This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1120S, 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 SI40X1120S
The AirTAC Airtac SI40 Standard Cylinder SI40X1120S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1120S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1120S
- 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 SI40X1120S
The AirTAC SI40X1120S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1120mm stroke. Generating 628N push force at 0.5MPa, it features a G1/4 port, M12x1.25 rod thread, and adjustable air cushions. The direct replacement is the SAI40X1120S, matching the bore, stroke, force, port, and ISO 15552 mounting interface exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X1120S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1120S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1120S |
| Bore size | Ø40 mm |
| Stroke | 1120 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 SAI40X1120S 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 SAI40X1120S 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 SI40X1120S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1120 | 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 SI40X1120S Is Used
Long-Stroke Diversion
Pushes packages across a 1.1-meter conveyor lane using the 628N force class, relying on the adjustable cushion to decelerate the rod at end of travel.
Automated Door Actuation
Opens large industrial access doors or safety guards, using the G1/4 port and ISO 15552 mounting for rigid fixture integration.
Replacing the Airtac SI40 Standard Cylinder SI40X1120S with the SAI40X1120S
To replace the SI40X1120S, order the SAI40X1120S direct, confirming the ISO 15552 mounting interface, G1/4 port, and -S magnet. For sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. A plain cylinder drifts on air loss as cushions only decelerate; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. With a 1120mm stroke, prevent rod bending by using external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1120S
- ✓ 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 SI40X1120S FAQ
Yes, the SI40X1120S is discontinued. The direct replacement is the SAI40X1120S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 1120mm stroke, 628N force, G1/4 port, and mounting interface.
The 40mm bore uses a G1/4 port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, at 0.9MPa it is 1130N, and the theoretical maximum is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1120S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1120S replacement — usually within 7-8 hours.