Dense coating with a secure interface
Substrate chemistry and microstructure promote diamond nucleation, reducing the risk of premature coating separation on the 4GEM series during abrasive cutting.
4GEM · Product family
4 Flute Long Shank Square End Mills for Graphite
Diamond coating · individual inspection · dimensional report available
4 Flute Long Shank Square End Mills for Graphite currently shows Ø3–20 mm across 19 standard order codes. It combines a fine-grain carbide substrate selected for diamond-deposition compatibility with a square-end geometry for flat pocket floors, slots, shoulders, side walls, and edge milling. Its long-shank reach is intended for deep walls and recessed features, where short projection, low runout, and controlled radial engagement are essential. Four flutes provide stable tooth engagement for finishing passes and controlled side milling.
Standard series specifications
Series-level specifications
Select the end geometry, flute count, and reach style for the required profile, cutting depth, and chip evacuation. The size and price table below lists every standard order code, key dimension, and USD/pc reference price for engineering selection and purchasing.
- Series code
- 4GEM
- Geometry
- Square end
- Flute count
- 4
- Diameter range
- Ø3–20 mm
- Reach style
- Long shank
- Standard size rows
- 19
- Substrate
- Solid carbide
- Coating
- Diamond coating
- Primary material
- Graphite electrodes and abrasive non-metals
4GEM coating and edge-retention evidence
A diamond system engineered for graphite, 10x longer life
Wear control at the peripheral edge and end teeth helps retain floor flatness, wall size, and a clean 90-degree feature transition. Its long-shank reach is intended for deep walls and recessed features, where short projection, low runout, and controlled radial engagement are essential.
About 74% less edge retreat after 60 minutes
The shown carbon-resin test records about 0.006 mm edge retreat for diamond coating versus 0.023 mm for TiAlN. For this square-end geometry for flat pocket floors, slots, shoulders, side walls, and edge milling, lower wear supports more consistent profile retention.
AK06 fine-grain carbide substrate
AK06 uses high-quality fine WC powder with controlled grain size and morphology, providing a diamond-compatible substrate for this 4-flute square end graphite end mill family.
Detailed codes, dimensions & reference prices
4GEM Series Size & Price Table
19 standard order codes with transparent online USD/pc FOB China prices updated 2026-Sep-14. Standard terms are 100% T/T in advance with a reference lead time of 10–15 working days. Final price and delivery are confirmed against quantity, dimensions, tolerance, and coating requirements.
Showing 19 of 19 rowsAll dimensions in mm
Default cutter diameter tolerance: -0.020 / 0 mm; default corner-radius tolerance: ±0.02 mm. Specify special tolerances in the RFQ.Quote selected codes
Starting parameters for graphite
4F Long Shank Square End cutting data selector
Choose cutter diameter, then select the applicable reach or taper combination to view spindle speed, feed rate, axial depth ap, and radial width ae. Use the result as a test-cut starting point and optimise for machine rigidity, actual overhang, runout, and graphite grade.
Select cutting condition
Use the selection to establish first-piece test-cut settings; final values depend on the machine and setup.
Selected reference
Ø3 mm · 4GEM · 4F
Spindle speed
18,000
rev/min
Feed rate
1,600
mm/min
Axial depth ap
3
mm
Radial width ae
0.3
mm
- Effective length
- —
- Taper angle
- —
- Vc
- 169.6 m/min
- fz
- 0.0222 mm/tooth
Compare all Ø3 mm parameter sets1 set · Expand
| Diameter D | RPM | Feed | ap | ae | Vc | fz |
|---|---|---|---|---|---|---|
| mm | rev/min | mm/min | mm | mm | m/min | mm/tooth |
| Ø3 | 18,000 | 1,600 | 3 | 0.3 | 169.6 | 0.0222 |
Recommended operations
Stable side milling and finer finishes in deep graphite features.
Selection notes
- 4-flute geometry: greater tooth engagement for stability and finish in high-speed finishing.
- Control runout and cutting load carefully at long overhang.
- Machine graphite dry with effective vacuum extraction; validate parameters for the graphite grade and CNC setup.
Rigidity and handling
Extreme hardness also means brittleness. Use a rigid CNC, precision holder, and secure workholding; control runout especially on long-reach and small-diameter tools, and avoid impact entry.
4GEM dimensional verification
Verified dimensions on every end mill
ZOLLER inspection for every 4GEM end mill
Cutter diameter, end-face geometry, runout, and cutting-edge condition are checked to support accurate slots, walls, and pocket floors. Long-shank sizes receive particular attention to runout over the extended geometry.
- Default cutter diameter tolerance: -0.020 / 0 mm
- Default cutter corner-radius tolerance: ±0.02 mm
- Dimensional report available for order acceptance and traceability
Square end abrasive-material machining
Built for abrasive graphite, carbon fiber, and fiberglass
The 4GEM series uses a square-end geometry for flat pocket floors, slots, shoulders, side walls, and edge milling. Its diamond-coated carbide edge is designed for graphite electrodes and, after application validation, abrasive non-metals such as CFRP and GFRP.
Square ends can machine abrasive composite edges and pockets where a flat floor is required; select entry and support to limit fibre breakout.
Include these items in your RFQ
- Drawing or existing tool code
- Diameter, flute/neck/shank/OAL dimensions
- End geometry, flute count, and radius
- Graphite grade or composite layup
- Machine, holder, and permitted runout
- Annual quantity and target lead time
Related graphite tooling
