This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X920S, 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 SI40X920S
The AirTAC Airtac SI40 Standard Cylinder SI40X920S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 920mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X920S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke920 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X920S
- 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 SI40X920S
The AirTAC SI40X920S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 920 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X920S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI40X920S features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants the SI line lacked. Your -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X920S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X920S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X920S |
| Bore size | Ø40 mm |
| Stroke | 920 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 SAI40X920S 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 SAI40X920S 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 SI40X920S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×920 | 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 SI40X920S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 920 mm travel, relying on external guides to prevent rod bending during the extended reach.
Pneumatic Stopper Gate
Acts as a 40 mm bore physical stop barrier on assembly tracks, providing 628 N of push force at 0.5 MPa to halt moving workpieces.
Replacing the Airtac SI40 Standard Cylinder SI40X920S with the SAI40X920S
To replace the discontinued SI40X920S, order the SAI40X920S. Confirm the ISO 15552 mounting interface, 920 mm stroke, G1/4 port, and your mounting accessory (LB, FA, TC, etc.). The -S magnet means it accepts CS1-B/DS1-B switches, though the SAI replacement uses current AirTAC sensors. For sizing both ways, a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. Because this is a 920 mm stroke, prevent rod bending by supporting the load with external guides to avoid side-loading. A plain cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X920S
- ✓ 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 SI40X920S FAQ
Yes, the SI40X920S is discontinued. The direct replacement is the SAI40X920S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 920 mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/4 air port. The thrust ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X920S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X920S replacement — usually within 7-8 hours.