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End Mill for Hardened Steel 4 Flute Long Neck Flat End Mill

SAMHO 4-Flute Long-Neck Flat-End Mill — The Ultimate Tool for Precision CNC Machining of Hardened Steel

Stop letting high-hardness materials reduce your machining efficiency. The SAMHO 4 flute long neck flat end mill is specifically engineered for precision CNC milling of hardened steel and high hardness alloys. It enables CNC operators to machine efficiently and consistently. Thanks to cutting-edge high-adhesion coating technology, validated through extensive real-world applications, this tool delivers significantly extended tool life and withstands prolonged, continuous machining cycles.

Applicable Materials: Optimized for hardened steel and high-hardness steel workpieces.

Exceptional Durability: Features an advanced grinding process and a chemically inert coating to ensure the tool remains sharp and stable under high temperature and heavy load conditions.

Machining Advantages:

  • High-efficiency cutting: Minimizes heat buildup during machining.
  • Precision cutting-edge geometry: Ensures accurate and consistent dimensions.
  • Long-neck design: Ideal for deep cavities and complex structural features.
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In the field of hardened steel machining, tool performance requirements are extremely demanding. Cutting tools must offer superior wear resistance, exceptional stability, and precise, efficient machining. SAMHO’s 4-flute long-neck flat end mill (D1-D3 mm), with a specialized coating, is engineered to meet these challenges. It is optimized for CNC operators, enabling precise and efficient machining of hardened steel while extending tool life and boosting productivity.

Advanced Technical Features

High-Adhesion Coating for Exceptional Tool Life
Our proprietary high-performance coating gives these tools extreme hardness and chemical inertness.

  • Wear Resistance: Maintains a sharp cutting edge during continuous high-temperature machining of hardened steel.
  • Micro-Chipping Prevention: Keeps the coating firmly bonded to the carbide substrate even in high-speed cutting conditions.

Cutting-Edge Geometry Designed for Precision Machining of Hardened Steel

  • 4-Flute Long Neck Design: Ideal for precision CNC milling of deep cavities and high-hardness hardened steel workpieces.
  • Optimized Tip and Neck Geometry: Reduces cutting load, minimizes heat buildup, and improves machining stability.

Efficient Cutting and Chip Evacuation

  • Optimized Multi-Flute Geometry: Enhances chip evacuation, quickly clearing chips from the cutting zone.
  • Reduced Cutting Heat: Minimizes the heat-affected zone, preventing cracking or deformation in hardened steel.

Ultra-Fine Grain Carbide Substrate and Precision Grinding

  • Dimensional Accuracy: Strictly controlled within ±0.01 mm for consistent batch production.
  • Exceptional Fracture Resistance: Significantly improves tool durability, especially for high-hardness, highly abrasive hardened steels.

Target Applications & Industries

This series of 4-flute long-neck flat end mills is specifically designed for precision CNC milling of hardened steel. It is highly versatile and widely applicable to:

  • Precision milling of deep cavities in high-hardness hardened steel workpieces.
  • Machining of mold cavities and complex structures with consistent accuracy.
  • High-precision contour and internal angle transition machining, ideal for intricate designs.
  • Batch production of workpieces that require exceptional wear resistance and dimensional precision.

Why Choose SAMHO as Your Wholesale Partner?

Custom OEM/ODM Solutions: Tailored to meet diverse client requirements.

Precisely Controlled Shank Diameter: Tolerances of 0–0.003 mm ensure stable and secure tool mounting.

Premium Materials and Coatings: Deliver exceptional wear resistance and extended tool life.

Engineered for Precision CNC Machining of Hardened Steel: High efficiency, low cutting heat, and consistently reliable precision.

