graphite end mill graphite end mill graphite end mill

Graphite 4 Flutes Flat End Mill

SAMHO Diamond-Coated 4-Flute Flat End Mill — The Ultimate Tool for Precision Machincing

Stop letting abrasive materials wear out your tools and increase costs. The SAMHO diamond-Coated 4-flute flat end mill is engineered for high-precision CNC machining of graphite, ceramics, and other brittle non-metallic materials. Its high-adhesion diamond coating and optimized 4-flute geometry ensure exceptional tool life and stable performance in demanding applications.

  • Applicable Materials: Optimized for graphite electrodes, ceramic components, and brittle non-metallic materials.
  • High-Precision Machining: Flat end face and 4-flute design efficiently machine flat surfaces, slots, and complex contours, delivering consistent results and superior accuracy.
  • Surface Finish: Advanced cutting edge geometry produces smooth, mark-free finishes on graphite and ceramic parts.

In graphite manufacturing, machining operations place exceptionally high demands on cutting tools, requiring both precise performance and long-lasting durability. The SAMHO diamond coated 4 flute flat end mill for graphite (D1–12 mm) is engineered to meet these strict requirements. Its advanced diamond coating and optimized 4-flute design allow CNC operators to machine graphite and ceramic materials efficiently and accurately.


Advanced Technical Features

High-Adhesion Diamond Coating for Ultra-Long Tool Life
SAMHO’s proprietary diamond coating technology gives these 4-flute flat end mills exceptional hardness and chemical inertness:

  • Wear Resistance: Cutting edges stay sharp during prolonged dry cutting or light-load machining.
  • Micro-Chipping Prevention: The coating adheres firmly to the carbide substrate during high-speed cutting, reducing micro-chipping.
  • Optimized Flute Geometry: Engineered for efficient graphite and ceramic machining, ensuring stable performance.

Precision Flat End Face and 4-Flute Design

  • The flat end face and 4-flute geometry allow efficient machining of flat surfaces, slots, and complex contours.
  • Graphite Machining: Produces smooth, clean surface finishes, ideal for intricate electrode workpieces.
  • Ceramic Machining: Delivers high-precision finishes without any tool marks.

High-Efficiency 4-Flute “Cool-Cutting” Design

  • The sharp 4-flute geometry reduces cutting heat and improves chip evacuation.
  • Maximized Chip Evacuation: Quickly removes abrasive dust and debris from the cutting zone.
  • Reduced Cutting Load: Minimizes heat buildup, preventing cracks in brittle materials.

Ultra-Fine Grain Carbide Substrate and High-Precision Grinding

  • The high-strength, ultra-fine grain carbide substrate, precision-ground on specialized equipment, ensures excellent repeatability and accuracy.
  • Dimensional Tolerance Control: Strictly held within ±0.01 mm, ensuring batch-to-batch consistency.
  • Fracture Resistance: Enhances durability, especially for abrasive material machining.

Typical Applications

  • Graphite Machining: Ideal for high-precision milling of EDM electrodes, graphite molds, and structural components.
  • Ceramic Machining: Suitable for precision milling of zirconia and other brittle electrical ceramics.
  • Composite Materials: Efficiently mills glass fiber and carbon fiber reinforced plastics, providing excellent surface finish and machining stability.

Why Source Wholesale from SAMHO?

Exceptional Tool Life: High-adhesion diamond coating provides superior wear resistance and prevents micro-chipping, supporting both dry and high-speed cutting.

Outstanding Machining Precision: Precision flat-bottom tip and 4-flute design deliver high accuracy and repeatability for graphite, ceramics, and composite materials.

Strict Tolerances and High Reliability: Ultra-fine-grain carbide substrate ensures tight machining tolerances within ±0.01 mm while offering excellent resistance to fracture and wear.

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

graphite end mill

Total 20 models

Model Number Outside Diameter Length of Cut Effective Length Shank Taper Angle Overall Length Number of Flutes Shank Diameter In Stock
GRAS4-0100300 1 3 15° 50 4 4
GRAS4-0150450 1.5 4.5 15° 50 4 4
GRAS4-0200600 2 6 15° 50 4 4
GRAS4-0300900-3 3 9 15° 60 4 3
GRAS4-0300900 3 9 15° 50 4 4
GRAS4-0301200 3 12 15° 75 4 4
GRAS4-0401200 4 12 15° 60 4 4
GRAS4-0401600 4 16 15° 75 4 4
GRAS4-0602000 6 20 60 4 6
GRAS4-0602500 6 25 75 4 6
GRAS4-0603000 6 30 100 4 6
GRAS4-0802500 8 25 75 4 8
GRAS4-0803000 8 30 100 4 8
GRAS4-0803500 8 35 150 4 8
GRAS4-1003000 10 30 75 4 10
GRAS4-1003000-100 10 30 100 4 10
GRAS4-1004000-150 10 40 150 4 10
GRAS4-1204000-100 12 40 100 4 12
GRAS4-1205000-150 12 50 150 4 12
GRAS4-1205000-180 12 50 180 4 12

Contour Milling Parameters

Work Material Graphite
(mm) Diameter (mm) Overhang (min-1) Speed (mm/min) Feed Side Milling Ap(mm) Side Milling Ae(mm) Slotting Ap(mm) Slotting Ae(mm)
D1 4D 24000 1200 1D 0.05D 0.3D
D1 15D 24000 1200 0.5D 0.05D 0.2D
D1 25D 20000 1200 0.5D 0.05D 0.2D
D1.5 4D 22000 1500 1D 0.05D 0.3D
D1.5 10D 22000 1500 0.5D 0.05D 0.2D
D1.5 15D 18000 1500 0.5D 0.05D 0.2D
D2 4D 20000 1800 1D 0.05D 0.3D
D2 10D 20000 1800 0.5D 0.05D 0.2D
D2 15D 16000 1200 0.3D 0.05D 0.2D
D3 4D 20000 3000 1D 0.05D 0.3D
D3 10D 20000 2400 0.5D 0.05D 0.2D
D3 15D 18000 2000 0.3D 0.05D 0.2D
D4 4D 18000 2200 1.5D 0.05D 0.3D
D4 8D 15000 2000 0.7D 0.05D 0.2D
D4 12D 12000 1600 0.4D 0.05D 0.2D
D6 4D 13000 3000 2D 0.05D 0.3D
D6 8D 13000 3000 1D 0.05D 0.2D
D6 12D 8000 2000 0.6D 0.03D 0.2D
D8 4D 10000 3000 2D 0.05D 0.5D
D8 8D 10000 3000 1D 0.05D 0.3D
D8 12D 6000 2000 0.6D 0.03D 0.2D
D10 4D 8500 1600 2D 0.05D 0.5D
D10 8D 8500 1600 1D 0.05D 0.3D
D10 12D 6000 1200 0.6D 0.03D 0.2D
D12 4D 7500 1600 2D 0.05D 0.5D
D12 8D 7000 1600 1D 0.05D 0.3D
D12 12D 6000 1200 0.6D 0.03D 0.2D

Notes:
*Use a milling machine dedicated for graphite;

*Recommend air blow for graphite.

Download 2: Graphite 4 Flutes Flat End Mill File

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