This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X1250STC, 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 SI80X1250STC
The AirTAC SI80 Standard Air Cylinder SI80X1250STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 1250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X1250STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke1250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X1250STC
- 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 SI80X1250STC
The AirTAC SI80X1250STC is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore, 1250mm stroke, and a G3/8 air port. Delivering 2513N push force at 0.5MPa, it is replaced by the SAI80X1250STC. This direct successor shares the exact ISO 15552 mounting interface, TC trunnion, and output, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S code means a piston magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI80 Standard Air Cylinder SI80X1250STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X1250STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X1250STC |
| Bore size | Ø80 mm |
| Stroke | 1250 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 SAI80X1250STC 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 SAI80X1250STC 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 SI80X1250STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×1250 | 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 SI80X1250STC Is Used
Long-Stroke Transfer
Pushes heavy pallets between machining centers using the full 1250mm travel and 2513N thrust at 0.5MPa.
Automated Assembly Line
Indexing large automotive subframes into position, leveraging the TC trunnion to absorb moment loads.
Replacing the Airtac SI80 Standard Air Cylinder SI80X1250STC with the SAI80X1250STC
To replace this SI80X1250STC, order the SAI80X1250STC. Verify the ISO 15552 TC trunnion mount, 80mm bore, 1250mm stroke, G3/8 port, and the -S magnet. If you need less force, a 63mm bore gives 1559N push at 0.5MPa; for more, a 100mm bore yields 3927N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 1250mm, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X1250STC
- ✓ 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 SI80X1250STC FAQ
Yes, the SI80X1250STC is discontinued. The direct replacement is the SAI80X1250STC. It is dimensionally interchangeable per ISO 15552, retaining the same 80mm bore, 1250mm stroke, G3/8 port, TC mount, and force ratings.
At 0.5MPa it provides 2513N push and 2268N pull. At 0.7MPa push is 3518N, and at 0.9MPa it is 4523N. The theoretical max force is 513kgf at 1.0MPa, with an operating speed of 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X1250STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X1250STC replacement — usually within 7-8 hours.