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End MillMade in USA

MSTR-404-08

4 Flute Standard Length Metric Super Tuffy Grade Carbide Rougher

8mm Dia 4-Flute Metric End Mill 16mm LOC, 8mm Shank, 63mm OAL

4 Flute Standard Length Metric Super Tuffy Grade Carbide Rougher — MSTR-404-08
Series photo — representative of the MSTR-404 family
OAL 63 mmFlute 16 mmShank Ø8 mmCutter Ø8 mmSquare
Scaled drawing — true to this tool's dimensions (mm)
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RobbJack STR Series Super Tuffy grade carbide Ruffer roughing end mill with T-Process honed edges

3 and 4 flute Super Tuffy grade carbide Ruffers for steel and stainless -- T-Process honed roughing tools in stub and standard lengths, inch (STR) and metric (MSTR).

  • Dedicated roughing (Ruffer) geometry in Super Tuffy carbide for cast iron, steel, and stainless steel
  • Four sub-series: STR-301 (3 flute stub), STR-303 (3 flute standard), STR-401 (4 flute stub), STR-404 (4 flute standard), all square end with corner break and 30-degree helix
  • The whole STR Series comes with T-Process honed edges
  • Inch sizes from 1/4" to 3/4" (stub) and 1/4" to 1" (standard); metric MSTR-301/303/401/404 from 6 mm to 20 mm
  • Applications: slotting (3 flute stub), side milling, ramping, and roughing; run dry, wet, cold air, or spray mist
  • Shank flats on 3/8", 1/2", 5/8", 3/4", and 1" sizes (asterisked sizes and all metric tools do not come with flats); order without flats by adding 'NF' to the tool number
  • Roughing tolerances: cutting diameter -.003/-.007 (MSTR -.075/-.180 mm), shank diameter -.0001/-.0002, OAL +/-.060 (MSTR +/-10 mm)
  • Available uncoated or in TiN, TiCN, and AlTiN coatings

From the RobbJack Applications Guide.

About this series

MSTR Metric Super Tuffy Grade Carbide Ruffers

Metric honed-edge roughers for steel & stainless

MSTR is the metric variant of the STR Series: Super Tuffy Grade carbide ruffers with T-Process honed edge and 30 degree helix, in 3 flute (MSTR-301, MSTR-303) and 4 flute (MSTR-401, MSTR-404) geometries, uncoated or TiN, TiCN, AlTiN coated, 6-20 mm sizes. Metric tools do not have flats.

  • 3 flute and 4 flute roughing geometries
  • Square end with corner break, 30 degree helix
  • T-Process honed edge
  • Available uncoated or TiN, TiCN, AlTiN coated
  • Metric sizes 6 mm to 20 mm; metric tools do not have flats

Cast iron, steel and stainless steel. Slotting, side milling, ramping and roughing.

Headline spec

Metric Super Tuffy Grade carbide ruffer, T-Process honed edge, 30 degree helix

Best for

  • Metric high-removal roughing
  • Steel and stainless steel

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
8 mm
Diameter ToleranceDC tol
-0.075/-0.180
Shank DiameterDMM
8 mm
Length of Cut (LOC)APMX
16 mm
Overall Length (OAL)OAL
63 mm
Corner ChamferCHW
0.25MM/0.50MM
Number of FlutesNOF
4
Helix AngleFHA
30°
Helix HandFHH
Right-hand
Cut Direction
Right-hand cut
End Type
Square End
Center Cutting
Yes — plunges
Series
MSTR-404 — 4 Flute Standard Length Metric Super Tuffy Grade Carbide Rougher

Cuts these materials

Cast IronSteelStainless Steel

Applications

Side MillingRampingRoughingDryWetCold AirSpray Mist

Features

T-Process Hone

See it run

Tolerances

TypeMinMax
Cutting Diameter-0.075-0.18
Length of Cut+0.5+1.5
Overall Length+1-1
Shank Diameter-0.002-0.005
Starting at$144.80

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) · $151.70 — 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)

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Starting at

$144.80

Performance guaranteed

More in the MSTR-404 series

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