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

2 flute flat long neck end mill

Total 26 models

Model Number Outside Diameter Length Of Cut Effective Length Shank Taper Angle Overall Length Number Of Flutes Shank Diameter In Stock
SHHLS4-010040 1 1.5 4 12° 50 4 4 ○
SHHLS4-010060 1 1.5 6 12° 50 4 4 ○
SHHLS4-010080 1 1.5 8 12° 50 4 4 ○
SHHLS4-010100 1 1.5 10 12° 50 4 4 ○
SHHLS4-010160 1 1.5 16 12° 50 4 4 ○
SHHLS4-015040 1.5 2.3 4 12° 50 4 4 ○
SHHLS4-015060 1.5 2.3 6 12° 50 4 4 ○
SHHLS4-015080 1.5 2.3 8 12° 50 4 4 ○
SHHLS4-015100 1.5 2.3 10 12° 50 4 4 ○
SHHLS4-015160 1.5 2.3 16 12° 50 4 4 ○
SHHLS4-020060 2 3 6 12° 50 4 4 ○
SHHLS4-020080 2 3 8 12° 50 4 4 ○
SHHLS4-020100 2 3 10 12° 50 4 4 ○
SHHLS4-020120 2 3 12 12° 50 4 4 ○
SHHLS4-020160 2 3 16 12° 50 4 4 ○
SHHLS4-020200 2 3 20 12° 50 4 4 ○
SHHLS4-030080 3 4.5 8 12° 50 4 4 ○
SHHLS4-030100 3 4.5 10 12° 50 4 4 ○
SHHLS4-030120 3 4.5 12 12° 50 4 4 ○
SHHLS4-030160 3 4.5 16 12° 50 4 4 ○
SHHLS4-030200 3 4.5 20 12° 50 4 4 ○
SHHLS4-030080-6 3 4.5 8 12° 50 4 6 ○
SHHLS4-030100-6 3 4.5 10 12° 50 4 6 ○
SHHLS4-030120-6 3 4.5 12 12° 50 4 6 ○
SHHLS4-030160-6 3 4.5 16 12° 50 4 6 ○
SHHLS4-030200-6 3 4.5 20 12° 50 4 6 ○

Contour Milling Parameters

Work Material HRC48-55 hardened steel HRC56-62 hardened steel HRC63-70 hardened steel
Diameter 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
1 4 23000 900 0.04 0.5 18000 800 0.03 0.4 14000 500 0.02 0.3
1 6 18000 700 0.02 0.5 14000 600 0.01 0.4 10000 400 0.007 0.3
1 8 16000 600 0.02 0.5 12000 500 0.01 0.4 8000 340 0.005 0.3
1 10 14000 500 0.01 0.5 10000 400 0.007 0.4 6000 250 0.005 0.3
1 16 12000 320 0.006 0.5 9000 250 0.004 0.4 5500 150 0.003 0.3
1.5 4 20000 900 0.05 0.75 18000 800 0.04 0.6 4000 600 0.03 0.45
1.5 6 20000 800 0.04 0.75 18000 700 0.03 0.6 14000 500 0.02 0.45
1.5 8 18000 600 0.03 0.75 14000 600 0.03 0.6 10000 380 0.01 0.45
1.5 10 16000 500 0.03 0.75 14000 500 0.02 0.6 10000 350 0.01 0.45
1.5 16 10000 360 0.01 0.75 9000 300 0.007 0.6 6800 200 0.005 0.45
2 6 18000 900 0.06 1 15000 750 0.05 0.8 12000 600 0.03 0.6
2 8 16000 800 0.05 1 12000 600 0.04 0.8 9500 500 0.02 0.6
2 10 14000 700 0.05 1 12000 500 0.04 0.8 9500 450 0.02 0.6
2 12 12000 600 0.04 1 10000 500 0.03 0.8 8200 400 0.01 0.6
2 16 10000 500 0.03 1 9200 400 0.02 0.8 7500 340 0.007 0.6
2 20 9200 380 0.02 1 8500 340 0.01 0.8 6000 260 0.005 0.6
3 8 14000 900 0.1 1.5 10000 800 0.07 1.2 8000 600 0.05 0.9
3 10 14000 900 0.1 1.5 10000 800 0.07 1.2 8000 600 0.05 0.9
3 12 12000 800 0.08 1.5 9200 700 0.06 1.2 7200 500 0.04 0.9
3 16 10000 700 0.007 1.5 8500 600 0.05 1.2 6500 400 0.03 0.9
3 20 9000 700 0.07 1.5 7800 600 0.04 1.2 5800 400 0.02 0.9

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 4 Flute Long Neck Flat End Mill File
Download 2: End Mill for Hardened Steel 4 Flute Long Neck Flat End Mill File

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