Secure coating-to-substrate interface
The substrate chemistry and microstructure promote dense diamond nucleation, reducing the risk of premature coating separation in abrasive graphite cutting.
4GEM · Standard order code with online price
D20*90FL*200 OAL*20SH*4F
4F Long Shank Square End · Order code: 4GEM 200 900 200
D20*90FL*200 OAL*20SH*4F diamond-coated square end graphite end mill in the 4GEM series. Online reference price USD 317.20/pc as of 2026-Sep-14; order code 4GEM 200 900 200.
Price available online
$317.20
USD / pc · FOB China
Price as of 2026-Sep-14
Published online for purchasing budgets and size comparison
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, tolerance, and order requirements.
- Order code
- 4GEM 200 900 200
- Product family
- 4GEM
- Substrate / coating
- Solid carbide / diamond
- Quality documentation
- Dimensional report available
D20*90FL*200 OAL*20SH*4F engineering specification
Technical dimensions table
Order code: 4GEM 200 900 200
All linear dimensions in mm
| Parameter | Symbol | Value | Purchasing / inspection note |
|---|---|---|---|
| Cutter diameter | D | 20 mm | Nominal cutting diameter; default tolerance -0.020 / 0 mm |
| Ball / corner radius | R | — | Not applicable to this specification |
| Flute length | L1 | 90 mm | Cutting edge length |
| Neck diameter | dN | — | Neck diameter not specified for this item |
| Neck length | L2 | — | Neck length not specified for this item |
| Shank diameter | d | 20 mm | Nominal shank diameter |
| Overall length | L | 200 mm | Overall length (OAL) |
| Flute count | Z | 4 | Number of flutes |
Inspection basis: Default cutter diameter tolerance -0.020 / 0 mm; default corner-radius tolerance ±0.02 mm. State special tolerances and dimensional-report requirements on the purchase order.
Diamond coating and edge retention
A diamond system engineered for graphite, 10x longer life
D20*90FL*200 OAL*20SH*4F combines a fine-grain carbide substrate with a graphite-specific diamond coating. On this square end tool, lower edge wear helps retain the specified dimensions and cutting profile during production.
About 74% less edge retreat after 60 minutes
In the shown carbon-resin test, diamond coating records about 0.006 mm edge retreat versus about 0.023 mm for TiAlN. Lower wear supports more consistent machined dimensions.
AK06 fine-grain carbide substrate
AK06 uses high-quality fine WC powder with controlled grain size and morphology, providing a diamond-compatible substrate for D20*90FL*200 OAL*20SH*4F.
ZOLLER dimensional inspection
Verified dimensions on every end mill
D20*90FL*200 OAL*20SH*4F
Every tool is checked for critical dimensions and cutting geometry using an optical measurement system. A dimensional report for order code 4GEM 200 900 200 is available for incoming inspection and traceability.
- Nominal cutter diameter: 20 mm; default tolerance -0.020 / 0 mm
- Dimensional report available
Starting parameters for graphite
Cutting data for D20*90FL*200 OAL*20SH*4F
Use these values as the initial setup for diamond-coated solid carbide end milling in graphite. Validate by test cut and optimise for machine rigidity, tool overhang, runout, and dust extraction.
Spindle speed
5,000
rev/min
Feed rate
2,400
mm/min
Axial depth ap
20
mm
Radial width ae
2
mm
- Reference diameter
- Ø20 mm
- Flutes
- 4
- Effective length
- —
- Taper angle
- —
- Vc
- 314.2 m/min
- fz
- 0.12 mm/tooth
Nearby 4GEM standard sizes
Compare dimensions and online prices
D20*75FL*160 OAL*20SH*4F
$260.40Order code: 4GEM 200 750 160
Ø20 · 4F · OAL 160 mm
D20*100FL*320 OAL*20SH*4F
$487.60Order code: 4GEM 200 1000 320
Ø20 · 4F · OAL 320 mm
D16*80FL*200 OAL*16SH*4F
$213.80Order code: 4GEM 160 800 200
Ø16 · 4F · OAL 200 mm
D16*70FL*160 OAL*16SH*4F
$176.40Order code: 4GEM 160 700 160
Ø16 · 4F · OAL 160 mm
D12*60FL*200 OAL*12SH*4F
$130.40Order code: 4GEM 120 600 200
Ø12 · 4F · OAL 200 mm
D12*60FL*150 OAL*12SH*4F
$102.80Order code: 4GEM 120 600 150
Ø12 · 4F · OAL 150 mm
Request pricing: D20*90FL*200 OAL*20SH*4F
Send the order quantity, work material, machine setup, and target delivery. We will confirm order pricing, production scheduling, and dimensional-report requirements using the 2026-Sep-14 online reference price as the starting point; order code 4GEM 200 900 200.
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