4-Flute · TiSiN · R1.5mm · HRC55 · Standard Reach

12mm 4-Flute R1.5mm 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.

R1.5mmD1 12mmL2 30mmD2 12mmOAL 75mm4 FlutesTiSiNHRC55Standard ReachMOQ 1 pc

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Reference price

$91.59

Ref. factory price (USD)

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

TiSiN · 4 Flute · HRC55

12mm 4F R1.5mm TiSiN

L2 30mm · D2 12mm · OAL 75mm

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 Radius1.5 mm
Cutter Diameter (D1 h7)12 mm
Flute Length (L2)30 mm
Shank Diameter (D2 h6)12 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 = 6.3×)
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 · R1.5mm

12mm 4-flute R1.5mm TiSiN corner radius end mill — L2=30mm OAL=75mm
Corner R
1.5mm
D1 h7
12mm
L2
30mm
D2 h6
12mm
L1
75mm
Reach
Standard

R1.5mm Corner Geometry

Large fillet for structural and automotive components requiring R1.5 corners

  • ▸Single-pass production of R1.5mm fillet features
  • ▸Eliminates interpolation entry required for ball-nose on same radius
  • ▸Lower vibration tendency vs ball nose on shallow 3D surfaces
  • ▸Preferred for automotive and aerospace structural pocket corners
Radius Selection Tip: R1.5mm corner radius end mills excel where a ball nose would need to interpolate along the corner arc at reduced feed. Here, the corner radius matches the required fillet exactly — one pass, precise radius, no interpolation error. Ideal for automotive die corner features.

ø12mm Applications

12mm TiSiN — Where This Tool Fits

  • ▸Large mould and die shoulder milling
  • ▸Structural bracket and frame pocketing
  • ▸Transmission case features
  • ▸Wind turbine blade mould profiling
Machining Tip: ø12mm in HRC55 steel: use 0.5×D DOC for first passes to verify fixturing, then increase to 1×D for production. Corner radius is especially beneficial at this size where vibration-induced corner micro-chipping is common in hardened steel.

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 ø12mm Diameter, Other Radii

TiSiN · 4 Flute · HRC55 — Other Corner Radii at ø12mm

R0.2mm
L2 30mm
R0.3mm
L2 30mm
R0.5mm
L2 30mm
R1mm
L2 30mm
R2mm
L2 30mm
R2.5mm
L2 30mm

Same Dimensions, Other Coatings

ø12mm R1.5mm / L2 30mm — Other Variants

nACo · 4 Flute · HRC65
nACo · 4 Flute · HRC65
HRC65 · 4F · R1.5mm
Uncoated · 4 Flute · Aluminium
Uncoated · 4 Flute · Aluminium
Non-Ferrous · 4F · R1.5mm
ø10mm R1.5mm / L2 25mm← All Corner Radius End Millsø6mm R2mm / L2 15mm

Order 12mm R1.5mm 4-Flute TiSiN Today

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