This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X400SFTC, 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 SI80X400SFTC
The AirTAC SI80 Standard Air Cylinder SI80X400SFTC 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 SAI80X400SFTC, 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 → SAI80X400SFTC
- 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 SI80X400SFTC
The AirTAC SI80X400SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 400 mm stroke and FTC trunnion mount. Delivering 2513 N push force at 0.5 MPa, it features a 25 mm rod, M20x1.5 thread, and G3/8 port. The direct replacement is the SAI80X400SFTC, matching the exact bore, stroke, force, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants. This -S SKU includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI80 Standard Air Cylinder SI80X400SFTC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X400SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X400SFTC |
| 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 SAI80X400SFTC 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 SAI80X400SFTC 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 SI80X400SFTC
| 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 SI80X400SFTC Is Used
Pallet Diversion
Routes heavy pallets along a 400 mm stroke transfer line using the 2513 N push force, fitting seamlessly into ISO 15552 trunnion mounts.
Press Ejection
Ejects formed parts from a stamping press over a 400 mm travel, requiring external guides to prevent rod bending during the long stroke.
Replacing the Airtac SI80 Standard Air Cylinder SI80X400SFTC with the SAI80X400SFTC
To replace the SI80X400SFTC, order the SAI80X400SFTC. Verify the ISO 15552 FTC trunnion mount, 80 mm bore, 400 mm stroke, G3/8 port, and the -S magnet. For sizing, the 63 mm bore yields 1559 N push at 0.5 MPa, while the 100 mm bore reaches 3927 N. Note that a plain cylinder drifts on air loss since the 36 mm cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 400 mm stroke is long, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X400SFTC
- ✓ 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 SI80X400SFTC FAQ
Yes, the SI80X400SFTC is discontinued. The direct replacement is the SAI80X400SFTC, which shares the identical ISO 15552 mounting interface, 80 mm bore, 400 mm stroke, output force, and G3/8 port.
It features a G3/8 port and provides 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 SAI80X400SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X400SFTC replacement — usually within 7-8 hours.