WD1-203-12
2 Flute Standard Length Solid Carbide Downshear Router
0.375-in Dia 2-Flute End Mill, 1-in LOC, 0.375-in Shank, 2.5-in OAL
OrderingWD1-203-12·Uncoated·$83.35Change finish
2 Flute Solid Carbide Downshear Spiral Router — clean top edges, no fuzzing or chip-out
- 2 flute solid carbide downshear (down-cut) spiral router — flutes press the material DOWN, leaving a clean, splinter-free top surface on veneers, laminates, and thin sheets
- 30° helix, square end with corner chamfer
- WD1-201 stub length (3/16"–3/4" dia., 2"–4" OAL) and WD1-203 standard length (1/8"–3/4" dia., 1-1/2"–5-1/4" OAL, plus 16mm metric: 16mm dia. × 55mm flute × 118mm OAL)
- Cutting dia. tolerance +.000/−.002 (1/16"–1/4") and +.000/−.003 (9/32"–3/4"); shank dia. −.0001/−.0002; OAL ±.060
- Applications: slotting, side milling, helical interpolation, ramping, roughing, semi-finishing — dry, wet, cold air, or spray mist
- Materials: wood, aluminum, copper, magnesium, brass, plastics
- Diamond-Like Carbon (DLC) coating available
- Guitar building: the WD1 Series is RobbJack's pick for pocketing and for purfling and binding (Applications Guide p.194)
- WD1-310 variant: 3 flute, 10° helix, standard length downshear router for aluminum aircraft skins (1/2"–3/4" dia., p.71)
From the RobbJack Applications Guide.
About this series
WD1 Solid Carbide Downshear Routers
2 flute downshear spiral routers for wood, plastics and aluminum aircraft skins
The WD1 series is a 2 flute solid carbide downshear spiral router with a square end and 30 degree helix, offered in stub (WD1-201) and standard (WD1-203) lengths for wood and plastics CNC production. A 3 flute standard-length 10 degree helix version (WD1-310) is offered for routing aluminum aircraft skins, available with Mirror Edge for chatter reduction. DLC coating available.
- 2 flute downshear, square end, 30 degree helix
- Stub and standard lengths
- WD1-310 3 flute, 10 degree helix version for aluminum aircraft skins
- DLC coating available; Mirror Edge option for aircraft-skin version
Wood, aluminum, copper, magnesium, brass, plastics
Headline spec
Downshear, 2 flute, 30 degree helix
Best for
- Slotting and side milling
- Helical interpolation and ramping
- Roughing and semi-finishing
- Routing aluminum aircraft skins (WD1-310)
Specifications
US machining terms with ISO 13399 codes.
- Cutting DiameterDC
- 0.375″
- Diameter ToleranceDC tol
- 0.0000/-0.0020
- Max Cutting DiameterDCX
- 0.375″
- Shank DiameterDMM
- 0.375″
- Length of Cut (LOC)APMX
- 1″
- 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
- WD1-203 — 2 Flute Standard Length Solid Carbide Downshear Router
Cuts these materials
Applications
See it run
Tolerances
| Type | Min | Max |
|---|---|---|
| Cutting Diameter | 0 | -0.003 |
| Length of Cut | +0.06 | 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 WD1-203-12
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
$83.35
WD1-203-12
Starting speeds & feeds for the WD1-203-12
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 | Roughing — full slot | 1,179 | 12,000 | 230.4 | .00960 | .3750 | .3750 |
| Hardwoods | Finishing | 1,179 | 12,000 | 115.2 | .00480 | .3750 | .0188 |
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 WD1-203 series
Same series, different size — what changes from this tool is shown in red.
- WD1-203-04$26.00Ø 0.125″LOC 0.47″OAL 1.5″2 FL
- WD1-203-06$41.25Ø 0.1875″LOC 0.595″OAL 2″2 FL
- WD1-203-08$66.75Ø 0.25″LOC 0.72″2 FLOAL 2.5″
- WD1-203-16$204.20Ø 0.5″LOC 1.5″OAL 3.5″2 FL
- WD1-203-20$649.75Ø 0.625″LOC 2″OAL 4.625″2 FL
- WD1-203-24$698.95Ø 0.75″LOC 2.1875″OAL 5.25″2 FL
- WD1-201-06$38.25Ø 0.1875″LOC 0.345″OAL 2″2 FL
- WD1-201-08$38.25Ø 0.25″LOC 0.47″OAL 2″2 FL
- WD1-201-12$77.15LOC 0.625″OAL 2″Ø 0.375″2 FL
- WD1-201-16$179.40Ø 0.5″LOC 1.25″OAL 3.25″2 FL
- WD1-201-20$262.35Ø 0.625″LOC 1.5″OAL 3.5″2 FL
- WD1-201-24$426.40Ø 0.75″LOC 1.5″OAL 4″2 FL