This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX475S, 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 SI50BX475S
The AirTAC Airtac SI50 Standard Cylinder SI50BX475S 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 SAI50BX475S, 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 → SAI50BX475S
- 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 SI50BX475S
The AirTAC SI50BX475S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 475mm stroke, SUS304 stainless piston rod, and a built-in magnet for CS1-B/DS1-B switches. Delivering 982N push force at 0.5MPa via a G1/4 port, its direct replacement is the SAI50BX475S.
The SAI upgrade retains identical ISO 15552 mounting dimensions but introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
Airtac SI50 Standard Cylinder SI50BX475S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX475S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX475S |
| 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 SAI50BX475S 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 SAI50BX475S 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 SI50BX475S
| 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 SI50BX475S Is Used
Long-Stroke Diversion
Executes 475mm package routing on conveyor lines where the SUS304 rod resists humid factory environments.
Stainless Actuation
Drives tooling stages in washdown areas, relying on the ISO 15552 mounting for rigid fixture integration.
Replacing the Airtac SI50 Standard Cylinder SI50BX475S with the SAI50BX475S
To replace the discontinued SI50BX475S, order the SAI50BX475S ensuring the ISO 15552 interface, 50mm bore, 475mm stroke, G1/4 port, and mounting accessories match your existing fixture. The -B rod (SUS304) and -S magnet must be specified to retain the legacy CS1-B/DS1-B sensors. Because this is a 475mm stroke, add external guides to prevent rod bending and side-load wear. If you need a larger bore, the 63mm version provides 1559N at 0.5MPa; if smaller, the 40mm offers 628N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX475S
- ✓ 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 SI50BX475S FAQ
Yes, the SI50BX475S is discontinued. The direct replacement is the SAI50BX475S. It is dimensionally interchangeable per ISO 15552, maintaining the same 50mm bore, 475mm stroke, G1/4 port, and mounting interface. The SAI features an upgraded two Y-shaped element piston seal for longer life.
This double-acting cylinder uses a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. The rod is 20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX475S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX475S replacement — usually within 7-8 hours.