This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X365S, 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 SI50X365S
The AirTAC Airtac SI50 Standard Cylinder SI50X365S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 365mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X365S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke365 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X365S
- 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 SI50X365S
The AirTAC SI50X365S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 365mm stroke. Delivering 982 N push and 825 N pull at 0.5 MPa, it is replaced by the SAI50X365S. This direct upgrade keeps the same G1/4 port, M16x1.5 rod thread, and mounting interface, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure and long life. The SI50X365S includes a magnet for CS1-B/DS1-B sensors; SAI uses current switches. If you need load holding, note the cushion only decelerates—use SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X365S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X365S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X365S |
| Bore size | Ø50 mm |
| Stroke | 365 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 SAI50X365S 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 SAI50X365S 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 SI50X365S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×365 | 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 SI50X365S Is Used
Package Diverting
Drives diverter arms on sorting lines, using the 365mm stroke to push parcels cleanly between adjacent conveyor belts.
Pallet Stopping
Acts as a pneumatic stop gate for incoming pallets, absorbing kinetic energy via the 30mm adjustable air cushions at both ends.
Replacing the Airtac SI50 Standard Cylinder SI50X365S with the SAI50X365S
To replace the SI50X365S, order the SAI50X365S. Confirm the ISO 15552 mounting interface, 50mm bore, 365mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S denotes a piston magnet for CS1-B/DS1-B sensors (the SAI takes current AirTAC switches). For sizing both ways: a 40mm bore gives 628 N [email protected], while a 63mm bore yields 1559 N. At 365mm stroke, prevent rod bending by guiding the load externally. A plain cylinder drifts on air loss; for held loads use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X365S
- ✓ 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 SI50X365S FAQ
Yes, the SI50X365S is discontinued. The direct replacement is the SAI50X365S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 365mm stroke, output force, G1/4 port, and mounting accessories.
The bore is 50mm with a G1/4 air port and M16x1.5 rod thread. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X365S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X365S replacement — usually within 7-8 hours.