This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X440, 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 SI80X440
The AirTAC SI80 Standard Air Cylinder SI80X440 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 440mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X440, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke440 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X440
- 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 SI80X440
The AirTAC SI80X440 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 2513 N push force at 0.5 MPa through its G3/8 port. Because this exact SKU is end-of-life, AirTAC replaced it with the SAI80X440. This current-production direct maintains the same ISO 15552 mounting interface, 80 mm bore, 440 mm stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade features a redesigned piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SI configuration lacks a magnet (-S), so it cannot accept CS1-B or DS1-B sensors.
Airtac SI80 Standard Air Cylinder SI80X440 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X440 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X440 |
| Bore size | Ø80 mm |
| Stroke | 440 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 SAI80X440 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 SAI80X440 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 SI80X440
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×440 | 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 SI80X440 Is Used
Pallet Transfer
Indexes heavy pallets along a conveyor line using the 2513 N push force at 0.5 MPa, with adjustable cushions absorbing kinetic energy at stroke ends.
Material Lift Gate
Actuates a lifting gate for warehouse docks; external guides are critical here to manage the 440 mm stroke and prevent rod bending under offset loads.
Press Ejection
Ejects formed parts from a press. Since this non-magnet SKU cannot take sensors, external mechanical stops or separate proximity sensors must govern timing.
Replacing the Airtac SI80 Standard Air Cylinder SI80X440 with the SAI80X440
To replace the SI80X440, order the SAI80X440 direct, confirming the ISO 15552 mounting interface, 80 mm bore, 440 mm stroke, G3/8 port (PT/G/NPT thread), and M20x1.5 rod thread. Because this legacy SKU lacks the -S magnet, it cannot support position sensing; if switches are needed, order the SAI equivalent with the S suffix for current AirTAC sensors. When sizing, neighboring bores offer different forces: a 63 mm bore yields 1559 N push at 0.5 MPa, while a 100 mm bore yields 3927 N. A plain cylinder does not hold load on air loss—the cushion only decelerates—so for load holding consider the SAIL or BSAI lock variants, or an external pilot check valve. Finally, at 440 mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X440
- ✓ 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 SI80X440 FAQ
Yes, the SI80X440 is discontinued. The direct replacement is the AirTAC SAI80X440. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 440 mm stroke, 2513 N force, G3/8 port, and mounting accessories, so it drops directly into existing fixtures.
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 push at 0.9 MPa, and a theoretical max force of 513 kgf at 1.0 MPa. The SAI replacement retains these exact ratings while upgrading the piston seal.
Request a Quote for the SAI80X440
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X440 replacement — usually within 7-8 hours.