This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX500S, 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 SI50AX500S
The AirTAC Airtac SI50 Standard Cylinder SI50AX500S 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 SAI50AX500S, 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 → SAI50AX500S
- 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 SI50AX500S
The AirTAC SI50AX500S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 500mm stroke. It delivers 982N push force at 0.5MPa. The direct replacement is SAI50AX500S, keeping the same interface, G1/4 port, and M16x1.5 rod thread.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. This -A variant has a SUS420J2 rod, -S magnet for CS1-B/DS1-B sensors, and Viton H option for 150C.
Airtac SI50 Standard Cylinder SI50AX500S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX500S |
| 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 SAI50AX500S 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 SAI50AX500S 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 SI50AX500S
| 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 SI50AX500S Is Used
Long-Stroke Diversion
Pushes packages across a 500mm transfer gap with 982N force, relying on the adjustable cushion to decelerate the rod smoothly.
Vertical Lift Gate
Raises a 50kg access panel using the SUS420J2 stainless rod to resist humidity, requiring a pilot check valve to hold the load.
Multi-Stage Ejection
Clears machined aluminum parts from a fixture over a 500mm distance, matching the G1/4 port to existing facility valves.
Replacing the Airtac SI50 Standard Cylinder SI50AX500S with the SAI50AX500S
To replace the SI50AX500S, order SAI50AX500S to match the ISO 15552 mounting, 50mm bore, 500mm stroke, G1/4 port, and SUS420J2 rod. At 0.5MPa it yields 982N push; sizing down, a 40mm bore gives 628N. For load holding, note the cushion only decelerates; use SAIL or BSAI lock variants. With a 500mm stroke, use external guides to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX500S
- ✓ 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 SI50AX500S FAQ
Yes, the SI50AX500S is discontinued. The direct replacement is SAI50AX500S, which is dimensionally interchangeable per ISO 15552 and shares the same 50mm bore, 500mm stroke, force, and G1/4 port.
It features a G1/4 air port. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX500S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX500S replacement — usually within 7-8 hours.