This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X390S, 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 SI80X390S
The AirTAC SI80 Standard Air Cylinder SI80X390S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 390mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X390S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke390 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X390S
- 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 SI80X390S
The AirTAC SI80X390S is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and a built-in piston magnet for CS1-B/DS1-B switches. Delivering 2513 N push force at 0.5 MPa through a G3/8 port, it served robust automation tasks. AirTAC replaced this legacy unit with the SAI80X390S, a direct upgrade retaining the exact ISO 15552 mounting interface, 390 mm stroke, and 25 mm rod.
The SAI replacement incorporates an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line, and offers Viton H seals for 0-150 C environments.
Airtac SI80 Standard Air Cylinder SI80X390S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X390S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X390S |
| Bore size | Ø80 mm |
| Stroke | 390 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 SAI80X390S 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 SAI80X390S 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 SI80X390S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×390 | 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 SI80X390S Is Used
Package Diversion
Drives heavy-duty sorting arms on packaging lines, utilizing the 2513 N push force to deflect large cartons at high throughput.
Pallet Handling
Actuates 390 mm stroke lifting mechanisms for pallet positioning, requiring external guides to manage side loads during transit.
Press Ejection
Ejects formed metal components from press beds, relying on adjustable 36 mm air cushions to decelerate the 25 mm rod at stroke end.
Replacing the Airtac SI80 Standard Air Cylinder SI80X390S with the SAI80X390S
To replace the SI80X390S, order the SAI80X390S. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G3/8 port threads, and the M20x1.5 rod end. Because this is a 390 mm stroke, use external guides to prevent rod bending and side-load damage. If sizing alternatives, neighboring bores (63mm or 100mm) shift the 0.5 MPa push force down to 1559 N or up to 3927 N. Remember: a plain cylinder drifts without live air, as cushions only decelerate. For load holding, specify the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X390S
- ✓ 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 SI80X390S FAQ
Yes, the SI80X390S is discontinued. The direct replacement is the SAI80X390S. It shares the identical ISO 15552 mounting interface, 80 mm bore, 390 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 80 mm bore delivers 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, and a theoretical max of 513 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with a 36 mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X390S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X390S replacement — usually within 7-8 hours.