End MillMade in USA

SPS-503-24-BN

Name: RobbJack SPS-503-24-BN — SPS Super Python — 5 Flute Variable Helix Standard Length Tuffy Grade Carbide End Mill
Brand: RobbJack
SKU: SPS-503-24-BN
Price: 252.05 USD
Availability: MadeToOrder

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 40 HRc. 0.75-in Dia 5-Flute End Mill, 1.625-in LOC, 0.75-in Shank, 4-in OAL, 0.375 CR

Scaled drawing — true to this tool's dimensions (inch)

Speeds & FeedsDialed to this exact tool — free

Free CAD & DataSTEP 3D DXF 2D ISO CSV CAM 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 40 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** — 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** — 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 40 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 40 HRc

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC: 0.75″
Shank DiameterDMM: 0.75″
Length of Cut (LOC)APMX: 1.625″
Overall Length (OAL)OAL: 4″
Corner RadiusRE: 0.375″
Number of FlutesNOF: 5
Helix AngleFHA: Variable
End Type: Ball End
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