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End Mill for Hardened Steel 2 Flute Long Neck Corner Radius End Mill

SAMHO 2-Flute Long-Neck Corner Radius End Mill — Precision Tool for Hardened Steel Machining

Say goodbye to production losses caused by premature tool wear. The SAMHO 2-flute long neck corner radius end mill is engineered for high-precision CNC machining of hardened steels and high-hardness alloys. With cutting-edge high-adhesion coating technology, this tool delivers extended service life and enables consistent, efficient cutting.

Applicable Materials: Optimized for hardened steels and various high-hardness alloys.

Ultimate Durability: Constructed with a high-strength, micro-grain cemented carbide matrix, precision-ground, and coated with a high-adhesion layer. This combination reduces blade chipping, ensuring stable, long-lasting performance.

High-Precision Machining: The optimized corner-radius geometry minimizes chipping and enhances cutting stability. Ideal for machining complex mold cavities, internal corner transitions, and high-precision contours.

Trusted by CNC Professionals: Designed to deliver reliable, repeatable, and high-precision results on high-hardness materials.

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In the field of high-hardness steel machining, tools must meet exceptionally rigorous standards. They require not only precise cutting but also superior wear resistance and long-lasting durability. SAMHO’s 2-flute long-neck corner-radius end mills (D0.2R0.05–D0.8R0.1 mm) feature a specialized coating and are engineered specifically to meet these demanding requirements. Designed for CNC operators, these end mills allow efficient machining of hardened steels and high-hardness alloys. Their advanced wear-resistant coating and precise geometry enhance cutting stability and extend tool life, ensuring efficient and accurate machining every time.

Advanced Technical Features

High-Adhesion Coating for Ultra-Long Tool Life
Our proprietary wear-resistant coating provides exceptional hardness and chemical inertness.

  • Wear Resistance: The cutting edge stays sharp during prolonged, continuous machining of hardened steel.
  • Micro-Chipping Prevention: The coating firmly adheres to the carbide substrate under high-speed cutting conditions, significantly reducing edge chipping.

Corner Radius Geometry Optimized for Hardened Steel
The precision-engineered corner radius ensures excellent performance when machining hardened steel and high-hardness alloys.

  • High-Precision Cutting: Ideal for complex mold cavities, internal corner transitions, and intricate contours.
  • Superior Surface Finish: Produces smooth, crack-free surfaces on hardened steel components.

High-Efficiency Dual-Flute “Cold Cutting” Design
The sharp dual-flute geometry minimizes cutting heat and improves chip evacuation for reliable CNC operation.

  • Maximized Chip Evacuation: Quickly clears chips from the cutting zone, preventing tool jamming.
  • Reduced Cutting Load: Limits heat buildup, avoiding thermal cracking in brittle steel materials.

Ultra-Fine Grain Carbide Substrate with Precision Grinding
High-strength, ultra-fine grain carbide combined with precision grinding ensures stability and accuracy in hardened steel machining.

  • Strict Dimensional Tolerances: Maintained within ±0.01 mm, ensuring consistent results across batch production.
  • High Fracture Resistance: Enhances durability, making it ideal for highly abrasive, high-hardness steel machining.

Target Applications & Industries

This series of 2-flute long neck corner radius end mills is widely used in CNC machining of hardened steels and high-hardness alloys.

  • Machining Hardened Steel and High-Hardness Alloys: Ideal for cutting complex contours and precision mold cavities with consistent accuracy.
  • Internal Corner Transition Zones: The corner-radius design minimizes edge chipping and extends tool life, ensuring reliable performance.
  • High-Precision Structural Machining: Enables accurate cutting of workpieces with intricate geometries.
  • Batch Production of Consistent Parts: Maintains superior surface finish and dimensional stability, making it trusted by CNC professionals.

Why Choose SAMHO as Your Wholesale Partner?

OEM/ODM Support: Fully customizable to meet client-specific requirements and diverse CNC machining applications.

Ultra-High Shank Diameter Precision: Tolerance controlled within 0–0.003 mm for exceptional tool mounting stability.

