This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X1250S, 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 SI80X1250S
The AirTAC SI80 Standard Air Cylinder SI80X1250S 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 SAI80X1250S, 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 → SAI80X1250S
- 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 SI80X1250S
The AirTAC SI80X1250S is a discontinued double-acting ISO 15552 profile cylinder with a 1250 mm stroke and a built-in piston magnet for CS1-B/DS1-B switches. Delivering 2513 N push and 2268 N pull at 0.5 MPa through a G3/8 port, it is superseded by the SAI80X1250S direct replacement. This upgrade retains the exact bore, stroke, force, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI80X1250S features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent from the legacy SI line.
Airtac SI80 Standard Air Cylinder SI80X1250S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X1250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X1250S |
| 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 SAI80X1250S 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 SAI80X1250S 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 SI80X1250S
| 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 SI80X1250S Is Used
Long-Stroke Diversion
Actuates large diverter gates on material handling lines, utilizing the full 1250 mm travel to shift heavy pallets between parallel conveyor routes.
Industrial Press Ejection
Ejects formed metal components from heavy presses, relying on 2513 N of push force at 0.5 MPa to clear large parts safely from the tooling area.
Replacing the Airtac SI80 Standard Air Cylinder SI80X1250S with the SAI80X1250S
To replace the SI80X1250S, order the SAI80X1250S keeping the identical 80 mm bore, 1250 mm stroke, G3/8 port, M20x1.5 rod thread, and -S magnet. Confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.) and thread standard (PT, G, or NPT). Because the 1250 mm stroke exceeds 300 mm, use an external guide to prevent rod bending and side-load damage. Sizing both ways: a 63 mm bore yields 1559 N push at 0.5 MPa, while a 100 mm bore yields 3927 N. Note that a plain cylinder drifts on air loss; for load holding, use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X1250S
- ✓ 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 SI80X1250S FAQ
Yes, the AirTAC SI80X1250S is discontinued. The direct replacement is the SAI80X1250S. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 1250 mm stroke, G3/8 port, output force, and mounting accessories.
At 0.5 MPa it provides 2513 N push and 2268 N pull; at 0.7 MPa push is 3518 N, and at 0.9 MPa push is 4523 N. The theoretical max force is 513 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and it uses a G3/8 port with a 36 mm adjustable cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X1250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X1250S replacement — usually within 7-8 hours.