This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX80S, 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 SI50BX80S
The AirTAC Airtac SI50 Standard Cylinder SI50BX80S 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 SAI50BX80S, 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 → SAI50BX80S
- 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 SI50BX80S
The AirTAC SI50BX80S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 80mm stroke. Delivering 982 N push and 825 N pull at 0.5 MPa, it is replaced by the SAI50BX80S. This direct upgrade keeps the G1/4 port, M16x1.5 rod thread, and 30 mm cushions. The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure, and the -B rod is SUS304 stainless steel.
Note that standard cylinders drift without air; for load holding, explore the SAIL lock or BSAI clamp-lock variants.
Airtac SI50 Standard Cylinder SI50BX80S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX80S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX80S |
| 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 SAI50BX80S 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 SAI50BX80S 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 SI50BX80S
| 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 SI50BX80S Is Used
Stainless Rod Clamping
Ideal for packaging machines where the SUS304 rod resists washdown chemicals while providing 982 N of clamping force.
Conveyor Diverting
Pushes product lanes at 30-800 mm/s using the G1/4 port, with adjustable 30 mm cushions absorbing end-of-stroke impact.
Replacing the Airtac SI50 Standard Cylinder SI50BX80S with the SAI50BX80S
To replace the SI50BX80S, order the SAI50BX80S. It is dimensionally interchangeable per ISO 15552, retaining the exact 50mm bore, 80mm stroke, G1/4 port, and SUS304 stainless rod. If downsizing, a 40mm bore yields 628 N push at 0.5 MPa; if upsizing, a 63mm bore provides 1559 N. The standard cushion only decelerates the load—it does not hold position. For secure holding without air, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. The built-in magnet supports legacy CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX80S
- ✓ 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 SI50BX80S FAQ
Yes, the AirTAC SI50BX80S is discontinued. The direct replacement is the SAI50BX80S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 80mm stroke, G1/4 port, and mounting interface exactly.
The 50mm bore features a G1/4 air port. It delivers a push force of 982 N and pull of 825 N at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX80S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX80S replacement — usually within 7-8 hours.