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End MillMade in USA

MB-203-04

2 Flute Metric Tuffy Ball End Standard Length Metric Tuffy Grade Carbide End Mill

4mm Dia 2-Flute Metric End Mill 12mm LOC, 4mm Shank, 50mm OAL

2 Flute Metric Tuffy Ball End Standard Length Metric Tuffy Grade Carbide End Mill — MB-203-04
Series photo — representative of the MB-203 family
OAL 50 mmFlute 12 mmShank Ø4 mmCutter Ø4 mmBall
Scaled drawing — true to this tool's dimensions (mm)
Speeds & FeedsDialed to this exact tool — free
Free CAD & DataSTEP 3DDXF 2DISO CSVCAM library
RobbJack B-203-12 two-flute Tuffy grade carbide ball end mill, 3/8-inch diameter

Tuffy grade carbide ball end mills — 2, 3 and 4 flute, from 1/16-inch to 3/4-inch

  • B-203 2 flute ball end, standard length: fourteen inch sizes from 1/16-in to 3/4-in on 1-1/2-in to 4-in OALs
  • MB-203 metric line: 2 mm to 20 mm ball diameters, 38–104 mm overall lengths
  • B-300 3 flute ball end stub length and B-330 3 flute standard length: 1/8-in to 3/4-in, listed in the Steel & Hi-Temp Alloys section
  • B-440 4 flute ball end standard length with 40-degree helix (also MB-440 metric) for hardened-material finishing
  • Tuffy sub-micrograin carbide grade across the family
  • Coatings available on every size: TiN (-T), TiCN (-C), AlTiN (-A) and DLC (-DLC)

From the RobbJack Applications Guide.

About this series

MB Metric Tuffy Grade Carbide Ball End Mills

Metric honed-edge ball end mills for 3-D work

MB is the metric variant of the B Series: Tuffy Grade carbide ball end mills with T-Process honed edge. Available as MB-440 (4 flute, 40 degree helix standard length), uncoated or TiN, TiCN, AlTiN coated, in 3-20 mm sizes.

  • 4 flute ball end (MB-440), 40 degree helix
  • T-Process honed edge
  • Available uncoated or TiN, TiCN, AlTiN coated
  • Metric sizes 3 mm to 20 mm

Cast iron, steel, stainless steel and super alloys. Slotting, side milling, helical interpolation, ramping, 3-D, roughing and finishing.

Headline spec

Metric Tuffy Grade carbide ball end mill with T-Process honed edge

Best for

  • Metric 3-D and die/mold machining
  • Steel, stainless and super alloys

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
4 mm
Diameter ToleranceDC tol
0.000/-0.002
Shank DiameterDMM
4 mm
Length of Cut (LOC)APMX
12 mm
Overall Length (OAL)OAL
50 mm
Corner RadiusRE
2 mm
Number of FlutesNOF
2
Helix AngleFHA
30°
Helix HandFHH
Right-hand
Cut Direction
Right-hand cut
End Type
Ball End
Center Cutting
Yes — plunges
Series
MB-203 — 2 Flute Metric Tuffy Ball End Standard Length Metric Tuffy Grade Carbide End Mill

Cuts these materials

AluminumCopper & BrassMagnesiumCast IronPlasticsWood

Applications

SlottingSide MillingHelical InterpolationConventionalRampingHigh Performance3-DRoughingSemi-FinishingFinishing

See it run

Tolerances

TypeMinMax
Cutting Diameter0-0.002
Length of Cut+0.030
Overall Length+0.06-0.06
Shank Diameter-0.0001-0.0002
Starting at$50.60

Made & shipped in the USA · lead time confirmed at order. Buy at retail or through your distributor.

Performance guaranteed. Run it against the tool you use today — if it doesn't beat it, we'll make it right.

Adds Aluminum Titanium Nitride (AlTiN) · $52.90 — our pick for your material. Choose another finish below.

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Download ISO 13399 data (.csv)

Proven in the field

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Finishes (5)

Compare tool coatings →

Starting at

$50.60

Performance guaranteed

More in the MB-203 series

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