This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1220S, 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 SI40X1220S
The AirTAC Airtac SI40 Standard Cylinder SI40X1220S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1220mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1220S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1220 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1220S
- 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 SI40X1220S
The AirTAC SI40X1220S is a discontinued double-acting ISO 15552 profile cylinder. Built with an extruded aluminum barrel, it delivers 628 N push force at 0.5 MPa through a 40 mm bore and G1/4 port. Because this 1220 mm stroke exceeds the 1200 mm standard maximum, it was produced as a non-standard, made-to-order unit. AirTAC replaced this legacy unit with the SAI40X1220S.
The SAI40X1220S is a direct replacement, matching the exact ISO 15552 mounting interface, bore, stroke, output force, and port size. The upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For applications needing load holding, the SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X1220S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1220S |
| Bore size | Ø40 mm |
| Stroke | 1220 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 SAI40X1220S 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 SAI40X1220S 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 SI40X1220S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1220 | 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 SI40X1220S Is Used
Long-Reach Diverting
Drives diverter arms across wide conveyor belts over the 1220 mm stroke, providing 628 N push at 0.5 MPa to redirect heavy cartons.
Automated Door Actuation
Opens and closes large industrial machinery access doors, relying on the 27 mm adjustable air cushions to decelerate the extended travel smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40X1220S with the SAI40X1220S
To replace the SI40X1220S, order the SAI40X1220S. Confirm the ISO 15552 mounting interface, the G1/4 port, the M12x1.25 rod thread, and the -S magnet for legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Because the 1220 mm stroke exceeds the 1200 mm standard, it remains a made-to-order item. At 1220 mm, the 16 mm rod is highly susceptible to side-load and bending; always use an external guide to prevent premature seal failure. If sizing down, a 32 mm bore offers 402 N push at 0.5 MPa; if sizing up, a 50 mm bore provides 982 N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For secure holding, use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1220S
- ✓ 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 SI40X1220S FAQ
Yes, the SI40X1220S is discontinued. The direct replacement is the AirTAC SAI40X1220S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 1220 mm stroke, G1/4 port, and mounting interface, so it fits existing fixtures directly.
This double-acting cylinder operates at 0.15-1.0 MPa (proof 1.5 MPa) with a speed range of 30-800 mm/s. Force output is 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. It uses a G1/4 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1220S replacement — usually within 7-8 hours.