This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X80, 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 SI50 Standard Cylinder SI50X80
The AirTAC Airtac SI50 Standard Cylinder SI50X80 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X80, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X80
- 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 SI50 Standard Cylinder SI50X80
The AirTAC SI50X80 is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and 50 mm bore, delivering 982 N push force at 0.5 MPa through its G1/4 port. AirTAC replaced this legacy unit with the SAI50X80, a direct upgrade sharing the exact same ISO 15552 mounting interface, bore, stroke, output force, port size and mounting accessories.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI50 Standard Cylinder SI50X80 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X80 |
| Bore size | Ø50 mm |
| Stroke | 80 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X80 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X80 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X80
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SI50 Standard Cylinder SI50X80 Is Used
Package Diverting
Pushes medium-weight cartons off a main conveyor line using a reliable 982 N push force at 0.5 MPa.
Clamp Actuation
Drives short-stroke clamping fixtures holding workpieces up to 50 kg during light machining operations.
Stopper Gate
Raises and lowers pneumatic stop gates to regulate pallet flow within automated storage systems.
Replacing the Airtac SI50 Standard Cylinder SI50X80 with the SAI50X80
To replace the discontinued SI50X80, order the SAI50X80. Confirm your ISO 15552 mounting interface (LB, FA, TC, etc.), the 80 mm stroke, and the G1/4 port (available in PT, G, or NPT threads). Because this SKU has no magnet, you cannot mount position sensors; if sensing is required, order the SAI50X80S instead. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; if you need less force, step down to a 40 mm bore (628 N), or step up to a 63 mm bore (1559 N) for heavier loads. Remember, a standard cylinder drifts without live air—the cushion only decelerates—so use an external pilot check valve or the SAIL lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X80
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X80 FAQ
Yes, the SI50X80 is discontinued. The direct replacement is the AirTAC SAI50X80. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 80 mm stroke, G1/4 port, and mounting interface, so it fits existing fixtures perfectly.
The G1/4 port bore delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 30 mm adjustable air cushion at each end.
Request a Quote for the SAI50X80
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X80 replacement — usually within 7-8 hours.