CD8-203-08
2 Flute Regular Length Downshear Solid Carbide Spiral Router on 1/4" Dia. Shank
0.25-in Dia 2-Flute End Mill, 0.75-in LOC, 0.25-in Shank, 2.5-in OAL
OrderingCD8-203-08·Uncoated·$73.75Change finish
All sizes on 1/4" shanks for strength — spiral routers for signmaking, engraving and CNC production.
- Every size (1/16"-1/4" cutting dia) built on a 1/4" shank for strength and to fit standard router collets
- C8 = up-shear spiral (chips lift out of the cut); CD8 = down-shear spiral router (presses the surface down for chip-free top faces on laminates and signs)
- 2 flute stub (C8-201) and standard (C8-203); 3 flute stub (C8-301) and standard (C8-303); down-shear CD8 in 2 flute stub (CD8-201) and regular (CD8-203)
- 30° helix, square end with chamfer option, C-2 grade carbide
- DLC coated versions of every C8 size (-DLC)
- Materials: wood, aluminum, copper, magnesium, brass, plastics, composites
- Tolerances: cutting dia +.000/-.002 (1/16"-1/4"), shank dia -.0001/-.0002, OAL +/-.060
From the RobbJack Applications Guide.
About this series
CD8 Downshear Solid Carbide Spiral Routers
2 flute downshear spiral routers on 1/4" shanks for routing wood and plastics
The CD8 series is a 2 flute downshear solid carbide spiral router, a downshear companion to the C8 routers, offered in stub (CD8-201) and regular (CD8-203) lengths for signmaking, engraving and CNC production in wood and plastics. All sizes are on 1/4" shanks to fit router collets. Offered uncoated with optional DLC coating.
- 2 flute downshear spiral, square end, 30 degree helix
- Stub and regular lengths
- All sizes on 1/4" shanks to fit router collets
- Uncoated or DLC coated
Wood, aluminum, copper, magnesium, brass
Headline spec
Downshear, 2 flute, 30 degree helix, 1/4" shanks
Best for
- Signmaking and engraving routing
- CNC production routing
- Slotting, side milling, helical interpolation and ramping
Specifications
US machining terms with ISO 13399 codes.
- Cutting DiameterDC
- 0.25″
- Diameter ToleranceDC tol
- 0.0000/-0.0020
- Max Cutting DiameterDCX
- 0.25″
- Shank DiameterDMM
- 0.25″
- Length of Cut (LOC)APMX
- 0.75″
- Overall Length (OAL)OAL
- 2.5″
- Number of FlutesNOF
- 2
- Helix HandFHH
- Left-hand
- Cut Direction
- Right-hand cut
- End Type
- Square End
- Center Cutting
- Yes — plunges
- Shear Direction
- Down-shear
- Series
- CD8-203 — 2 Flute Regular Length Downshear Solid Carbide Spiral Router on 1/4" Dia. Shank
Cuts these materials
Applications
See it run
Tolerances
| Type | Min | Max |
|---|---|---|
| Cutting Diameter | 0 | -0.002 |
| Length of Cut | +0.03 | 0 |
| Overall Length | +0.06 | -0.06 |
| Shank Diameter | -0.0001 | -0.0002 |
Choose the finish(2 options)
Compare →Each finish is a different part number and price.
Not sure? Compare tool coatings — or leave it uncoated, the most common choice for aluminum.
Part CD8-203-08
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.
Uncoated
$73.75
CD8-203-08
Starting speeds & feeds for the CD8-203-08
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 | 786 | 12,000 | 76.8 | .00320 | .2500 | .0125 |
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 CD8-203 series
Same series, different size — what changes from this tool is shown in red.