This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X800S, 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 SI50X800S
The AirTAC Airtac SI50 Standard Cylinder SI50X800S 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 SAI50X800S, 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 → SAI50X800S
- 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 SI50X800S
The AirTAC SI50X800S is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke, delivering 982 N push force at 0.5 MPa. AirTAC replaced it with the SAI50X800S. This direct upgrade retains the exact bore, stroke, G1/4 port and ISO 15552 mounting interface, dropping straight into existing fixtures.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds lock and valve variants (SAIL, SAIF, BSAI) absent in the SI line. Your -S suffix means a piston magnet for CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X800S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X800S |
| 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 SAI50X800S 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 SAI50X800S 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 SI50X800S
| 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 SI50X800S Is Used
Long-Stroke Material Push
Ideal for diverting larger packages across a wide conveyor belt using its 800 mm travel and 982 N push force at 0.5 MPa.
Pallet Denester
Extracts empty pallets from vertical magazines, requiring the extended stroke length and stable ISO 15552 profile mounting.
Elevator Lowering Gate
Actuates heavy safety gates on freight elevators, where the 50 kg vertical lift capacity and adjustable cushions manage the descent.
Replacing the Airtac SI50 Standard Cylinder SI50X800S with the SAI50X800S
To replace the SI50X800S, order the SAI50X800S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT, G or NPT), and the magnet requirement. The 800 mm stroke demands external guides to prevent rod bending and side-load wear. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; if undersized, the 63 mm bore offers 1559 N. Note that a standard cylinder drifts on air loss—the cushion only decelerates. For load holding, specify the SAIL lock variant or an external pilot check valve. The SAI family also offers the SAIF integrated valve and BSAI clamp-lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X800S
- ✓ 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 SI50X800S FAQ
Yes, the SI50X800S is discontinued. The direct replacement is the AirTAC SAI50X800S. It features the same ISO 15552 mounting interface, 50 mm bore, 800 mm stroke, output force, and G1/4 port, so it fits your existing fixtures perfectly.
This double-acting cylinder operates at 0.15-1.0 MPa (proof 1.5 MPa) with a speed of 30-800 mm/s. 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. It has a 20 mm rod, M16x1.5 thread, and 30 mm cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X800S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X800S replacement — usually within 7-8 hours.