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

8mm 4-Flute R0.5mm TiSiN Solid Carbide Corner Radius End Millfor HRC55 Steel & Stainless

Name: 8mm 4-Flute R0.5mm TiSiN Corner Radius End Mill for HRC55
Brand: Solid Carbide Direct
SKU: SCD-CREM-TISIN-4F-D8-R05-L50
Price: 84.06 USD
Availability: InStock

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 8mmL2 50mmD2 8mmOAL 150mm4 FlutesTiSiNHRC55Standard ReachMOQ 1 pc

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Reference price

$84.06

Ref. factory price (USD)

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

8mm 4F R0.5mm TiSiN

L2 50mm · D2 8mm · OAL 150mm

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 Radius	0.5 mm
Cutter Diameter (D1 h7)	8 mm
Flute Length (L2)	50 mm
Shank Diameter (D2 h6)	8 mm
Overall Length (L1)	150 mm
Number of Flutes	4
End Geometry	Corner Radius (Bull Nose)
Coating	TiSiN Titanium Silicon Nitride
Max Material Hardness	HRC55
Reach Category	Standard (L1/D1 = 18.8×)
Helix Angle	30°–35°
Substrate	K10/K20 Ultra-Fine Grain Carbide
Shank Tolerance	h6
MOQ	1 piece
Lead Time (standard)	1–5 business days
Lead Time (custom)	5–15 business days

TiSiN · 4 Flute · HRC55 · R0.5mm

Corner R

0.5mm

D1 h7

8mm

50mm

D2 h6

8mm

150mm

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.

ø8mm Applications

8mm TiSiN — Where This Tool Fits

▸Automotive component shoulder milling
▸Pump body and valve pocket features
▸Gearbox cover profiling
▸Large mould runner channel machining

Machining Tip: ø8mm is the production sweet spot for corner radius end mills. In HRC55 steel, radial engagement can be 30–50% of D for profiling, with DOC up to 1×D for semi-finish passes. The corner radius reduces chatter significantly at this diameter.

Coating Performance