P820-201628-1
Diamond Coated End Mill for Mold Making and Graphite Electrodes
Diamond Coated Graphite Roughing End Mill 0.375in Dia, 1.250in LOC, 0.375in Shank, 4.0in OAL Burr-style diamond-facet cutting geometry; flute count of 4 is for speeds-and-feeds calculation purposes.
1/2" replaceable diamond-coated tips — 4 and 6 flute productivity from a slim heat-shrink holder
- 0.500" replaceable tip end mill: diamond coated (DCC) cutting head on a 1/4" h6 shank, 1/2" flute length, 1-1/2" OAL — intended to be held in a heat-shrink holder (pg 113)
- 4 and 6 flute productivity compared to the 2 flutes available from insert end mills this size
- Replaceable tips used in slim holders give extended reach without extra costs — replace the worn tip, keep the holder
- Four stock configurations: 6-flute square end (P820-201143-1), 4-flute square end (P820-201142-1), 4-flute .030" corner radius (P820-201206-1), 4-flute ball end (P820-201145-1)
- For graphite electrodes and composites; conventional, ramping, high-performance and 3-D roughing through finishing; run dry, cold air or spray mist
- Graphite speeds: soft 1000–2000 SFM, medium 750–1500 SFM, hard 500–1250 SFM; 1/2" roughing chipload 0.0100–0.0120 in soft graphite down to 0.0040–0.0060 finishing in hard graphite (pg 124)
- Standard tolerances: cutting dia +0.001/−0.001", shank h6, flute length ±0.060", OAL ±0.060"
- Related Lightning line (Crystallume 2019 catalog): threaded-tip end mills 3/8"–1" dia (threads T06/T08/T12/T15, square or ball) compatible with Ingersoll tool holders, plus P820 deep-cavity and extended-shank graphite end mills
From the RobbJack Applications Guide.
About this series
P820 Replaceable Tip End Mills
4- and 6-flute productivity in a replaceable-tip end mill.
RobbJack's diamond-coated 1/2" Replaceable Tip End Mill is intended to be held in a heat-shrink holder and gives 4- and 6-flute productivity compared to the 2 flutes available from insert end mills of this size. It runs on a 1/4" h6 shank, and several square-end, corner-radius, and ball-end configurations are available from stock. Replaceable tips are used in slim holders for extended reach without extra costs, and the tool is targeted at graphite electrodes and composites.
- Diamond Coated (DCC) for graphite and composites
- 4- and 6-flute productivity versus 2-flute insert end mills of the same size
- 1/2" cutter on a 1/4" h6 shank, held in a heat-shrink holder
- Square-end, corner-radius, and ball-end stock configurations
- Replaceable tips used in slim holders for extended reach without extra cost
Graphite and Composites. Dry, Cold Air, or Spray Mist. Applications: conventional, ramping, high performance, 3-D, roughing, semi-finishing, finishing.
Best for
- Machining graphite electrodes
- High-productivity 3-D work where extended reach is needed
Specifications
US machining terms with ISO 13399 codes.
- Cutting DiameterDC
- 0.375″
- Diameter ToleranceDC tol
- -0.0005/0.0000
- Max Cutting DiameterDCX
- 0.3745″
- Shank DiameterDMM
- 0.375″
- Length of Cut (LOC)APMX
- 1.25″
- Overall Length (OAL)OAL
- 4″
- Number of FlutesNOF
- 4
- End Type
- Square End
- Center Cutting
- Yes — plunges
- Tip Interface
- 1/4" h6 shank tip · heat-shrink slim holder
- Series
- P820 — Diamond Coated End Mill for Mold Making and Graphite Electrodes
Cuts these materials
Applications
See it run
Tolerances
| Type | Min | Max |
|---|---|---|
| Cutting Diameter | -0.001 | 0 |
| Length of Cut | -0.06 | +0.06 |
| Overall Length | -0.06 | +0.06 |
| Shank Diameter | -0.0003 | -0.0001 |
Made & shipped in the USA · lead time confirmed at order. Buy at retail or through your distributor.
Performance guaranteed. Run it against the tool you use today — if it doesn't beat it, we'll make it right.
Adds Diamond Coated (DCC) · $529.60 — our pick for your material. Choose another finish below.
Proven in the field
- $548,290saved per year drilling carbon-fiber aircraft
- $216,000saved per year trimming aircraft skins
- 1,000%metal-removal increase in Inconel 718 (SPS)
Finishes (1)
Diamond Coated (DCC)
RecP820-201628-1
$529.60
Available to order
Starting at
$529.60
Performance guaranteed
More in the P820 series
Same series, different size — what changes from this tool is shown in red.