This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X800, 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 SI50X800
The AirTAC SI50 Standard Cylinder SI50X800 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 SAI50X800, 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 → SAI50X800
- 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 SI50X800
The AirTAC SI50X800 is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke. Delivering 982 N push force at 0.5 MPa through a G1/4 port, it is directly replaced by the SAI50X800. This direct upgrade shares the exact ISO 15552 mounting interface, bore, and cushioning, fitting existing fixtures perfectly.
The SAI50X800 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor, and the SAI family adds SAIL lock and SAIF valve variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X800 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X800 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X800 |
| 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 SAI50X800 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 SAI50X800 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 SI50X800
| 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 SI50X800 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 800 mm travel, relying on the 982 N push force at 0.5 MPa to overcome guide friction.
Automated Press Ejection
Ejects formed parts from machinery beds, utilizing the adjustable 30 mm air cushions at both ends to decelerate the 800 mm travel safely.
Replacing the Airtac SI50 Standard Cylinder SI50X800 with the SAI50X800
To replace the SI50X800, order the SAI50X800. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors; choose SAI50X800S if position sensing is required. Sizing both ways: the 50 mm bore yields 982 N push at 0.5 MPa, while the neighbouring 63 mm bore offers 1559 N. For load holding on air loss, note the cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variant. At 800 mm stroke, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X800
- ✓ 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 SI50X800 FAQ
Yes, the SI50X800 is discontinued. The direct replacement is the SAI50X800. It is dimensionally interchangeable per the ISO 15552 mounting interface, maintaining the same 50 mm bore, 800 mm stroke, G1/4 port, and output force.
The bore is 50 mm with a G1/4 air port. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X800
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X800 replacement — usually within 7-8 hours.