Optimized for Hardened Steel Machining: Corner-radius geometry reduces chipping and extends tool lifespan.

Precision Manufacturing & Advanced Coating: Enhances wear resistance, cutting stability, and consistent performance.

Ideal for Complex Workpieces: Enables precise machining of mold cavities, internal corner transitions, and high-precision contours.

Trusted by CNC Professionals: Designed to deliver reliable, high-precision results on high-hardness steels and alloys.

Recommended Materials for Machining (Highly Recommended: ⭐️ | Recommended: ⭕️ | Suggested: ◯)

Category Work Material Grade
DIE STEEL Carbon steels (S45C/S55C)
Alloy steels (SK/SCM/SUS)
Prehardened steels (NAK/HPM)
Hardened steels (~55/~60/~70HRC) ⭐️
SPECIAL MATERIAL Aluminum alloys
Graphite
Copper
Plastics
Carbon fiber
Titanium alloys
Heat resistant alloys
Cemented carbide
Hard brittle (non-metallic) material

long neck corner radius end mill

Total 41 models

Model Number Outside Diameter Radius Length Of Cut Effective Length Shank Taper Angle Overall Length Number Of Flutes Shank Diameter In Stock
SHHLSR2-002005005 D0.2 R0.05 0.2 0.5 12° 50 2 4 ○
SHHLSR2-002005010 D0.2 R0.05 0.2 1 12° 50 2 4 ○
SHHLSR2-002005015 D0.2 R0.05 0.2 1.5 12° 50 2 4 ○
SHHLSR2-002005020 D0.2 R0.05 0.2 2 12° 50 2 4 ○
SHHLSR2-003005005 D0.3 R0.05 0.3 0.5 12° 50 2 4 ○
SHHLSR2-003005010 D0.3 R0.05 0.3 1 12° 50 2 4 ○
SHHLSR2-003005015 D0.3 R0.05 0.3 1.5 12° 50 2 4 ○
SHHLSR2-003005020 D0.3 R0.05 0.3 2 12° 50 2 4 ○
SHHLSR2-003005030 D0.3 R0.05 0.3 3 12° 50 2 4 ○
SHHLSR2-004005010 D0.4 R0.05 0.4 1 12° 50 2 4 ○
SHHLSR2-004005020 D0.4 R0.05 0.4 2 12° 50 2 4 ○
SHHLSR2-004005030 D0.4 R0.05 0.4 3 12° 50 2 4 ○
SHHLSR2-004005040 D0.4 R0.05 0.4 4 12° 50 2 4 ○
SHHLSR2-00401010 D0.4 R0.1 0.4 1 12° 50 2 4 ○
SHHLSR2-00401020 D0.4 R0.1 0.4 2 12° 50 2 4 ○
SHHLSR2-00401030 D0.4 R0.1 0.4 3 12° 50 2 4 ○
SHHLSR2-00401040 D0.4 R0.1 0.4 4 12° 50 2 4 ○
SHHLSR2-005005010 D0.5 R0.05 0.5 1 12° 50 2 4 ○
SHHLSR2-005005020 D0.5 R0.05 0.5 2 12° 50 2 4 ○
SHHLSR2-005005040 D0.5 R0.05 0.5 4 12° 50 2 4 ○
SHHLSR2-005005060 D0.5 R0.05 0.5 6 12° 50 2 4 ○
SHHLSR2-00501010 D0.5 R0.1 0.5 1 12° 50 2 4 ○
SHHLSR2-00501020 D0.5 R0.1 0.5 2 12° 50 2 4 ○
SHHLSR2-00501040 D0.5 R0.1 0.5 4 12° 50 2 4 ○
SHHLSR2-00501060 D0.5 R0.1 0.5 6 12° 50 2 4 ○
SHHLSR2-006005020 D0.6 R0.05 0.6 2 12° 50 2 4 ○
SHHLSR2-006005040 D0.6 R0.05 0.6 4 12° 50 2 4 ○
SHHLSR2-006005060 D0.6 R0.05 0.6 6 12° 50 2 4 ○
SHHLSR2-006005080 D0.6 R0.05 0.6 8 12° 50 2 4 ○
SHHLSR2-00601020 D0.6 R0.1 0.6 2 12° 50 2 4 ○
SHHLSR2-00601040 D0.6 R0.1 0.6 4 12° 50 2 4 ○
SHHLSR2-00601060 D0.6 R0.1 0.6 6 12° 50 2 4 ○
SHHLSR2-00601080 D0.6 R0.1 0.6 8 12° 50 2 4 ○
SHHLSR2-008005020 D0.8 R0.05 0.8 2 12° 50 2 4 ○
SHHLSR2-008005040 D0.8 R0.05 0.8 4 12° 50 2 4 ○
SHHLSR2-008005060 D0.8 R0.05 0.8 6 12° 50 2 4 ○
SHHLSR2-008005080 D0.8 R0.05 0.8 8 12° 50 2 4 ○
SHHLSR2-00801020 D0.8 R0.1 0.8 2 12° 50 2 4 ○
SHHLSR2-00801040 D0.8 R0.1 0.8 4 12° 50 2 4 ○
SHHLSR2-00801060 D0.8 R0.1 0.8 6 12° 50 2 4 ○
SHHLSR2-00801080 D0.8 R0.1 0.8 8 12° 50 2 4 ○

