This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX350, 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 SI80BX350
The AirTAC SI80 Standard Air Cylinder SI80BX350 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 350mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX350, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke350 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX350
- 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 SI80BX350
The AirTAC SI80BX350 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 2513 N push and 2268 N pull at 0.5 MPa. The direct replacement is the SAI80BX350, which matches the 80 mm bore, 350 mm stroke, G3/8 port, and ISO 15552 mounting interface. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -B variant uses a SUS304 stainless piston rod for corrosion resistance, and because it lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor.
The standard cylinder operates at 30-800 mm/s, but note that a plain cylinder does not hold load on air loss; the 36 mm adjustable air cushions only decelerate near stroke ends. For held loads, consider an external pilot check valve or the SAI family's SAIL or BSAI lock variants.
Airtac SI80 Standard Air Cylinder SI80BX350 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX350 |
| Bore size | Ø80 mm |
| Stroke | 350 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 SAI80BX350 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 SAI80BX350 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 SI80BX350
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×350 | 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 SI80BX350 Is Used
Carton Diverting Gate
Actuates a routing flap on a high-speed packaging line, using the 350 mm stroke to clear the conveyor lane while the SUS304 rod resists washdown moisture.
Pallet Lowering Arm
Lowers a 120 kg fixture smoothly using adjustable 36 mm cushions to absorb kinetic energy at stroke end, avoiding hard impacts on the pallet stack.
Storage Tray Pusher
Indexes dense storage trays along a roller bed, where the 2513 N push force at 0.5 MPa easily overcomes rolling friction without requiring maximum air pressure.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX350 with the SAI80BX350
To replace the SI80BX350, order the SAI80BX350 to get the exact 80 mm bore, 350 mm stroke, 2513 N output at 0.5 MPa, G3/8 port, and ISO 15552 mounting interface. Confirm your mounting accessory (LB, FA, TC, etc.) and thread type (PT, G, NPT). Because this SKU lacks the -S magnet, it cannot support position sensing; if you need switches, order the SAI with an S suffix and use current AirTAC sensors. For sizing alternatives, dropping to a 63 mm bore yields 1559 N push, while stepping up to a 100 mm bore provides 3927 N. At 350 mm stroke, prevent rod bending by guiding the load externally to avoid side-load forces. Finally, remember the cushion only decelerates; use a pilot-operated check valve, external rod lock, or the SAIL/BSAI lock variant to hold loads securely.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX350
- ✓ 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 SI80BX350 FAQ
Yes, the SI80BX350 is discontinued. The direct replacement is the SAI80BX350. It features the same ISO 15552 mounting interface, 80 mm bore, 350 mm stroke, output force, and G3/8 port, dropping directly into existing fixtures.
This double-acting cylinder has a G3/8 air port and an M20x1.5 rod thread. It delivers 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 force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX350
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX350 replacement — usually within 7-8 hours.