This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X540S, 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 SI80X540S
The AirTAC SI80 Standard Air Cylinder SI80X540S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 540mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X540S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke540 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X540S
- 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 SI80X540S
The AirTAC SI80X540S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 2513 N push force at 0.5 MPa through its G3/8 port. Because this legacy SI series is end-of-life, AirTAC provides the direct replacement: the SAI80X540S. It maintains the same 80 mm bore, 540 mm stroke, M20x1.5 rod thread, and mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The original SI-S magnet supports CS1-B/DS1-B sensors, while the SAI family introduces SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI80 Standard Air Cylinder SI80X540S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X540S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X540S |
| Bore size | Ø80 mm |
| Stroke | 540 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 SAI80X540S 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 SAI80X540S 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 SI80X540S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×540 | 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 SI80X540S Is Used
Pallet Diversion
Actuates heavy diverters on packaging lines, using the 540 mm stroke to push standard pallets cleanly off the main conveyor belt.
Press Ejection
Ejects formed metal parts from hydraulic presses, relying on adjustable end cushions to decelerate the rod before impact.
Replacing the Airtac SI80 Standard Air Cylinder SI80X540S with the SAI80X540S
To replace the SI80X540S, order the SAI80X540S and verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), G3/8 port threads (PT/G/NPT), and the -S magnet requirement. The SAI uses current AirTAC switches instead of the legacy CS1-B/DS1-B. When sizing, neighboring bores offer alternatives: a 63 mm bore yields 1559 N push at 0.5 MPa, while a 100 mm bore yields 3927 N. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 540 mm stroke is long, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X540S
- ✓ 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 SI80X540S FAQ
Yes, the SI80X540S is discontinued. The direct replacement is the SAI80X540S. It is dimensionally interchangeable per ISO 15552, retaining the same 80 mm bore, 540 mm stroke, output force, G3/8 port, and mounting interface.
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 maximum 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 SAI80X540S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X540S replacement — usually within 7-8 hours.