This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X800SFA, 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 SI50X800SFA
The AirTAC Airtac SI50 Standard Cylinder SI50X800SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X800SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X800SFA
- 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 SI50X800SFA
The AirTAC SI50X800SFA is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke, FA flange mounting, and a piston magnet. Delivering 982 N push at 0.5 MPa through a G1/4 port, it is replaced by the SAI50X800SFA. This direct upgrade shares the exact ISO 15552 mounting interface, bore, and force, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants. Your -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X800SFA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X800SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X800SFA |
| Bore size | Ø50 mm |
| Stroke | 800 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 SAI50X800SFA 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 SAI50X800SFA 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 SI50X800SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×800 | 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 SI50X800SFA Is Used
Long-Stroke Diverting
Pushes packages across a 800 mm conveyor lane using the 982 N thrust class and FA flange mount.
Vertical Material Lift
Raises 50 kg loads through the full 800 mm travel, requiring external guides to prevent rod side-load bending.
Automated Door Actuation
Opens large machine guard doors over an 800 mm span, relying on the G1/4 port and ISO 15552 interface.
Replacing the Airtac SI50 Standard Cylinder SI50X800SFA with the SAI50X800SFA
To replace the SI50X800SFA, order the SAI50X800SFA. Verify the ISO 15552 FA flange interface, 50 mm bore, 800 mm stroke, G1/4 port, and the -S magnet. Sizing both ways: a 63 mm bore offers 1559 N push, while a 40 mm bore yields 628 N. Note that an 800 mm stroke requires external guides to prevent rod bending and side-load damage. The air cushion only decelerates; it does not hold load on air loss. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X800SFA
- ✓ 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 SI50X800SFA FAQ
Yes, the SI50X800SFA is discontinued. The direct replacement is the SAI50X800SFA, which shares the same ISO 15552 mounting interface, 50 mm bore, 800 mm stroke, force, G1/4 port, and FA flange.
It has a G1/4 port. Force ratings are 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 theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X800SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X800SFA replacement — usually within 7-8 hours.