This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X550STC, 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 SI80 Standard Air Cylinder SI80X550STC
The AirTAC SI80 Standard Air Cylinder SI80X550STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 550mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X550STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke550 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X550STC
- 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 SI80 Standard Air Cylinder SI80X550STC
The AirTAC SI80X550STC is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 550mm stroke. Providing 2513 N push force at 0.5 MPa via a G3/8 port, it featured a built-in magnet for CS1-B/DS1-B sensors and a TC trunnion mount. AirTAC replaced this EOL unit with the SAI80X550STC.
The SAI80X550STC is a direct replacement matching the ISO 15552 mounting interface, bore, stroke, output force, port and TC accessory. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI80 Standard Air Cylinder SI80X550STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X550STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X550STC |
| Bore size | Ø80 mm |
| Stroke | 550 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI80X550STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAI80X550STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI80 Standard Air Cylinder SI80X550STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×550 | 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 SI80 Standard Air Cylinder SI80X550STC Is Used
Pallet Diversion
Actuates heavy lane-guides on packaging conveyors, utilizing the 550mm stroke to shift pallets smoothly between parallel transport lines.
Vertical Lift Gate
Raises and lowers mezzanine safety gates, where the 80mm bore provides the robust push force needed to counteract heavy gravity loads.
Material Ejection
Pushes molded parts out of hydraulic presses, relying on the adjustable end-cushions to decelerate the 550mm travel safely.
Replacing the Airtac SI80 Standard Air Cylinder SI80X550STC with the SAI80X550STC
To replace the SI80X550STC, order the SAI80X550STC. Verify the ISO 15552 TC trunnion interface, 80mm bore, 550mm stroke, G3/8 port and the -S magnet for current AirTAC switches. If downsizing, neighbouring 63mm bores yield 1559 N push at 0.5 MPa; if upsizing, 100mm bores provide 3927 N. Because this is a 550mm stroke, use an external guide to prevent rod-bending under side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X550STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI80 Standard Air Cylinder SI80X550STC FAQ
Yes, the AirTAC SI80X550STC is discontinued. The direct replacement is the SAI80X550STC. It shares the identical ISO 15552 mounting interface, 80mm bore, 550mm stroke, output force, G3/8 port and TC trunnion mount, fitting existing fixtures perfectly.
This 80mm bore cylinder uses a G3/8 air port. It delivers 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, and a theoretical maximum force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X550STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X550STC replacement — usually within 7-8 hours.