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End MillMade in USA

B-440-10

4 Flute Ball End Standard Length Tuffy Grade Carbide End Mill

0.3125-in Dia 4-Flute End Mill, 0.8125-in LOC, 0.3125-in Shank, 2.5-in OAL, 0.15625-in CR

4 Flute Ball End Standard Length Tuffy Grade Carbide End Mill — B-440-10
Series photo — representative of the B-440 family
OAL 2.5″Flute 0.8125″Shank Ø0.3125″Cutter Ø0.3125″Ball
Scaled drawing — true to this tool's dimensions (inch)
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

B / MB Tuffy Grade Carbide Ball End Mills

Honed-edge ball end mills for 3-D work in steel & alloys

The B Series are Tuffy Grade carbide ball end mills with a T-Process honed edge for die/mold and 3-D machining. Available in 3 flute (B-300 stub and B-330 standard, 30 degree helix) and 4 flute (B-440 standard, 40 degree helix), uncoated or TiN, TiCN, AlTiN coated, plus metric MB equivalents.

  • 3 flute (B-300/B-330) and 4 flute (B-440) ball end geometries
  • 30 degree (3 flute) and 40 degree (4 flute) helix
  • T-Process honed edge
  • Available uncoated or TiN, TiCN, AlTiN coated
  • Inch (B) and metric (MB) sizes

Cast iron, steel, stainless steel and super alloys. Applications: slotting, side milling, helical interpolation, conventional, ramping, high-performance 3-D, roughing, semi-finishing and finishing.

Headline spec

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

Best for

  • 3-D and die/mold machining
  • Steel, stainless and super alloys
  • Roughing through finishing

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
0.3125″
Diameter ToleranceDC tol
0.0000/-0.0020
Max Cutting DiameterDCX
0.3125″
Shank DiameterDMM
0.3125″
Length of Cut (LOC)APMX
0.8125″
Overall Length (OAL)OAL
2.5″
Corner RadiusRE
0.1563″
Number of FlutesNOF
4
Helix AngleFHA
40°
Helix HandFHH
Right-hand
Cut Direction
Right-hand cut
End Type
Ball End
Center Cutting
Yes — plunges
Series
B-440 — 4 Flute Ball End Standard Length Tuffy Grade Carbide End Mill

Cuts these materials

Cast IronSteelStainless SteelSuperalloys (Inconel…)

Applications

Side MillingHelical InterpolationConventionalRampingHigh Performance3-DRoughingSemi-FinishingFinishing

Features

T-Process Hone

See it run

Tolerances

TypeMinMax
Cutting Diameter0-0.003
Length of Cut+0.030
Overall Length+0.06-0.06
Shank Diameter-0.0001-0.0002
Starting at$77.10

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) · $84.00 — 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 (4)

Compare tool coatings →

Starting at

$77.10

Performance guaranteed

More in the B-440 series

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