Contour Milling Parameters

Work Material HRC48-55 hardened steel HRC56-62 hardened steel HRC63-70 hardened steel
Diameter Radius Effective Length (mm) (min-1) Speed (mm/min) Feed (mm) Axial depth (mm) Radidl depth (min-1) Speed (mm/min) Feed (mm) Axial depth (mm) Radidl depth (min-1) Speed (mm/min) Feed (mm) Axial depth
(mm) Radidl depth
D0.2 R0.05 0.5 30000 400 0.003 0.04 30000 320 0.003 0.02 30000 240 0.003 0.01
D0.2 R0.05 1 30000 300 0.003 0.04 30000 240 0.002 0.02 30000 160 0.002 0.01
D0.2 R0.05 1.5 30000 200 0.002 0.04 30000 160 0.002 0.02 30000 120 0.001 0.01
D0.2 R0.05 2 30000 100 0.002 0.04 30000 80 0.001 0.02 30000 60 0.001 0.01
D0.3 R0.05 0.5 30000 680 0.003 0.08 30000 560 0.003 0.04 30000 450 0.003 0.03
D0.3 R0.05 1 30000 600 0.003 0.08 30000 500 0.003 0.04 30000 400 0.003 0.03
D0.3 R0.05 1.5 30000 400 0.003 0.08 30000 320 0.003 0.04 30000 240 0.003 0.03
D0.3 R0.05 2 30000 300 0.003 0.08 30000 240 0.003 0.04 25000 200 0.003 0.03
D0.3 R0.05 3 25000 100 0.002 0.08 25000 80 0.002 0.04 20000 60 0.002 0.03
D0.4 R0.05 1 30000 800 0.005 0.1 28000 700 0.005 0.05 25000 600 0.005 0.04
D0.4 R0.05 2 30000 600 0.005 0.1 25000 500 0.005 0.05 25000 400 0.005 0.04
D0.4 R0.05 3 25000 500 0.004 0.1 23000 440 0.003 0.05 18000 320 0.003 0.04
D0.4 R0.05 4 25000 400 0.003 0.1 20000 320 0.002 0.05 18000 240 0.002 0.04
D0.4 R0.1 1 30000 800 0.005 0.1 28000 700 0.005 0.05 25000 600 0.005 0.04
D0.4 R0.1 2 30000 600 0.005 0.1 25000 500 0.005 0.05 25000 400 0.005 0.04
D0.4 R0.1 3 25000 500 0.004 0.1 23000 400 0.003 0.05 18000 320 0.003 0.04
D0.4 R0.1 4 25000 400 0.003 0.1 20000 320 0.002 0.05 18000 240 0.002 0.04
D0.5 R0.05 1 25000 1000 0.01 0.15 23000 900 0.007 0.1 20000 800 0.005 0.08
D0.5 R0.05 2 25000 840 0.01 0.15 23000 720 0.007 0.1 20000 600 0.005 0.08
D0.5 R0.05 4 25000 600 0.005 0.15 23000 480 0.003 0.1 20000 360 0.002 0.08
D0.5 R0.05 6 20000 320 0.003 0.15 18000 200 0.002 0.1 16000 140 0.001 0.08
D0.5 R0.1 1 25000 1000 0.01 0.15 23000 900 0.007 0.1 20000 800 0.005 0.08
D0.5 R0.1 2 25000 840 0.01 0.15 23000 720 0.007 0.1 20000 600 0.005 0.08
D0.5 R0.1 4 25000 600 0.005 0.15 23000 480 0.003 0.1 20000 360 0.002 0.08
D0.5 R0.1 6 20000 320 0.003 0.15 18000 200 0.002 0.1 16000 140 0.001 0.08
