This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX250S, 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 SI80BX250S
The AirTAC SI80 Standard Air Cylinder SI80BX250S 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 SAI80BX250S, 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 → SAI80BX250S
- 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 SI80BX250S
The AirTAC SI80BX250S is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and a SUS304 stainless steel piston rod. Built for a 80mm bore, it delivers 2513N push force at 0.5MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI80BX250S, a direct upgrade retaining the exact ISO 15552 mounting interface, 250mm stroke, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family introduces lock and valve variants like SAIL and BSAI that the SI line lacked.
Airtac SI80 Standard Air Cylinder SI80BX250S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX250S |
| 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 SAI80BX250S 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 SAI80BX250S 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 SI80BX250S
| 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 SI80BX250S Is Used
Packaging Line Diversion
Uses the 2513N thrust at 0.5MPa to push heavy cartons reliably across transfer plates without stalling.
Pallet Stop Gate
The SUS304 stainless rod resists humidity in cold storage facilities while halting 128kg vertical loads.
Press Ejection System
Leverages the 36mm adjustable air cushion at stroke end to decelerate the 80mm bore smoothly before full extension.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX250S with the SAI80BX250S
To replace the SI80BX250S, order the SAI80BX250S. Confirm the ISO 15552 mounting interface, 80mm bore, 250mm stroke, G3/8 port, and your specific mounting accessory. The -B rod denotes SUS304 stainless steel, and -S indicates a magnet for CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing alternatives, a 63mm bore yields 1559N push at 0.5MPa, while a 100mm bore yields 3927N. Because this is a 250mm stroke, ensure adequate guide support to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX250S
- ✓ 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 SI80BX250S FAQ
Yes, the SI80BX250S is discontinued. The direct replacement is the SAI80BX250S. It shares the identical ISO 15552 mounting interface, 80mm bore, 250mm stroke, output force, and G3/8 port, fitting directly into existing fixtures.
The 80mm bore provides 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. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX250S replacement — usually within 7-8 hours.