This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1090S, 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 SI40X1090S
The AirTAC Airtac SI40 Standard Cylinder SI40X1090S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1090mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1090S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1090 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1090S
- 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 SI40X1090S
The AirTAC SI40X1090S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1090mm stroke, delivering 628 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI40X1090S, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X1090S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1090S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1090S |
| Bore size | Ø40 mm |
| Stroke | 1090 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 SAI40X1090S 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 SAI40X1090S 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 SI40X1090S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1090 | 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 SI40X1090S Is Used
Long-Stroke Transfer
Pushes workpieces between automated machining stations over a 1090mm travel distance.
High-Reach Diverting
Actuates routing gates on elevated sortation conveyors where a 628 N push force is sufficient.
Elevated Lowering
Controls the gravity descent of light pallets, relying on the adjustable 27mm cushion for end-of-stroke deceleration.
Replacing the Airtac SI40 Standard Cylinder SI40X1090S with the SAI40X1090S
To replace this SI40X1090S, order the SAI40X1090S keeping the identical 40mm bore, 1090mm stroke, -S magnet for CS1-B/DS1-B sensors, and G1/4 port. Because the 1090mm stroke is long, use external guides to prevent rod bending and side-load damage. If you need more force, the neighbouring 50mm bore yields 982 N push at 0.5 MPa; if less is needed, the 32mm bore gives 402 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify the SAIL lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1090S
- ✓ 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 SI40X1090S FAQ
Yes, the SI40X1090S is discontinued. The direct replacement is the SAI40X1090S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 1090mm stroke, G1/4 port, and mounting fixtures.
This double-acting 40mm bore cylinder features a G1/4 air port. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1090S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1090S replacement — usually within 7-8 hours.