This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX250SN, 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 SI80BX250SN
The AirTAC SI80 Standard Air Cylinder SI80BX250SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX250SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX250SN
- 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 SI80BX250SN
The AirTAC SI80BX250SN is a discontinued double-acting ISO 15552 profile cylinder featuring a corrosion-resistant SUS304 stainless piston rod, an NBR seal, and a built-in magnet. Delivering 2513 N push force at 0.5 MPa through a G3/8 port, it is replaced by the SAI80BX250SN. This direct successor matches the exact bore, stroke, and ISO 15552 mounting interface.
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 absent from the SI line.
Airtac SI80 Standard Air Cylinder SI80BX250SN Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX250SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX250SN |
| Bore size | Ø80 mm |
| Stroke | 250 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 SAI80BX250SN 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 SAI80BX250SN 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 SI80BX250SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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 SI80BX250SN Is Used
Packaging Diverters
Drives sorting gates on packaging lines where the 2513 N thrust at 0.5 MPa easily deflects heavy cartons.
Pallet Lift Stations
Lifts loaded pallets vertically; the SUS304 rod resists humidity while safely handling a 128 kg load.
Machine Tool Clamping
Secures large steel castings for machining, relying on the 36 mm adjustable air cushions to absorb impact.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX250SN with the SAI80BX250SN
To replace the SI80BX250SN, order the SAI80BX250SN. Confirm the ISO 15552 mounting interface, the 80mm bore, 250mm stroke, G3/8 port, and your specific mounting accessory. The -S magnet enables legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), while -B specifies the SUS304 rod and -N the NBR seal. Sizing both ways: a 63mm bore yields 1559 N push at 0.5 MPa, whereas a 100mm bore yields 3927 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI variants. At 250mm stroke, guide external rods to prevent side-load bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX250SN
- ✓ 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 SI80BX250SN FAQ
Yes, the SI80BX250SN is discontinued. The direct replacement is the SAI80BX250SN. It shares the identical ISO 15552 mounting interface, 80mm bore, 250mm stroke, force, and G3/8 port, fitting existing fixtures perfectly.
It features a G3/8 port and provides 2513 N push / 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical max of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX250SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX250SN replacement — usually within 7-8 hours.