WRU-303-16
3 Flute Standard Rougher Solid Carbide Upshear Router
0.5-in Dia 3-Flute End Mill, 2.1875-in LOC, 0.5-in Shank, 4-in OAL
OrderingWRU-303-16·Uncoated·$263.65Change finish
3 Flute Rougher Solid Carbide Upshear Router — Spiral Routers for Rough Cutting
- 3 flute solid carbide upshear ROUGHER — serrated roughing profile breaks chips small for fast, heavy stock removal
- 30° helix, square end with corner chamfer
- WRU-301 stub rougher (1/2"–3/4" dia., 3-1/2"–5" OAL) and WRU-303 standard rougher (1/2"–3/4" dia., 4"–5" OAL, plus 16mm metric: 16mm dia. × 55mm flute × 118mm OAL)
- Deliberately ground undersize for roughing: cutting dia. tolerance −.003/−.007; shank dia. −.0001/−.0002; flute length +.060/−.000; 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
- Diamond-Like Carbon (DLC) coating available
- Guitar building: WRU/WRD Series handle roughing of blanks and bodies (Applications Guide p.194)
From the RobbJack Applications Guide.
About this series
WRU Rougher Solid Carbide Upshear Routers
3 flute upshear rougher routers for fast wood and plastics stock removal
The WRU series is a 3 flute solid carbide upshear rougher spiral router with a square end and 30 degree helix, offered in stub (WRU-301) and standard (WRU-303) rougher lengths for wood and plastics rough cutting. DLC coating available.
- 3 flute upshear rougher, square end, 30 degree helix
- Stub and standard rougher lengths
- DLC coating available
Wood, aluminum, copper, magnesium, brass
Headline spec
Rougher, 3 flute upshear, 30 degree helix
Best for
- Rough cutting
- Slotting and side milling
- Helical interpolation and ramping
Specifications
US machining terms with ISO 13399 codes.
- Cutting DiameterDC
- 0.5″
- Diameter ToleranceDC tol
- 0.0000/-0.0020
- Max Cutting DiameterDCX
- 0.5″
- Shank DiameterDMM
- 0.5″
- Length of Cut (LOC)APMX
- 2.1875″
- Overall Length (OAL)OAL
- 4″
- Corner ChamferCHW
- 0.020/0.030
- Number of FlutesNOF
- 3
- Helix AngleFHA
- 30°
- Helix HandFHH
- Right-hand
- Cut Direction
- Right-hand cut
- End Type
- Square End
- Center Cutting
- Yes — plunges
- Shear Direction
- Up-shear
- Series
- WRU-303 — 3 Flute Standard Rougher Solid Carbide Upshear Router
Cuts these materials
Applications
See it run
Tolerances
| Type | Min | Max |
|---|---|---|
| Cutting Diameter | -0.003 | -0.007 |
| 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 WRU-303-16
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
$263.65
WRU-303-16
Starting speeds & feeds for the WRU-303-16
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 | 1,572 | 12,000 | 400 | .01111 | .4800 | .5000 |
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 WRU-303 series
Same series, different size — what changes from this tool is shown in red.