D0.6 R0.05 2 25000 1000 0.02 0.2 23000 800 0.01 0.15 20000 640 0.007 0.1
D0.6 R0.05 4 23000 800 0.015 0.2 20000 600 0.007 0.15 18000 400 0.005 0.1
D0.6 R0.05 6 20000 400 0.008 0.2 18000 300 0.005 0.15 12000 200 0.003 0.1
D0.6 R0.05 8 16000 300 0.005 0.2 14000 200 0.002 0.15 10000 160 0.001 0.1
D0.6 R0.1 2 25000 1000 0.02 0.2 23000 800 0.01 0.15 20000 640 0.007 0.1
D0.6 R0.1 4 23000 800 0.015 0.2 20000 600 0.007 0.15 18000 400 0.005 0.1
D0.6 R0.1 6 20000 400 0.008 0.2 18000 300 0.005 0.15 12000 200 0.003 0.1
D0.6 R0.1 8 16000 300 0.005 0.2 14000 200 0.002 0.15 10000 160 0.001 0.1
D0.8 R0.05 2 25000 1600 0.03 0.25 23000 1400 0.02 0.16 20000 1000 0.015 0.14
D0.8 R0.05 4 25000 1400 0.025 0.25 23000 1200 0.015 0.16 20000 800 0.01 0.14
D0.8 R0.05 6 20000 1100 0.02 0.25 18000 900 0.01 0.16 16000 650 0.007 0.14
D0.8 R0.05 8 16000 800 0.01 0.25 14000 600 0.005 0.16 12000 400 0.005 0.14
D0.8 R0.1 2 25000 1600 0.03 0.25 23000 1400 0.02 0.16 20000 1000 0.015 0.14
D0.8 R0.1 4 25000 1400 0.025 0.25 23000 1200 0.015 0.16 20000 800 0.01 0.14
D0.8 R0.1 6 20000 1100 0.02 0.25 18000 900 0.01 0.16 16000 650 0.007 0.14
D0.8 R0.1 8 16000 800 0.01 0.25 14000 600 0.005 0.16 12000 400 0.005 0.14

Milling Amount for Side Milling(mm)

Work Material \ Length of Cut 2.5D (Length of Cut=Diameter*2.5) 4D (Length of Cut=Diameter*4)
45HRC以下Below 45HRC ae​=0.07Dap​=2D ae​=0.07Dap​=2D
45HRC以上Above 45HRC ae​=0.03Dap​=1.5D ae​=0.03Dap​=1.5D

D: Diameter (mm)

ap:AxialDepth (mm)

ae: Radial Depth (mm)

Note:

*Decrease both spindle speed and feed rate proportionally when the milling parameters exceed the machine’s maximum spindle speed;

*Recommend oil coolant for Stainless Steels and Heat Resistance Alloys;

*Recommend using a non-contact measuring device to avoid damaging the precisiontip point;

*Decrease both spindle speed and feed rate proportionally in case of chattering;

*When the material hardness is greater than HRC58 degrees, it is recommended to use air blow cooling for roughing andoil mistor air blow cooling for finishing.

Download 1: End Mill for Hardened Steel 2 Flute Long Neck Corner Radius End Mill File
Download 2: End Mill for Hardened Steel 2 Flute Long Neck Corner Radius End Mill File

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