4-Flute · TiSiN · R0.5mm · HRC55 · Standard Reach

4mm 4-Flute R0.5mm 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.

R0.5mmD1 4mmL2 15mmD2 4mmOAL 75mm4 FlutesTiSiNHRC55Standard ReachMOQ 1 pc

Get Pricing & Stock

Reference price

$11.64

Ref. factory price (USD)

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

TiSiN · 4 Flute · HRC55

4mm 4F R0.5mm TiSiN

L2 15mm · D2 4mm · OAL 75mm

Standard Reach · HRC55

WhatsApp Quote Email RFQUse contact form →

✓ Factory direct pricing

✓ MOQ 1 piece, ships 1–5 days

✓ Custom radius in 0.1mm increments

Full Dimensions

Technical Specifications

Corner Radius0.5 mm
Cutter Diameter (D1 h7)4 mm
Flute Length (L2)15 mm
Shank Diameter (D2 h6)4 mm
Overall Length (L1)75 mm
Number of Flutes4
End GeometryCorner Radius (Bull Nose)
CoatingTiSiN Titanium Silicon Nitride
Max Material HardnessHRC55
Reach CategoryStandard (L1/D1 = 18.8×)
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 · R0.5mm

4mm 4-flute R0.5mm TiSiN corner radius end mill — L2=15mm OAL=75mm
Corner R
0.5mm
D1 h7
4mm
L2
15mm
D2 h6
4mm
L1
75mm
Reach
Standard

R0.5mm Corner Geometry

Industry standard fillet — most common CNC pocket and shoulder radius

  • ▸Longest tool life in class for shoulder milling and pocketing
  • ▸Matches ISO standard pocket corner specification R0.5mm
  • ▸Reduces cutting forces by ~20% vs sharp corner in hardened steel
  • ▸Available in full standard size range including long-reach variants
Radius Selection Tip: R0.5mm is the most universal specification. In HRC55 steel, it provides the best balance of fillet feature accuracy, tool life, and chatter resistance. Recommended for all new mould base and structural component programmes unless design specifically requires R < 0.5mm.

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 Diameter & Radius, Different Reach

ø4mm R0.5mm TiSiN · 4 Flute · HRC55 — Other Flute Lengths

L2 11mm
OAL 50mm · Standard
L2 20mm
OAL 100mm · Standard

Same ø4mm Diameter, Other Radii

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

R0.2mm
L2 11mm
R0.3mm
L2 8mm
R1mm
L2 11mm

Same Dimensions, Other Coatings

ø4mm R0.5mm / L2 15mm — Other Variants

nACo · 4 Flute · HRC65
nACo · 4 Flute · HRC65
HRC65 · 4F · R0.5mm
Uncoated · 4 Flute · Aluminium
Uncoated · 4 Flute · Aluminium
Non-Ferrous · 4F · R0.5mm
ø4mm R0.5mm / L2 11mm← All Corner Radius End Millsø4mm R0.5mm / L2 20mm

Order 4mm R0.5mm 4-Flute TiSiN Today

Factory direct. MOQ 1 piece. Pricing confirmed within 4 hours.

WhatsApp NowContact Form