — Other Corner Radii at ø2.5mm

R0.3mm
L2 7mm
R0.5mm
L2 7mm

Same Dimensions, Other Coatings

ø2.5mm R0.2mm / L2 7mm — Other Variants

nACo · 4 Flute · HRC65
nACo · 4 Flute · HRC65
HRC65 · 4F · R0.2mm
Uncoated · 4 Flute · Aluminium
Uncoated · 4 Flute · Aluminium
Non-Ferrous · 4F · R0.2mm
ø2mm R0.2mm / L2 6mm← All Corner Radius End Millsø3mm R0.2mm / L2 8mm

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