This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1100S, 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 SI40X1100S
The AirTAC Airtac SI40 Standard Cylinder SI40X1100S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1100S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1100S
- 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 SI40X1100S
The AirTAC SI40X1100S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1100mm stroke. Delivering 628 N push force at 0.5 MPa, it features a G1/4 port, M12x1.25 rod thread, and a piston magnet for CS1-B/DS1-B sensors. AirTAC replaced this legacy unit with the SAI40X1100S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40X1100S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1100S |
| Bore size | Ø40 mm |
| Stroke | 1100 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 SAI40X1100S 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 SAI40X1100S 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 SI40X1100S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1100 | 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 SI40X1100S Is Used
Long-Stroke Diversion
Pushes packages across a 1.1-meter conveyor lane using the 628 N push force at 0.5 MPa, requiring external guides to prevent rod bending over the extended travel.
Vertical Material Lift
Raises lightweight pallets up to 32 kg through a 1100mm vertical path, relying on a pilot check valve to hold the load safely if air pressure drops.
Pneumatic Slide Transfer
Moves workpieces between processing stations on a profile-barrel ISO 15552 body, using adjustable 27mm air cushions at both ends to decelerate the 1100mm travel.
Replacing the Airtac SI40 Standard Cylinder SI40X1100S with the SAI40X1100S
To replace the SI40X1100S, order the SAI40X1100S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/4 port thread, and the -S magnet requirement. Because this is a 1100mm long stroke, prevent rod bending by guiding the load externally to avoid side-load damage. A standard cylinder drifts without live air; for load holding on pressure loss, use an external pilot check valve or the SAIL/BSAI lock variant. If downsizing, a 32mm bore offers 402 N push at 0.5 MPa; if upsizing, a 50mm bore provides 982 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1100S
- ✓ 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 SI40X1100S FAQ
Yes, the SI40X1100S is discontinued. The direct replacement is the AirTAC SAI40X1100S. It shares the identical ISO 15552 mounting interface, 40mm bore, 1100mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
The 40mm bore features a G1/4 port and M12x1.25 rod thread. 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 maximum of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1100S replacement — usually within 7-8 hours.