P820-201485-1
Diamond Coated End Mill for Mold Making and Graphite Electrodes
Diamond Coated Graphite Roughing End Mill 0.500in Dia, 1.750in LOC, 0.500in Shank, 4.0in OAL
OrderingP820-201485-1·Diamond Coating (DCC)·$662.95
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
- 0.5″
- Diameter ToleranceDC tol
- -0.0005/0.0000
- Max Cutting DiameterDCX
- 0.4995″
- Shank DiameterDMM
- 0.5″
- Length of Cut (LOC)APMX
- 1.75″
- 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 |
Choose the finish(1 option)
Compare →Each finish is a different part number and price.
Part P820-201485-1
Made & shipped in the USA · lead time confirmed at order. Test this tool in your spindle at retail, or get it through your RobbJack distributor.
Performance guaranteed. Run it against the tool you use today — if it doesn't beat it, we'll make it right.
Adds P820-201485-1 · Diamond Coating (DCC) · $662.95
DCC
$662.95
P820-201485-1
Starting speeds & feeds for the P820-201485-1
Dial in for your machine →RobbJack's tested starting numbers for this exact tool, from the same engine and the same default machine as the calculator: a 12,000 RPM / 400 IPM / 30 HP machining center, rigid setup, full-depth cut. A faster or smaller spindle changes the RPM and feed — enter yours in the calculator and it re-governs every number.
| Material | Operation | SFM | RPM | Feed (IPM) | Chip load / tooth | DOC (in) | WOC (in) |
|---|---|---|---|---|---|---|---|
| Hardwoods | Finishing | 1,572 | 12,000 | 307.2 | .00640 | .5000 | .0250 |
Read before you run
Recommendations are computed starting points based on typical conditions — not guarantees of performance, tool life, or fitness for your application. Machining involves inherent risk: you are solely responsible for safe operation, for verifying every parameter against your machine, spindle, toolholding, workholding, and guarding limits, and for proving all parameters on a test cut before production. RobbJack Corporation assumes no liability for tool breakage, machine damage, scrapped parts, production loss, or personal injury arising from use of these recommendations. By using this calculator you accept RobbJack's Terms & Conditions.
More in the P820 series
Same series, different size — what changes from this tool is shown in red.