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End MillMade in USA

SPS-503-16-030

SPS Super Python — 5 Flute Variable Helix Standard Length Tuffy Grade Carbide End Mill

RobbJack SPS Super Python Series — Tuffy-grade carbide that strikes harder and cuts faster. Variable-helix, all-center-cutting geometry for aggressive metal removal in stainless, super alloys, Inconel, titanium and steel to 45 HRc. 0.5-in Dia 5-Flute End Mill, 1.25-in LOC, 0.5-in Shank, 3-in OAL, 0.03 CR

OrderingSPS-503-16-030·Aluminum Titanium Nitride (AlTiN)·$122.90

SPS Super Python — 5 Flute Variable Helix Standard Length Tuffy Grade Carbide End Mill — SPS-503-16-030
Series photo — representative of the SPS-503 family
OAL 3″Flute 1.25″Shank Ø0.5″Cutter Ø0.5″R0.03″
Scaled drawing — true to this tool's dimensions (inch)
Speeds & FeedsDialed to this exact tool — free
Free CAD & DataSTEP 3DDXF 2DISO CSVCAM library
Macro photo of a RobbJack SPS Super Python variable-helix carbide end mill with dark AlTiN coating

The Super Python: RobbJack's flagship variable-helix, all-center-cutting Tuffy grade end mills — up to 1031% more metal removed per minute in Inconel 718.

  • Variable-helix, all-center-cutting geometry in Tuffy grade carbide, AlTiN coated — built to take the most aggressive cuts in the toughest materials
  • Materials: stainless, super alloys, Inconel, titanium, cast iron, and steels to 45 HRc
  • Headline result: 1031% more metal removed per minute in an Inconel 718 full slot — 0.130 in³/min in one pass vs 0.0127 in³/min for a typical high-performance tool (1/4" tool demonstration)
  • 4 flute (SPS-401 stub, SPS-403 standard, SPS-405 extended) and 5 flute (SPS-501, SPS-503, SPS-505) versions, 1/4"–1" cutting diameter
  • Flute lengths from 1/2" (1/4" stub) up to 2-5/8" on 5" OAL standard-length 1" tools
  • Seven standard corner radii per diameter (e.g. .010"–.190" on catalog sizes) plus ball-end (-BN) versions
  • Optional flats (-FL) for high-torque tool holding
  • Applications: slotting, side milling, helical interpolation, ramping, high-performance roughing, semi-finishing, and finishing — dry, wet, cold air, or spray mist
  • Every part number stocked and made in the USA

From the RobbJack Applications Guide.

All center cutting
All center cutting — The Super Python's end teeth up close: every flute cuts to center with a protective corner radius, so the tool can plunge, ramp, and helical-interpolate straight into the toughest alloys.
Proof in the cut
Proof in the cut — A slotting demonstration cut from the SPS demo: full slots machined pass after pass in round stock — the same demonstration behind the Inconel 718 result of 0.130 in³/min in one pass versus 0.0127 in³/min for a typical high-performance tool.

About this series

SPS Super Python Series

Strikes harder. Cuts faster.

Tuffy-grade carbide end mills with revolutionary variable-helix, all-center-cutting geometry built to take the most aggressive cuts in the toughest materials — stainless, super alloys, Inconel, titanium and steel up to 45 HRc — at dramatically higher metal-removal rates.

  • Variable helix, all center-cutting for aggressive, stable cuts
  • 4- and 5-flute, stub / standard / extra-long lengths
  • 7 standard corner radii plus optional flats (-FL) for high torque
  • Every part number in stock

Headline spec

Up to 1000% MRR increase (Inconel 718, 1/4" full slot)

Best for

  • Inconel & super alloys
  • Stainless & titanium
  • Hardened steel to 45 HRc

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
0.5″
Shank DiameterDMM
0.5″
Length of Cut (LOC)APMX
1.25″
Overall Length (OAL)OAL
3″
Corner RadiusRE
0.03″
Number of FlutesNOF
5
Helix AngleFHA
Variable
End Type
Corner Radius
Center Cutting
Yes — plunges
Shank Flats
Available (-FL)
Series
SPS-503 — SPS Super Python — 5 Flute Variable Helix Standard Length Tuffy Grade Carbide End Mill

Cuts these materials

TitaniumCast IronSteelStainless SteelSuperalloys (Inconel…)Hardened 30–40 HRc

Applications

Side MillingHelical InterpolationRampingHigh PerformanceRoughingSemi-FinishingFinishingDryWetCold AirSpray Mist

See it run · 2 videos

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Each finish is a different part number and price.

AlTiN · your price$122.90

Part SPS-503-16-030

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 SPS-503-16-030 · Aluminum Titanium Nitride (AlTiN) · $122.90

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Download ISO 13399 data (.csv)

Proven in the field

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AlTiN

$122.90

SPS-503-16-030

Starting speeds & feeds for the SPS-503-16-030

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 SPS-503-16-030
MaterialOperationSFMRPMFeed (IPM)Chip load / toothDOC (in)WOC (in)
6AL-4V TitaniumRoughing — full slot2001,52813.8.00180.2500.5000
6AL-4V TitaniumFinishing2001,52813.8.00180.5000.0125
Gray IronRoughing — full slot5003,82061.1.00320.2500.5000
Gray IronFinishing5003,82061.1.00320.5000.0125
4140 SteelRoughing — full slot2201,68116.8.00200.2500.5000
4140 SteelFinishing2201,68116.8.00200.5000.0125

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 SPS-503 series

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