This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX90S, 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 SI40AX90S
The AirTAC SI40 Standard Cylinder SI40AX90S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 90mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX90S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke90 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX90S
- 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 SI40AX90S
The AirTAC SI40AX90S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 90mm stroke, and a SUS420J2 stainless steel piston rod. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX90S. This direct upgrade retains identical mounting, stroke, and force specs, but adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
The original -S magnet supports legacy CS1-B/DS1-B switches, while the SAI replacement uses current AirTAC sensors. Note that standard cylinders drift without live air; for load holding, explore the SAIL or BSAI lock variants instead of relying on the 27mm adjustable air cushions.
Airtac SI40 Standard Cylinder SI40AX90S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX90S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX90S |
| Bore size | Ø40 mm |
| Stroke | 90 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 SAI40AX90S 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 SAI40AX90S 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 SI40AX90S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×90 | 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 SI40AX90S Is Used
Stainless Rod Clamping
Ideal for packaging fixtures requiring corrosion resistance, using the SUS420J2 rod to secure components with 628N push force.
Transfer Line Diverter
Deploys the 90mm stroke to push products between conveyor lanes, utilizing the G1/4 port for rapid 30-800 mm/s actuation.
Replacing the Airtac SI40 Standard Cylinder SI40AX90S with the SAI40AX90S
To replace the discontinued SI40AX90S, order the SAI40AX90S, ensuring a true ISO 15552 direct match for bore, stroke, G1/4 port, and mounting. Confirm the SUS420J2 stainless rod (-A) and the magnet (-S) for sensor tracking. The 40mm bore yields 628N push at 0.5MPa; if undersizing, a 32mm bore offers 402N, and if oversizing, a 50mm bore provides 982N. For load holding on air loss, do not depend on the cushions; add an external pilot check valve or use the SAIL/BSAI lock variants. With a 90mm stroke, side-load risks are minimal, but always verify rod alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX90S
- ✓ 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 SI40AX90S FAQ
Yes, the SI40AX90S is discontinued. The direct replacement is the SAI40AX90S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 90mm stroke, force, G1/4 port, and mounting interface.
It features a G1/4 air port and provides 628N push and 528N pull at 0.5 MPa. At 0.7 MPa push is 879N, at 0.9 MPa it is 1130N, and the theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX90S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX90S replacement — usually within 7-8 hours.