This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX350, 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 SI50BX350
The AirTAC Airtac SI50 Standard Cylinder SI50BX350 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX350, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX350
- 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 SI50BX350
The AirTAC SI50BX350 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 350mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50BX350, featuring an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Since this SKU lacks a magnet, it cannot accept a CS1-B/DS1-B sensor. The SAI family adds SAIL, SAIF, and BSAI variants. A Viton H seal option raises heat resistance to 150 C.
Airtac SI50 Standard Cylinder SI50BX350 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX350 |
| Bore size | Ø50 mm |
| Stroke | 350 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 SAI50BX350 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 SAI50BX350 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 SI50BX350
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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 SI50 Standard Cylinder SI50BX350 Is Used
Material Diversion
Actuates routing gates on packaging lines, using the 982 N push force to deflect cartons at 30-800 mm/s.
Pallet Handling
Pushes totes into staging zones, where the adjustable 30mm cushion decelerates the load smoothly.
Replacing the Airtac SI50 Standard Cylinder SI50BX350 with the SAI50BX350
To replace the SI50BX350, order the SAI50BX350. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 350mm stroke, G1/4 port, M16x1.5 thread, and mounting. This no-magnet SKU cannot take a switch. If you need more force, the 63mm bore offers 1559 N. Because the 350mm stroke invites rod bending, use an external guide to prevent side loads. A plain cylinder drifts on air loss; for load holding, use a pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX350
- ✓ 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 SI50BX350 FAQ
Yes, the AirTAC SI50BX350 is discontinued. The direct replacement is the SAI50BX350. It shares the identical ISO 15552 mounting interface, 50mm bore, 350mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port feeds a cylinder delivering 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The 20mm rod has an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX350
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX350 replacement — usually within 7-8 hours.