This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X475S, 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 SI50X475S
The AirTAC Airtac SI50 Standard Cylinder SI50X475S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 475mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X475S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke475 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X475S
- 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 SI50X475S
The AirTAC SI50X475S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 475mm stroke. Delivering 982 N push at 0.5 MPa through a G1/4 port, it is directly replaced by the SAI50X475S. This direct upgrade matches the original ISO 15552 mounting interface, bore, stroke, force, and port size exactly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B switches, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X475S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X475S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X475S |
| Bore size | Ø50 mm |
| Stroke | 475 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 SAI50X475S 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 SAI50X475S 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 SI50X475S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×475 | 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 SI50X475S Is Used
Material Diversion
Actuates routing gates on package conveyors where the 982 N push force at 0.5 MPa easily pivots heavy diverters.
Long-Stroke Ejection
Pushes machined parts out of a fixture across a 475 mm gap, requiring external guides to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X475S with the SAI50X475S
To replace the SI50X475S, order the SAI50X475S and confirm the ISO 15552 mounting interface, 50mm bore, 475mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The built-in magnet (-S) lets you use CS1-B/DS1-B switches. Sizing both ways: the neighboring 40mm bore yields 628 N push at 0.5 MPa, while the 63mm bore yields 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. Because the 475mm stroke is long, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X475S
- ✓ 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 SI50X475S FAQ
Yes, the SI50X475S is discontinued. The direct replacement is the SAI50X475S. It shares the same ISO 15552 mounting interface, 50mm bore, 475mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
It has a G1/4 air port. Force ratings are 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 SAI50X475S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X475S replacement — usually within 7-8 hours.