This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X500S, 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 SI50X500S
The AirTAC Airtac SI50 Standard Cylinder SI50X500S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X500S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X500S
- 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 SI50X500S
The AirTAC SI50X500S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 500 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this unit with the SAI50X500S, a direct upgrade retaining the exact ISO 15552 mounting interface, stroke, force, and porting.
The SAI upgrade features a refined piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors, while seal options include Viton H for high heat.
Airtac SI50 Standard Cylinder SI50X500S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X500S |
| Bore size | Ø50 mm |
| Stroke | 500 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 SAI50X500S 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 SAI50X500S 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 SI50X500S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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 SI50X500S Is Used
Long-Stroke Diversion
Pushes packages across a 500 mm transfer belt with 982 N force, relying on the adjustable end cushions to brake smoothly.
Vertical Lift Gate
Raises a 50 kg mezzanine access panel using the 0.5 MPa thrust, requiring an external pilot check valve to prevent drifting on air loss.
Component Ejection
Clears machined parts from a fixture over a 500 mm distance, using the built-in magnet and CS1-B sensor to confirm full extension.
Replacing the Airtac SI50 Standard Cylinder SI50X500S with the SAI50X500S
To replace the SI50X500S, order the SAI50X500S. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT, G, or NPT), and the magnet requirement. The 50 mm bore yields 982 N push at 0.5 MPa; sizing down to 40 mm drops force to 628 N, while sizing up to 63 mm increases it to 1559 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use the SAIL or BSAI lock variant, or an external pilot check valve for load holding. At 500 mm, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X500S
- ✓ 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 SI50X500S FAQ
Yes, the SI50X500S is discontinued. The direct replacement is the SAI50X500S. It shares the identical ISO 15552 mounting interface, 50 mm bore, 500 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port feeds a 50 mm bore yielding 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The 500 mm stroke operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X500S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X500S replacement — usually within 7-8 hours.