4-Flute · TiSiN · R1mm · HRC55 · Standard Reach

3mm 4-Flute R1mm TiSiN Solid Carbide Corner Radius End Millfor HRC55 Steel & Stainless

Name: 3mm 4-Flute R1mm TiSiN Corner Radius End Mill for HRC55
Brand: Solid Carbide Direct
SKU: SCD-CREM-TISIN-4F-D3-R1-L8
Price: 5.55 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.

R1mmD1 3mmL2 8mmD2 3mmOAL 50mm4 FlutesTiSiNHRC55Standard ReachMOQ 1 pc

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Reference price

$5.55

Ref. factory price (USD)

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

3mm 4F R1mm TiSiN

L2 8mm · D2 3mm · 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 Radius	1 mm
Cutter Diameter (D1 h7)	3 mm
Flute Length (L2)	8 mm
Shank Diameter (D2 h6)	3 mm
Overall Length (L1)	50 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 = 16.7×)
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 · R1mm

Corner R

1mm

D1 h7

3mm

8mm

D2 h6

3mm

50mm

Reach

Standard

R1mm Corner Geometry

General-purpose fillet milling — strongest corner geometry for heavy passes

▸Maximum radial support on cutting edge during heavy DOC passes
▸Ideal for semi-finish passes before a smaller-radius finishing pass
▸Produces clean R1mm fillets in one pass — no secondary operation
▸Recommended for die cast tooling, injection mould cores, and structural pockets

Radius Selection Tip: R1mm provides the highest edge strength of commonly used radii. In HRC55 steel, DOC can be increased 20–30% over R0.5mm without chatter. Use for semi-finish passes that must leave a consistent stock allowance before a ball-nose finish.

ø3mm Applications

3mm 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: ø3mm 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

Note: This diameter/radius/flute-length combination is available in 2 shank configurations:D2=3mm (OAL=50mm)D2=4mm (OAL=50mm). Specify shank diameter when ordering.

Same Diameter & Radius, Different Reach