This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X880S, 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 SI40X880S
The AirTAC Airtac SI40 Standard Cylinder SI40X880S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 880mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X880S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke880 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X880S
- 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 SI40X880S
The AirTAC SI40X880S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 628 N push force at 0.5 MPa through its G1/4 port. AirTAC replaced this legacy unit with the SAI40X880S, a direct upgrade retaining the exact 40 mm bore, 880 mm stroke, M12x1.25 rod thread, and mounting interface.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for lower start-up pressure and extended life. Because the SI40X880S includes a magnet, it supports legacy CS1-B/DS1-B sensors, whereas the SAI replacement family uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X880S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X880S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X880S |
| Bore size | Ø40 mm |
| Stroke | 880 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 SAI40X880S 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 SAI40X880S 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 SI40X880S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×880 | 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 SI40X880S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 880 mm reach, relying on external guides to prevent rod bending during the extended cycle.
Pneumatic Stopper Gate
Acts as an extended-stop barrier on accumulation conveyors, decelerating gently via the 27 mm adjustable air cushions at both ends.
Replacing the Airtac SI40 Standard Cylinder SI40X880S with the SAI40X880S
To replace the SI40X880S, order the SAI40X880S and confirm the ISO 15552 mounting interface, 40 mm bore, 880 mm stroke, G1/4 port, and your specific mounting accessory (LB, FA, CA, TC, etc.). The SAI family also introduces lock and valve variants the SI lacked, such as the SAIL air-released lock, SAIF built-in 4M valve, and BSAI clamp-lock. A plain cylinder does not hold load without live air; the cushion only decelerates, so use SAIL, BSAI, or an external pilot check valve for holding. At 880 mm, this long stroke risks rod bending under side loads, so external guides are required. If downsizing, a 32 mm bore gives 402 N push at 0.5 MPa; if upsizing, a 50 mm bore yields 982 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X880S
- ✓ 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 SI40X880S FAQ
Yes, the SI40X880S is discontinued. The direct replacement is the AirTAC SAI40X880S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 880 mm stroke, 628 N force, G1/4 port, and mounting fixtures.
The 40 mm bore provides 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 maximum theoretical force of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, and the G1/4 port is fixed by the bore size.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X880S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X880S replacement — usually within 7-8 hours.