This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X290S, 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 SI50X290S
The AirTAC Airtac SI50 Standard Cylinder SI50X290S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 290mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X290S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke290 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X290S
- 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 SI50X290S
The AirTAC SI50X290S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 290mm stroke, and a G1/4 air port. Generating 982N push force at 0.5MPa, it is replaced by the SAI50X290S. This direct upgrade maintains identical mounting, force, and port dimensions, fitting existing fixtures seamlessly.
The SAI replacement upgrades longevity with two Y-shaped one-way piston seals for low start-up pressure. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. For high heat, Viton H seals extend operation to 150C.
Airtac SI50 Standard Cylinder SI50X290S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X290S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X290S |
| Bore size | Ø50 mm |
| Stroke | 290 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 SAI50X290S 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 SAI50X290S 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 SI50X290S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×290 | 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 SI50X290S Is Used
Package Diversion
Actuates sorting gates on packaging lines where the 982N push force easily redirects standard weight cartons.
Pallet Handling
Drives stops and lifts within automated storage systems, utilizing the 290mm stroke for elevated positioning.
Replacing the Airtac SI50 Standard Cylinder SI50X290S with the SAI50X290S
To replace the SI50X290S, order the SAI50X290S. Verify the ISO 15552 mounting interface, 50mm bore, 290mm stroke, G1/4 port (PT/G/NPT), and the -S magnet. At 0.5MPa it yields 982N push and 825N pull; stepping up to the 63mm bore provides 1559N. At 290mm stroke, ensure guide alignment to prevent rod-bending side loads. Standard cylinders drift on air loss; for load holding, use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X290S
- ✓ 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 SI50X290S FAQ
Yes, the SI50X290S is discontinued. The direct replacement is the SAI50X290S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 290mm stroke, force, G1/4 port, and mounting accessories.
It has a G1/4 air port. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X290S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X290S replacement — usually within 7-8 hours.