SPS-401-32-190
SPS Super Python — 4 Flute Variable Helix Stub 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. 1-in Dia 4-Flute End Mill, 1.25-in LOC, 1-in Shank, 4-in OAL, 0.19 CR
OrderingSPS-401-32-190·Aluminum Titanium Nitride (AlTiN)·$557.25
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.
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
- 1″
- Shank DiameterDMM
- 1″
- Length of Cut (LOC)APMX
- 1.25″
- Overall Length (OAL)OAL
- 4″
- Corner RadiusRE
- 0.19″
- Number of FlutesNOF
- 4
- Helix AngleFHA
- Variable
- End Type
- Corner Radius
- Center Cutting
- Yes — plunges
- Shank Flats
- Available (-FL)
- Series
- SPS-401 — SPS Super Python — 4 Flute Variable Helix Stub Length Tuffy Grade Carbide End Mill
Cuts these materials
Applications
See it run · 2 videos
Choose the finish(1 option)
Compare →Each finish is a different part number and price.
Part SPS-401-32-190
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-401-32-190 · Aluminum Titanium Nitride (AlTiN) · $557.25
AlTiN
$557.25
SPS-401-32-190
Starting speeds & feeds for the SPS-401-32-190
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.
| Material | Operation | SFM | RPM | Feed (IPM) | Chip load / tooth | DOC (in) | WOC (in) |
|---|---|---|---|---|---|---|---|
| 6AL-4V Titanium | Roughing — full slot | 200 | 764 | 7.6 | .00250 | .7000 | 1.0000 |
| 6AL-4V Titanium | Finishing | 200 | 764 | 7.6 | .00250 | 1.2500 | .0250 |
| Gray Iron | Roughing — full slot | 525 | 2,006 | 36.1 | .00450 | .6648 | 1.0000 |
| Gray Iron | Finishing | 525 | 2,006 | 36.1 | .00450 | 1.2500 | .0250 |
| 4140 Steel | Roughing — full slot | 400 | 1,528 | 17.1 | .00280 | .7000 | 1.0000 |
| 4140 Steel | Finishing | 400 | 1,528 | 17.1 | .00280 | 1.2500 | .0250 |
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-401 series
Same series, different size — what changes from this tool is shown in red.
- SPS-401-08-010$57.95Ø 0.25″LOC 0.5″CR 0.01″OAL 2.5″
- SPS-401-08-030$57.95Ø 0.25″LOC 0.5″CR 0.03″OAL 2.5″
- SPS-401-08-060$57.95Ø 0.25″LOC 0.5″CR 0.06″OAL 2.5″
- SPS-401-08-BN$61.90Ø 0.25″LOC 0.5″CR 0.125″OAL 2.5″
- SPS-401-12-010$69.00Ø 0.375″LOC 0.5″CR 0.01″OAL 2.5″
- SPS-401-12-030$69.00Ø 0.375″LOC 0.5″CR 0.03″OAL 2.5″
- SPS-401-12-060$70.55Ø 0.375″LOC 0.5″CR 0.06″OAL 2.5″
- SPS-401-12-120$77.00Ø 0.375″LOC 0.5″CR 0.12″OAL 2.5″
- SPS-401-12-BN$82.15Ø 0.375″LOC 0.5″CR 0.1875″OAL 2.5″
- SPS-401-16-010$114.95Ø 0.5″LOC 0.625″CR 0.01″OAL 3″
- SPS-401-16-030$114.95Ø 0.5″LOC 0.625″CR 0.03″OAL 3″
- SPS-401-16-060$116.50Ø 0.5″LOC 0.625″CR 0.06″OAL 3″