This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX35S, 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 SI80BX35S
The AirTAC SI80 Standard Air Cylinder SI80BX35S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 35mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX35S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke35 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX35S
- 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 SI80BX35S
The AirTAC SI80BX35S is a discontinued double-acting ISO 15552 profile cylinder featuring an 80mm bore, 35mm stroke, and a SUS304 stainless steel rod. It delivers 2513 N push and 2268 N pull at 0.5 MPa, with a G3/8 air port. Because this SI series is end-of-life, you should order the direct replacement SAI80BX35S, which maintains the exact same ISO 15552 mounting interface, force, and porting.
The SAI80BX35S upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, and a Viton H seal option expands the temperature range up to 150 C.
Airtac SI80 Standard Air Cylinder SI80BX35S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX35S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX35S |
| Bore size | Ø80 mm |
| Stroke | 35 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 SAI80BX35S 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 SAI80BX35S 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 SI80BX35S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×35 | 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 SI80BX35S Is Used
Stainless Rod Clamping
Ideal for short-stroke clamping in washdown environments where the SUS304 rod resists corrosion and the 80mm bore provides 2513 N of secure holding force at 0.5 MPa.
Transfer Line Diverter
Acts as a high-force diverter on packaging lines, using the 35mm stroke to push products cleanly into secondary lanes without overshooting.
Pallet Load Stopper
Functions as a heavy-duty stop block for pallets, absorbing impact via the adjustable air cushion while the ISO 15552 profile barrel handles the 128 kg vertical load class.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX35S with the SAI80BX35S
To replace the discontinued SI80BX35S, order the SAI80BX35S. Confirm the ISO 15552 mounting interface, the 80mm bore, the 35mm stroke, the G3/8 port, and your mounting accessory. The -B code specifies the SUS304 stainless rod, and the -S code means it has a piston magnet for CS1-B/DS1-B switches. If you need to size both ways, a neighbouring 63mm bore yields 1559 N push at 0.5 MPa, while a 100mm bore yields 3927 N. Remember that a plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX35S
- ✓ 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 SI80BX35S FAQ
Yes, the SI80BX35S is discontinued. The direct replacement is the SAI80BX35S. It features the same ISO 15552 mounting interface, 80mm bore, 35mm stroke, G3/8 port, and SUS304 stainless rod, but adds an upgraded Y-shaped piston seal for longer life.
The 80mm bore uses a G3/8 air port. The force ratings are 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical maximum of 513 kgf at 1.0 MPa. The rod is Ø25 mm with an M20x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX35S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX35S replacement — usually within 7-8 hours.