This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX320S, 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 SI50BX320S
The AirTAC Airtac SI50 Standard Cylinder SI50BX320S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 320mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX320S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke320 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX320S
- 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 SI50BX320S
The AirTAC SI50BX320S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 320mm stroke, and SUS304 stainless steel rod. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50BX320S. This direct upgrade shares identical ISO 15552 mounting dimensions, porting (G1/4), and accessories.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet supports legacy CS1-B/DS1-B sensors, while load holding requires external checks since cushions only decelerate.
Airtac SI50 Standard Cylinder SI50BX320S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX320S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX320S |
| Bore size | Ø50 mm |
| Stroke | 320 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 SAI50BX320S 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 SAI50BX320S 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 SI50BX320S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×320 | 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 SI50BX320S Is Used
Stainless Rod Diverters
Ideal for pushing packages on packaging lines where moisture requires the SUS304 rod option to prevent corrosion.
Long Stroke Ejectors
The 320mm stroke handles part ejection tasks, provided external guides mitigate side-load risks on the extended rod.
Replacing the Airtac SI50 Standard Cylinder SI50BX320S with the SAI50BX320S
To replace the SI50BX320S, order the SAI50BX320S, confirming the ISO 15552 interface, 50mm bore, 320mm stroke, G1/4 port, and SUS304 (-B) rod. If downsizing, a 40mm bore yields 628N push at 0.5MPa; if upsizing, a 63mm bore yields 1559N. For the 320mm stroke, use external guides to prevent rod bending from side loads. A plain cylinder drifts on air loss, so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX320S
- ✓ 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 SI50BX320S FAQ
Yes, the SI50BX320S is discontinued. The direct replacement is the SAI50BX320S, which shares the same ISO 15552 mounting interface, 50mm bore, 320mm stroke, G1/4 port, and output force.
The G1/4 port bore delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX320S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX320S replacement — usually within 7-8 hours.