This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X150S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40X150S
The AirTAC Airtac SI40 Standard Cylinder SI40X150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X150S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI40 Standard Cylinder SI40X150S
The AirTAC SI40X150S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 150mm stroke. Delivering 628N push at 0.5MPa via a G1/4 port, it is replaced by the SAI40X150S. This direct upgrade shares identical ISO 15552 mounting dimensions, force, and accessories.
The SAI features upgraded two Y-shaped one-way piston seals for low start-up pressure. The -S magnet works with CS1-B/DS1-B switches, while SAIL/BSAI lock variants the SI lacked are now available.
Airtac SI40 Standard Cylinder SI40X150S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X150S |
| Bore size | Ø40 mm |
| Stroke | 150 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X150S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40X150S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40X150S Is Used
Package Diversion
Pushes lightweight cartons on packaging lines using the 628N push force, with the G1/4 port ensuring rapid actuation.
Small Part Ejection
Ejects machined components from fixtures where a 32kg vertical lift capacity and 150mm travel are required.
Sorter Gating
Operates routing gates in distribution hubs, utilizing the ISO 15552 mounting for straightforward fixture integration.
Replacing the Airtac SI40 Standard Cylinder SI40X150S with the SAI40X150S
To replace the SI40X150S, order the SAI40X150S. Confirm the ISO 15552 interface, 40mm bore, 150mm stroke, G1/4 port (PT/G/NPT), and mounting. The -S magnet enables CS1-B/DS1-B sensors. For sizing, the 50mm bore yields 982N push at 0.5MPa, while the 32mm bore yields 402N. A plain cylinder drifts on air loss—cushions only decelerate—so use an external rod lock or pilot check valve for holding, or specify SAIL/BSAI. At 150mm stroke, guide rods prevent side-load rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X150S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X150S FAQ
Yes, the SI40X150S is discontinued. The direct replacement is the SAI40X150S. It shares the same ISO 15552 mounting interface, 40mm bore, 150mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 air port. Force ratings are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X150S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X150S replacement — usually within 7-8 hours.