This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX25, 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 SI80BX25
The AirTAC SI80 Standard Air Cylinder SI80BX25 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX25, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX25
- 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 SI80BX25
The AirTAC SI80BX25 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 2513 N push force at 0.5 MPa via its G3/8 port. This specific SKU features a SUS304 stainless steel piston rod (the -B option) for corrosion resistance, but because it lacks a -S magnet suffix, it cannot accept a position sensor.
AirTAC replaced this legacy unit with the SAI80BX25, a direct upgrade sharing the exact ISO 15552 mounting interface, 25 mm stroke, and 36 mm cushions. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure.
Airtac SI80 Standard Air Cylinder SI80BX25 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX25 |
| Bore size | Ø80 mm |
| Stroke | 25 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 SAI80BX25 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 SAI80BX25 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 SI80BX25
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×25 | 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 SI80BX25 Is Used
Stainless Rod Clamping
Short-stroke clamping of mid-weight parts in machining fixtures, leveraging the SUS304 rod for washdown resistance.
Press Fit Assembly
Exerts 2513 N at 0.5 MPa to seat bearings or pins, with adjustable 36 mm cushions absorbing end-of-stroke impact.
Transfer Line Diverter
Short 25 mm stroke actuates routing gates on packaging lines, safely moving loads up to 1508 N without sensor feedback.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX25 with the SAI80BX25
To replace this SI cylinder, order the SAI80BX25, which matches the 80 mm bore, 25 mm stroke, G3/8 port, and M20x1.5 rod thread. Because this SKU lacks a magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if you need position feedback, select an SAI80X25S instead. If sizing alternatives, 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—the cushion only decelerates—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants. The Viton H seal option raises operating temperature to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX25
- ✓ 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 SI80BX25 FAQ
Yes, the SI80BX25 is discontinued. The direct replacement is the SAI80BX25, which maintains the identical ISO 15552 mounting interface, 80 mm bore, 25 mm stroke, and G3/8 port for a seamless fixture swap.
It features a G3/8 air port and provides 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N at 0.9 MPa, and a maximum theoretical force of 513 kgf at 1.0 MPa.
Request a Quote for the SAI80BX25
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX25 replacement — usually within 7-8 hours.