This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1040S, 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 SI50 Standard Cylinder SI50X1040S
The AirTAC Airtac SI50 Standard Cylinder SI50X1040S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1040mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1040S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1040 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1040S
- 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 SI50 Standard Cylinder SI50X1040S
The AirTAC SI50X1040S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1040mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X1040S, a direct upgrade retaining the exact bore, stroke, force, port and mounting interface.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked. The original CS1-B/DS1-B sensors are superseded by current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X1040S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1040S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1040S |
| Bore size | Ø50 mm |
| Stroke | 1040 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X1040S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X1040S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X1040S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1040 | 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 SI50 Standard Cylinder SI50X1040S Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts where a 1040mm extension is required to reach distant lanes.
Vertical Material Lift
Hoists palletized goods up to 50kg in mezzanine lifts, relying on the 982N thrust at 0.5MPa for steady elevation.
Automated Door Actuation
Opens large industrial machine guard doors, utilizing the full 1040mm travel to clear wide work zones safely.
Replacing the Airtac SI50 Standard Cylinder SI50X1040S with the SAI50X1040S
To replace the discontinued SI50X1040S, order the SAI50X1040S direct equivalent. Verify your ISO 15552 mounting interface, 50mm bore, 1040mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. Because this 1040mm stroke exceeds the 1200mm standard maximum, it requires careful handling: use external guides to prevent rod bending and side-load damage over such a long extension. If sizing down, a 40mm bore yields 628N at 0.5MPa; sizing up to 63mm provides 1559N. Note that a plain cylinder drifts on air loss as the cushion only decelerates. For load holding, specify the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1040S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X1040S FAQ
Yes, the SI50X1040S is discontinued. The direct replacement is the SAI50X1040S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1040mm stroke, 982N force, G1/4 port and mounting fixtures.
It features a G1/4 air port and M16x1.5 rod thread. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1040S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1040S replacement — usually within 7-8 hours.