This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX450, 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 SI50BX450
The AirTAC SI50 Standard Cylinder SI50BX450 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX450, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX450
- 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 SI50BX450
The AirTAC SI50BX450 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 450 mm stroke. Delivering 982 N push force at 0.5 MPa, it is replaced by the SAI50BX450. This direct upgrade matches the exact bore, stroke, G1/4 port, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet, so it cannot take a sensor. A Viton H seal option raises heat to 150 C.
Airtac SI50 Standard Cylinder SI50BX450 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX450 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX450 |
| Bore size | Ø50 mm |
| Stroke | 450 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 SAI50BX450 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 SAI50BX450 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 SI50BX450
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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 SI50BX450 Is Used
Material Diversion
Drives diverter gates on packaging lines where the 982 N push force at 0.5 MPa easily redirects standard totes.
Pallet Handling
Actuates 450 mm stop gates at pallet conveyors, benefiting from the adjustable 30 mm air cushions at both ends.
Replacing the Airtac SI50 Standard Cylinder SI50BX450 with the SAI50BX450
To replace the SI50BX450, order the SAI50BX450. Verify the ISO 15552 mounting interface, 50 mm bore, 450 mm stroke, and G1/4 port (PT/G/NPT). Because this SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor; if sensing is needed, switch to an -S model. At 0.5 MPa it yields 982 N push (825 N pull); sizing down to a 40 mm bore gives 628 N push, while sizing up to 63 mm provides 1559 N. For this 450 mm stroke, use external guides to prevent rod bending and side-load damage. The standard cylinder does not hold load without air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX450
- ✓ 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 SI50BX450 FAQ
Yes, the AirTAC SI50BX450 is discontinued. The direct replacement is the SAI50BX450. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the same 50 mm bore, 450 mm stroke, output force, and G1/4 port.
The G1/4 port is fixed by the 50 mm bore. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The piston rod is Ø20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX450
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX450 replacement — usually within 7-8 hours.