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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