This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X580S, 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 SI50X580S
The AirTAC SI50 Standard Cylinder SI50X580S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 580mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X580S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke580 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X580S
- 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 SI50X580S
The AirTAC SI50X580S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 580mm stroke, and a G1/4 air port. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50X580S. This direct upgrade matches the exact ISO 15552 mounting interface, bore, stroke, output force, and port size to fit existing fixtures.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the legacy line. Your SI50X580S includes a piston magnet for CS1-B/DS1-B switches, though the SAI replacement uses current AirTAC sensors.
Airtac SI50 Standard Cylinder SI50X580S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X580S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X580S |
| Bore size | Ø50 mm |
| Stroke | 580 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 SAI50X580S 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 SAI50X580S 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 SI50X580S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×580 | 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 SI50X580S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 580mm stroke, relying on the 982N force at 0.5MPa to shift loads smoothly between conveyor belts.
Extended Tool Actuation
Drives tooling carriages or clamping arms over extended distances where a 50mm bore provides sufficient thrust without consuming excessive space.
Replacing the Airtac SI50 Standard Cylinder SI50X580S with the SAI50X580S
To replace the SI50X580S, order the SAI50X580S direct equivalent, verifying the ISO 15552 mounting interface, 50mm bore, 580mm stroke, G1/4 port, and your specific mounting accessory. The -S suffix confirms a piston magnet for legacy CS1-B/DS1-B sensors; the SAI replacement uses current AirTAC switches. When sizing, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore provides 1559N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 580mm stroke is long, prevent rod bending by ensuring external guides handle side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X580S
- ✓ 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 SI50X580S FAQ
Yes, the SI50X580S is discontinued. The direct replacement is the SAI50X580S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 580mm stroke, output force, G1/4 port, and mounting interface for a seamless fixture swap.
The 50mm bore uses a G1/4 air port. At 0.5MPa it provides 982N push and 825N pull force. At 0.7MPa the push force is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X580S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X580S replacement — usually within 7-8 hours.