This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X800SN, 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 SI50X800SN
The AirTAC Airtac SI50 Standard Cylinder SI50X800SN 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 SAI50X800SN, 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 → SAI50X800SN
- 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 SI50X800SN
The AirTAC SI50X800SN is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke and NBR seals. Built for a 50 mm bore, it generates 982 N push force at 0.5 MPa and features a G1/4 port. AirTAC replaced this legacy unit with the SAI50X800SN, a direct upgrade retaining the exact ISO 15552 mounting interface, stroke, and output force.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. For applications needing load holding, the SAI family adds SAIL and BSAI lock variants the SI lacked. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X800SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X800SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X800SN |
| 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 SAI50X800SN 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 SAI50X800SN 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 SI50X800SN
| 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 SI50X800SN Is Used
Long-Stroke Material Push
Uses the full 800 mm travel to transfer products between parallel conveyor lines without adding intermediate actuators.
Blanking Line Ejector
Ejects stamped parts from a press bed, utilizing the 982 N push force to clear metal blanks reliably.
Replacing the Airtac SI50 Standard Cylinder SI50X800SN with the SAI50X800SN
To replace the SI50X800SN, order the SAI50X800SN. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the -S magnet for current AirTAC switch compatibility. The 50 mm bore yields 982 N push at 0.5 MPa; if undersized, the 63 mm bore offers 1559 N. Because this is an 800 mm stroke, prevent rod bending by using an external guide to absorb side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or the SAIL lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X800SN
- ✓ 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 SI50X800SN FAQ
Yes, the SI50X800SN is discontinued. The direct replacement is the AirTAC SAI50X800SN. It shares the same ISO 15552 mounting interface, 50 mm bore, 800 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/4 port, a 20 mm rod with an M16x1.5 thread, and operates at 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, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X800SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X800SN replacement — usually within 7-8 hours.