This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X520SN, 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 SI50X520SN
The AirTAC Airtac SI50 Standard Cylinder SI50X520SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 520mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X520SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke520 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X520SN
- 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 SI50X520SN
The AirTAC SI50X520SN is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 520 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X520SN, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -SN variant includes a piston magnet for CS1-B/DS1-B switches and NBR seals (-20 to +70 C; Viton H raises this to 150 C).
Airtac SI50 Standard Cylinder SI50X520SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X520SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X520SN |
| Bore size | Ø50 mm |
| Stroke | 520 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 SAI50X520SN 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 SAI50X520SN 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 SI50X520SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×520 | 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 SI50X520SN Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 520 mm reach, utilizing the 982 N force at 0.5 MPa to overcome guide friction.
Pneumatic Press Ejection
Cycles parts out of a press bed using the 1374 N push force at 0.7 MPa, with adjustable 30 mm cushions absorbing end-of-stroke impact.
Replacing the Airtac SI50 Standard Cylinder SI50X520SN with the SAI50X520SN
To replace the SI50X520SN, order the SAI50X520SN. It drops directly into existing fixtures via the ISO 15552 mounting interface, matching the 50 mm bore, 520 mm stroke, G1/4 port, and M16x1.5 rod thread. If you need more force, the neighboring 63 mm bore yields 1559 N push at 0.5 MPa; if less is required, the 40 mm bore gives 628 N. Because this is a 520 mm stroke, use an external guide to prevent rod-bending and side-load damage. 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. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X520SN
- ✓ 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 SI50X520SN FAQ
Yes, the SI50X520SN is discontinued. The direct replacement is the SAI50X520SN. It shares the identical ISO 15552 mounting interface, 50 mm bore, 520 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port feeds a 50 mm bore generating 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X520SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X520SN replacement — usually within 7-8 hours.