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End MillMade in USA

EX-204-14

2 Flute Extra Length Tuffy Grade Carbide End Mill

0.4375-in Dia 2-Flute End Mill, 0.75-in LOC, 0.4375-in Shank, 3.75-in OAL, 2.25-in Reach

OrderingEX-204-14·$235.75

2 Flute Extra Length Tuffy Grade Carbide End Mill — EX-204-14
Series photo — representative of the EX-204 family
OAL 3.75″Flute 0.75″Reach 2.25″Shank Ø0.4375″Cutter Ø0.4375″SquareBlend 15°
Scaled drawing — true to this tool's dimensions (inch)
Speeds & FeedsDialed to this exact tool — free
Free CAD & DataSTEP 3DDXF 2DISO CSVCAM library
RobbJack EX Series 2 flute extra length Tuffy grade carbide end mill with necked extended reach

2 flute Tuffy grade carbide end mills in extra length and extra-length extended reach -- necked designs with up to 4 inches of reach for deep non-ferrous work.

  • Necked square-end design with 30-degree helix -- the reach dimension is called out separately from flute length
  • EX-204 (2 flute extra length): 1/8" to 1/2" diameters with 2" to 2-1/2" reach and 3" to 4" overall length
  • EX-206 (2 flute extra length extended reach): 1/2" to 1" diameters, all with 4" reach and 6" overall length
  • Shank flats on the 3/8" and 1/2" EX-204 sizes; other sizes come without flats, and NF versions are listed for the flat sizes
  • Applications: slotting, side milling, helical interpolation, roughing, semi-finishing, and finishing; run wet, cold air, or spray mist
  • Materials: aluminum, copper, magnesium, plastics, brass, and wood
  • Tolerances: cutting diameter -.001/-.002 at 1/8" and +.001/-.000 from 3/16" to 1", shank diameter -.0001/-.0002, flute length +.060/-.000, OAL +/-.060
  • Have chatter? The guide points to RobbJack's FM Series (guide page 16)

From the RobbJack Applications Guide.

About this series

EX Extra Length Tuffy Grade Carbide End Mills

2 flute extended-reach, necked square-end mills

The EX series is a 2 flute, extra-length, square-end Tuffy Grade carbide end mill with a 30 degree helix and necked design. EX-204 is the extra-length version and EX-206 is the extra-length extended-reach version, with reach up to 4" and overall lengths up to 6". Tools are available with or without flats (add 'NF').

  • 2 flute square end, 30 degree helix, necked
  • Extended reach (EX-206 reaches 4" with 6" OAL)
  • Available with or without flats

Aluminum, copper, magnesium, plastics, brass, wood

Headline spec

Extra length, necked, 2 flute, 30 degree helix

Best for

  • Slotting and side milling
  • Helical interpolation
  • Roughing through finishing

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
0.4375″
Diameter ToleranceDC tol
0.0010/0.0000
Max Cutting DiameterDCX
0.4385″
Shank DiameterDMM
0.4375″
Length of Cut (LOC)APMX
0.75″
Reach (LBS)SDL
2.25″
Neck DiameterND
0.4156″
Overall Length (OAL)OAL
3.75″
Number of FlutesNOF
2
Helix AngleFHA
30°
Helix HandFHH
Right-hand
Cut Direction
Right-hand cut
Blend Angle (neck→shank)
15°
Feather Blend
10°
End Type
Square End
Center Cutting
Yes — plunges
Series
EX-204 — 2 Flute Extra Length Tuffy Grade Carbide End Mill

Cuts these materials

AluminumCopper & BrassMagnesiumPlastics

Applications

SlottingSide MillingHelical InterpolationRoughingSemi-FinishingFinishingWetCold AirSpray Mist

Features

Necked

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
EX-204-14In stock$235.75
Uncoated · your price$235.75

Part EX-204-14

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 EX-204-14 · · $235.75

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Download ISO 13399 data (.csv)

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Starting at

$235.75

EX-204-14

Starting speeds & feeds for the EX-204-14

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 EX-204-14
MaterialOperationSFMRPMFeed (IPM)Chip load / toothDOC (in)WOC (in)
6061(T4-T6) AluminumRoughing — full slot1,37612,000268.8.01120.4375.4375
6061(T4-T6) AluminumFinishing1,37612,000134.4.00560.4375.0219
Free-Cutting BrassRoughing — full slot7506,54973.3.00560.4375.4375
Free-Cutting BrassFinishing7506,54936.7.00280.4375.0219
AcetalRoughing — full slot1,37612,000268.8.01120.4375.4375
AcetalFinishing1,37612,000134.4.00560.4375.0219

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 EX-204 series

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