This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X55S, 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 SI80X55S
The AirTAC SI80 Standard Air Cylinder SI80X55S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 55mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X55S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke55 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X55S
- 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 SI80X55S
The AirTAC SI80X55S is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 55mm stroke, delivering 2513 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI80X55S, a direct replacement retaining the exact ISO 15552 mounting interface, G3/8 port, and 2513 N output force.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. The original SI-SKU includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family also introduces SAIL and BSAI lock variants absent in the SI line.
Airtac SI80 Standard Air Cylinder SI80X55S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X55S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X55S |
| Bore size | Ø80 mm |
| Stroke | 55 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 SAI80X55S 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 SAI80X55S 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 SI80X55S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×55 | 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 SI80X55S Is Used
Mid-Tonnage Pressing
Applies 2513 N of push force at 0.5 MPa for seating bearings, stamping light sheet metal, or clinching components in automated assembly lines.
Pallet Diversion
Uses the 55mm stroke to extend a 25mm rod and push heavy pallets onto secondary conveyor tracks without overwhelming the routing mechanism.
Vertical Lifting
Raises 128 kg loads vertically in material handling systems, relying on the adjustable 36mm air cushions to prevent end-of-stroke impact damage.
Replacing the Airtac SI80 Standard Air Cylinder SI80X55S with the SAI80X55S
To replace the SI80X55S, order the SAI80X55S ensuring the ISO 15552 mounting interface, 80mm bore, 55mm stroke, and G3/8 port match your fixture. Keep the -S magnet option for current AirTAC switch compatibility (the legacy used CS1-B/DS1-B). If sizing alternatives, neighboring bores (63mm or 100mm) alter the 0.5 MPa push force (1559 N or 3927 N respectively). Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X55S
- ✓ 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 SI80X55S FAQ
Yes, the SI80X55S is discontinued. The direct replacement is the AirTAC SAI80X55S. It features the same ISO 15552 mounting interface, 80mm bore, 55mm stroke, G3/8 port, and output force, fitting directly into existing fixtures.
The 80mm bore features a G3/8 air port. Force output is 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical maximum of 513 kgf at 1.0 MPa.
Request a Quote for the SAI80X55S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X55S replacement — usually within 7-8 hours.