This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X580, 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 SI50X580
The AirTAC Airtac SI50 Standard Cylinder SI50X580 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 SAI50X580, 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 → SAI50X580
- 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 SI50X580
The AirTAC SI50X580 is a discontinued double-acting ISO 15552 profile cylinder delivering 982 N push at 0.5 MPa through a 50 mm bore and 580 mm stroke. It features a G1/4 port and adjustable air cushions. AirTAC replaced it with the SAI50X580, a direct upgrade retaining the exact interface, force, and mounts.
The SAI upgrade uses two Y-shaped one-way piston seals for lower start-up pressure and longer life. This non-magnet SKU cannot take a sensor, unlike legacy CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X580 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X580 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X580 |
| 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 SAI50X580 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 SAI50X580 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 SI50X580
| 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 SI50X580 Is Used
Long-Stroke Diversion
Pushes packages across a 580 mm transfer gap with 982 N push force at 0.5 MPa, requiring external guides to prevent rod bending.
Material Ejection
Cycles at 30-800 mm/s to eject formed parts from a press, relying on the 30 mm adjustable air cushions for end-of-stroke deceleration.
Replacing the Airtac SI50 Standard Cylinder SI50X580 with the SAI50X580
To replace the SI50X580, order the SAI50X580 and verify your ISO 15552 mounting, G1/4 port, and M16x1.5 rod thread. Sizing both ways: a 63 mm bore offers 1559 N push at 0.5 MPa, while a 40 mm bore yields 628 N. Because this is a 580 mm stroke, use external guides to prevent rod bending and side-load damage. The air cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants. This SKU lacks a magnet, so it cannot accept position switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X580
- ✓ 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 SI50X580 FAQ
Yes, the SI50X580 is discontinued. The direct replacement is the SAI50X580. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 580 mm stroke, G1/4 port, and mounting interface.
The G1/4 port bore delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a 200 kgf maximum at 1.0 MPa. The SAI upgrade adds Y-shaped seals for lower start-up pressure.
Request a Quote for the SAI50X580
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X580 replacement — usually within 7-8 hours.