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End MillMade in USA

TR-303-18

3 Flute Standard Length Tuffy Grade Carbide End Mill

0.5625-in Dia 3-Flute End Mill, 1.25-in LOC, 0.5625-in Shank, 3.5-in OAL

OrderingTR-303-18·Uncoated·$261.95Change finish

3 Flute Standard Length Tuffy Grade Carbide End Mill — TR-303-18
Series photo — representative of the TR-303 family
OAL 3.5″Flute 1.25″Shank Ø0.5625″Cutter Ø0.5625″Square
Scaled drawing — true to this tool's dimensions (inch)
Speeds & FeedsDialed to this exact tool — free
Free CAD & DataSTEP 3DDXF 2DISO CSVCAM library
RobbJack TR Series Tuffy grade carbide end mill, standard length with shank flats

3, 4, and 6 flute Tuffy grade carbide end mills in standard length -- a high-performance general line from 1/8" to 1" that runs in everything from aluminum and titanium to steel.

  • Three sub-series: TR-303 (3 flute), TR-404 (4 flute) from 1/8" to 3/4", and TR-606 (6 flute) at 1" diameter, all standard length, square end, 30-degree helix
  • Rated for high performance work: 3 flute covers slotting and side milling from roughing through finishing; 4 and 6 flute cover side milling, semi-finishing, and finishing
  • Shank flats on the 3/8", 1/2", 5/8", 3/4", and 1" sizes (smaller and in-between sizes do not come with flats); order any tool without flats by adding 'NF' to the tool number
  • Tolerances: cutting diameter +.001/-.000, shank diameter -.0001/-.0002, flute length +.030/-.000 (1/8" to 5/16") or +.060/-.000 (3/8" to 3/4"; TR-606 +.060/-.000), OAL +/-.060
  • Available uncoated or in TiN, TiCN, AlTiN, and DLC coatings
  • Materials: aluminum, copper, titanium, magnesium, cast iron, steel, brass, and wood; run dry, wet, cold air, or spray mist

From the RobbJack Applications Guide.

About this series

TR Standard / Extra Length Tuffy Grade Carbide End Mills

3, 4 and 6 flute square-end mills for steel and high-temp alloys

The TR series is a square-end Tuffy Grade carbide end mill with a 30 degree helix, offered in 3 flute (TR-303), 4 flute (TR-404) and 6 flute (TR-606) configurations. Many sizes come with flats; any tool can be ordered without flats by adding 'NF' to the tool number. Available uncoated and with TiN, TiCN, AlTiN and DLC coatings.

  • Square end with 30 degree helix
  • 3, 4 and 6 flute configurations
  • Comes with flats; order without flats by adding 'NF' to the tool number
  • Uncoated or TiN, TiCN, AlTiN, and DLC coated

Aluminum, copper, titanium, magnesium, cast iron, steel, brass, wood

Headline spec

30 degree helix, 3/4/6 flute, with flats

Best for

  • Slotting
  • Side milling
  • High performance roughing through finishing

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
0.5625″
Diameter ToleranceDC tol
0.0010/0.0000
Max Cutting DiameterDCX
0.5635″
Shank DiameterDMM
0.5625″
Length of Cut (LOC)APMX
1.25″
Overall Length (OAL)OAL
3.5″
Number of FlutesNOF
3
Helix AngleFHA
30°
Helix HandFHH
Right-hand
Cut Direction
Right-hand cut
End Type
Square End
Center Cutting
Yes — plunges
Series
TR-303 — 3 Flute Standard Length Tuffy Grade Carbide End Mill

Cuts these materials

AluminumCopper & BrassTitaniumMagnesiumCast IronSteel

Applications

SlottingSide MillingHigh PerformanceRoughingSemi-FinishingFinishingDryWetCold AirSpray Mist

See it run

Tolerances

TypeMinMax
Cutting Diameter+0.0010
Length of Cut+0.060
Overall Length+0.06-0.06
Shank Diameter-0.0001-0.0002

Choose the finish(5 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.

Uncoated · your price$261.95

Part TR-303-18

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 TR-303-18 · Uncoated · $261.95

Calculate Speeds & Feeds
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Download ISO 13399 data (.csv)

Proven in the field

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Uncoated

$261.95

TR-303-18

Starting speeds & feeds for the TR-303-18

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.

Starting speeds and feeds for RobbJack TR-303-18
MaterialOperationSFMRPMFeed (IPM)Chip load / toothDOC (in)WOC (in)
Gray IronRoughing — full slot5003,39673.3.00720.2813.5625
4140 SteelRoughing — full slot2201,4948.1.00180.2813.5625
303 StainlessRoughing — full slot5003,39627.5.00270.2813.5625

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 TR-303 series

Same series, different size — what changes from this tool is shown in red.