This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX250H, 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 SI80BX250H
The AirTAC SI80 Standard Air Cylinder SI80BX250H 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 SAI80BX250H, 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 → SAI80BX250H
- 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 SI80BX250H
The AirTAC SI80BX250H is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 250mm stroke. It delivers 2513N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI80BX250H, matching the interface, force, and port exactly. This specific SKU includes a -B SUS304 stainless piston rod for corrosion resistance and a -H Viton seal rated for 0-150C.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors.
Airtac SI80 Standard Air Cylinder SI80BX250H Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX250H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX250H |
| 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 SAI80BX250H 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 SAI80BX250H 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 SI80BX250H
| 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 SI80BX250H Is Used
High-Temp Forming Press
Actuates clamping fixtures in heated environments up to 150C using the Viton H seal and SUS304 rod.
Heavy Package Divert
Pushes 128kg vertical loads or heavy pallets at 30-800mm/s with 2513N thrust at 0.5MPa.
Corrosive Fluid Routing
Deploys the SUS304 stainless rod in washdown or chemical zones to resist rust and pitting.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX250H with the SAI80BX250H
To replace the SI80BX250H, order the SAI80BX250H. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the 80mm bore, 250mm stroke, G3/8 port, M20x1.5 rod thread, and 36mm cushions. Verify your mounting accessory (LB, FA, TC, etc.) and high-temp Viton H requirement. Sizing both ways: a 63mm bore yields 1559N push at 0.5MPa, while a 100mm bore yields 3927N. For load holding, note a plain cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or the SAIL/BSAI lock variants. At 250mm stroke, ensure guide alignment to prevent rod bending side-loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX250H
- ✓ 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 SI80BX250H FAQ
Yes, the SI80BX250H is discontinued. The direct replacement is the SAI80BX250H. It shares the identical ISO 15552 mounting interface, 80mm bore, 250mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The bore dictates a G3/8 port. Force ratings are: 2513N push and 2268N pull at 0.5MPa, 3518N push at 0.7MPa, 4523N push at 0.9MPa, and a theoretical max of 513kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX250H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX250H replacement — usually within 7-8 hours.