This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X400S, 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 SI80X400S
The AirTAC SI80 Standard Air Cylinder SI80X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 400mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke400 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X400S
- 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 SI80X400S
The AirTAC SI80X400S is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm bore and 400 mm stroke. It delivers 2513 N push and 2268 N pull at 0.5 MPa, operating through a G3/8 port. AirTAC replaced this legacy unit with the SAI80X400S, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, force, port and mounting accessories.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For applications needing load holding on air loss, the SAI family introduces SAIL and BSAI lock variants the SI lacked. This -S model includes a piston magnet for CS1-B/DS1-B switches.
Airtac SI80 Standard Air Cylinder SI80X400S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X400S |
| Bore size | Ø80 mm |
| Stroke | 400 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 SAI80X400S 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 SAI80X400S 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 SI80X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×400 | 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 SI80X400S Is Used
Pallet Diversion
Routes heavy pallets across packaging lines using the 2513 N push force, with the 400 mm stroke clearing wide transfer zones.
Press Ejection
Ejects dense machined components from fixtures, relying on adjustable 36 mm air cushions to decelerate the rod at stroke end.
Replacing the Airtac SI80 Standard Air Cylinder SI80X400S with the SAI80X400S
To replace the SI80X400S, order the SAI80X400S. Verify the ISO 15552 mounting interface, 80 mm bore, 400 mm stroke, G3/8 port (PT/G/NPT thread), and your mounting accessory (LB, FA, TC, etc.). The -S suffix means a magnet is present for legacy CS1-B/DS1-B sensors; the SAI uses current AirTAC switches. For sizing, the 80 mm bore yields 2513 N push at 0.5 MPa; dropping to a 63 mm bore gives 1559 N, while an 100 mm bore provides 3927 N. Because this is a 400 mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X400S
- ✓ 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 SI80X400S FAQ
Yes, the AirTAC SI80X400S is discontinued. The direct replacement is the SAI80X400S. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 400 mm stroke, G3/8 port, output force, and mounting fixtures.
This double-acting cylinder uses a G3/8 port. It generates 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 force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X400S replacement — usually within 7-8 hours.