Skip to content
End MillRouterMade in USA

SB-301-24

3 Flute Ball End Stub Length Tuffy Grade Carbide End Mill

0.75-in Dia 3-Flute End Mill, 1-in LOC, 0.75-in Shank, 4-in OAL, 0.375-in CR

OrderingSB-301-24·Uncoated·$520.40Change finish

3 Flute Ball End Stub Length Tuffy Grade Carbide End Mill — SB-301-24
Series photo — representative of the SB-301 family
OAL 4″Flute 1″Shank Ø0.75″Cutter Ø0.75″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 SB Series Tuffy grade carbide ball end mill, stub length

2 and 3 flute Tuffy grade carbide ball end mills in stub length -- rigid short-flute ball tools for 3-D work from 1/16" to 3/4" inch and 1.5 mm to 20 mm metric.

  • Ball end, stub-length flutes for rigidity: SB-201 (2 flute) and SB-301 (3 flute), both 30-degree helix
  • Inch sizes from 1/16" to 3/4"; metric MSB-201 from 2 mm to 20 mm and MSB-301 from 1.5 mm to 20 mm
  • Applications: slotting, side milling, helical interpolation, conventional and ramping 3-D work, high performance, roughing, semi-finishing, and finishing
  • Materials: aluminum, copper, magnesium, cast iron, plastics, brass, and wood
  • New coatings available -- uncoated, TiN, TiCN, AlTiN, and DLC
  • Tolerances: cutting diameter +.000/-.002 (1/16" to 1/4") or +.000/-.003 (9/32" to 3/4"), shank diameter -.0001/-.0002, flute length +.030/-.000 (1/16" to 5/16") or +.060/-.000 (3/8" to 3/4"), OAL +/-.060; MSB cutting diameter +.000/-.075 mm

From the RobbJack Applications Guide.

About this series

SB / MSB Ball End Stub Length Tuffy Grade Carbide End Mills

2 and 3 flute ball-end mills for 3-D, die and mold work

The SB series is a ball-end, stub-length Tuffy Grade carbide end mill with a 30 degree helix, offered in 2 flute (SB-201) and 3 flute (SB-301) configurations. MSB is the metric equivalent. Available uncoated and with TiN, TiCN, AlTiN and DLC coatings.

  • Ball end, stub length, 30 degree helix
  • 2 and 3 flute configurations
  • Inch (SB) and metric (MSB) versions
  • Uncoated or TiN, TiCN, AlTiN, and DLC coated

Aluminum, copper, magnesium, cast iron, plastics, brass, wood

Headline spec

Ball end, stub length, 30 degree helix, 2/3 flute

Best for

  • 3-D machining
  • Slotting and side milling
  • Helical interpolation, conventional and ramping
  • High performance roughing through finishing

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
0.75″
Diameter ToleranceDC tol
0.0000/-0.0020
Max Cutting DiameterDCX
0.75″
Shank DiameterDMM
0.75″
Length of Cut (LOC)APMX
1″
Overall Length (OAL)OAL
4″
Corner RadiusRE
0.375″
Number of FlutesNOF
3
Helix AngleFHA
30°
Helix HandFHH
Right-hand
Cut Direction
Right-hand cut
End Type
Ball End
Center Cutting
Yes — plunges
Series
SB-301 — 3 Flute Ball End Stub Length Tuffy Grade Carbide End Mill

Cuts these materials

AluminumCopper & BrassMagnesiumCast IronPlastics

Applications

SlottingSide MillingHelical InterpolationConventionalRampingHigh Performance3-DRoughingSemi-FinishingFinishing

See it run

Tolerances

TypeMinMax
Cutting Diameter0-0.003
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$520.40

Part SB-301-24

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 SB-301-24 · Uncoated · $520.40

Calculate Speeds & Feeds
CADDXF·STEP
Add to Quote
Download ISO 13399 data (.csv)

Proven in the field

See the case studies →

Uncoated

$520.40

SB-301-24

Starting speeds & feeds for the SB-301-24

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 SB-301-24
MaterialOperationSFMRPMFeed (IPM)Chip load / toothDOC (in)WOC (in)
AcetalRoughing — full slot1,6008,149400.01636.3200.7500
AcetalFinishing1,6008,149234.7.00960.7500.0375
Carbon Fiber CFRPRoughing — full slot8004,07573.3.00600.7500.7500
Carbon Fiber CFRPFinishing8004,07536.7.00300.7500.0375
GraphiteRoughing — full slot1,0005,093293.4.01920.6545.7500
GraphiteFinishing1,0005,093146.7.00960.7500.0375

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 SB-301 series

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