This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX475, 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 SI50BX475
The AirTAC Airtac SI50 Standard Cylinder SI50BX475 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 475mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX475, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke475 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX475
- 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 SI50BX475
The AirTAC SI50BX475 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 475mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50BX475, matching the interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU uses a SUS304 stainless rod (B option) but lacks a magnet, so it cannot take a sensor.
Airtac SI50 Standard Cylinder SI50BX475 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX475 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX475 |
| Bore size | Ø50 mm |
| Stroke | 475 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 SAI50BX475 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 SAI50BX475 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 SI50BX475
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×475 | 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 SI50BX475 Is Used
Long-Stroke Diversion
Pushes packages across a transfer line using the 475mm stroke, guided externally to prevent rod bending under lateral stress.
Stainless Rod Washdown
Actuates a testing station in humid environments using the SUS304 piston rod option to resist corrosion.
Replacing the Airtac SI50 Standard Cylinder SI50BX475 with the SAI50BX475
To replace the SI50BX475, order the SAI50BX475. Confirm the ISO 15552 mounting interface, 50mm bore, 475mm stroke, G1/4 port, and your specific mounting accessory. Because this is a 475mm stroke, add external guides to prevent rod bending and side-load wear. For sizing, a neighbouring 40mm bore yields 628N push at 0.5MPa, while a 63mm bore gives 1559N. Note that without a magnet (-S), this cylinder cannot accept position sensors like the legacy CS1-B. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX475
- ✓ 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 SI50BX475 FAQ
Yes, the SI50BX475 is discontinued. The direct replacement is the SAI50BX475. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 475mm stroke, force, and G1/4 port.
This double-acting cylinder features a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX475
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX475 replacement — usually within 7-8 hours.