This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X980S, 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 SI50X980S
The AirTAC Airtac SI50 Standard Cylinder SI50X980S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 980mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X980S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke980 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X980S
- 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 SI50X980S
The AirTAC SI50X980S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 980 mm stroke. Delivering 982 N push and 825 N pull at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X980S. This direct upgrade maintains the exact ISO 15552 mounting interface, bore, stroke, force, and accessories.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For applications needing load holding on air loss, the SAI family adds SAIL and BSAI lock variants the SI lacked. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X980S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X980S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X980S |
| Bore size | Ø50 mm |
| Stroke | 980 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 SAI50X980S 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 SAI50X980S 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 SI50X980S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×980 | 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 SI50X980S Is Used
Long-Stroke Diversion
Pushes packages across a 980 mm transfer lane with 982 N of force at 0.5 MPa, requiring external guides to prevent rod bending over the extended length.
Material Ejection
Cycles at 30-800 mm/s to eject machined profiles, using the built-in magnet with CS1-B/DS1-B switches to confirm full extension before the next cycle.
Replacing the Airtac SI50 Standard Cylinder SI50X980S with the SAI50X980S
To replace the SI50X980S, order the SAI50X980S, confirming the ISO 15552 interface, 50 mm bore, 980 mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The SAI is dimensionally interchangeable per ISO 15552 and drops into existing fixtures. Sizing both ways: a 63 mm bore offers 1559 N push at 0.5 MPa, while a 40 mm bore provides 628 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 980 mm stroke is long, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X980S
- ✓ 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 SI50X980S FAQ
Yes, the SI50X980S is discontinued. The direct replacement is the SAI50X980S. It shares the identical ISO 15552 mounting interface, 50 mm bore, 980 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while upgrading the piston seal.
It features a G1/4 air port and provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The 980 mm stroke operates at 30-800 mm/s with a 30 mm adjustable air cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X980S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X980S replacement — usually within 7-8 hours.