This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X204S, 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 SI80X204S
The AirTAC SI80 Standard Air Cylinder SI80X204S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 204mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X204S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke204 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X204S
- 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 SI80X204S
The AirTAC SI80X204S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, adjustable air cushions, and a built-in piston magnet for CS1-B/DS1-B switches. In the 80 mm bore class it delivers a push force of 2513 N and pull of 2268 N at 0.5 MPa, utilizing a G3/8 port and a Ø25 mm piston rod with an M20x1.5 thread.
You should order the direct replacement SAI80X204S, which preserves the exact ISO 15552 mounting dimensions, 204 mm stroke, port, and output force. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI80 Standard Air Cylinder SI80X204S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X204S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X204S |
| Bore size | Ø80 mm |
| Stroke | 204 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 SAI80X204S 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 SAI80X204S 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 SI80X204S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×204 | 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 SI80X204S Is Used
Press Fit Tooling
Drives medium-tonnage press operations and bushing insertion tasks where the 2513 N push force at 0.5 MPa provides consistent, reliable clamping.
Pallet Diversion
Actuates heavy diverters and lifting stops on conveyor lines, easily handling loads up to the 128 kg vertical lift threshold.
Material Handling Gates
Operates large access gates and heavy workpiece clamps using the robust Ø25 mm carbon steel rod and adjustable 36 mm end cushions.
Replacing the Airtac SI80 Standard Air Cylinder SI80X204S with the SAI80X204S
To replace this SI unit, specify the SAI80X204S by confirming the ISO 15552 mounting interface, the 80 mm bore, the 204 mm stroke, the G3/8 port (available in PT, G, or NPT), and the -S magnet for position sensing. The SAI family also introduces variants the SI lacked, such as the SAIL air-released lock, the SAIF integrated 4M valve, and the BSAI clamp-lock. Because a standard cylinder drifts without live air and its cushion only decelerates the load near the stroke ends, use the SAIL or BSAI lock variant, an external rod lock, or a pilot check valve if you need to hold a load securely. If sizing up or down, neighboring bores are 63 mm and 100 mm; at 0.5 MPa the 63 mm bore pushes 1559 N, while the 100 mm bore pushes 3927 N. For any stroke of 300 mm or longer, add a guide to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X204S
- ✓ 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 SI80X204S FAQ
Yes, the AirTAC SI80X204S is discontinued and end-of-life. The direct replacement is the SAI80X204S. It features the same ISO 15552 mounting interface, 80 mm bore, 204 mm stroke, G3/8 port, and output force, so it drops directly into existing fixtures.
The 80 mm bore uses a G3/8 air port. The theoretical force outputs are: 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 maximum force of 513 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X204S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X204S replacement — usually within 7-8 hours.