This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X290SH, 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 SI50X290SH
The AirTAC SI50 Standard Cylinder SI50X290SH 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 SAI50X290SH, 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 → SAI50X290SH
- 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 SI50X290SH
The AirTAC SI50X290SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 290mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X290SH, matching the interface, force, and stroke.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The H suffix indicates Viton seals for 0-150C. The S magnet works with CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X290SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X290SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X290SH |
| 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 SAI50X290SH 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 SAI50X290SH 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 SI50X290SH
| 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 SI50X290SH Is Used
High-Temp Handling
The Viton H seal handles 0-150C environments, ideal for moving hot molded components out of presses.
Replacing the Airtac SI50 Standard Cylinder SI50X290SH with the SAI50X290SH
To replace the SI50X290SH, order the SAI50X290SH. Verify the ISO 15552 mounting interface, 50mm bore, 290mm stroke, G1/4 port, and magnet. Sizing options: a 40mm bore yields 628N [email protected], while a 63mm bore yields 1559N. At 290mm stroke, add external guides to prevent rod bending and side loads. A plain cylinder drifts on air loss; for load holding use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X290SH
- ✓ 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 SI50X290SH FAQ
Yes, the SI50X290SH is discontinued. The direct replacement is the SAI50X290SH. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 290mm stroke, 982N force, G1/4 port, and mounting fixtures.
This double-acting cylinder uses a G1/4 air port. Force ratings are: push 982N and pull 825N at 0.5MPa, push 1374N at 0.7MPa, push 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X290SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X290SH replacement — usually within 7-8 hours.