This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX475S, 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 SI50AX475S
The AirTAC Airtac SI50 Standard Cylinder SI50AX475S 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 SAI50AX475S, 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 → SAI50AX475S
- 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 SI50AX475S
The AirTAC SI50AX475S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 475mm stroke, and a SUS420J2 stainless steel rod. Delivering 982 N push and 825 N pull at 0.5 MPa via a G1/4 port, it is replaced by the SAI50AX475S. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, force, and accessories.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50AX475S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX475S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX475S |
| 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 SAI50AX475S 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 SAI50AX475S 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 SI50AX475S
| 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 SI50AX475S Is Used
Transfer Pushers
Actuates medium-weight workpieces along packaging lines, relying on the 982 N thrust class and adjustable 30mm end cushions to halt loads smoothly.
Stainless Rod Washdown
Employs the SUS420J2 piston rod option for light corrosive or moisture-prone environments where standard carbon steel rods would degrade.
Replacing the Airtac SI50 Standard Cylinder SI50AX475S with the SAI50AX475S
To replace the SI50AX475S, order the SAI50AX475S: it drops into the same ISO 15552 fixtures with matching 50mm bore, 475mm stroke, G1/4 port, M16x1.5 rod thread, and -S magnet. When sizing, the 50mm bore yields 982 N push at 0.5 MPa; stepping down to a 40mm bore drops this to 628 N, while stepping up to 63mm raises it to 1559 N. Because this is a 475mm stroke, use an external guide to prevent rod-bending and side-load wear. The -A rod is SUS420J2 stainless for corrosion resistance. 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 variant. The SI -S magnet works with legacy CS1-B/DS1-B switches; the SAI uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX475S
- ✓ 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 SI50AX475S FAQ
Yes, the SI50AX475S is discontinued. The direct replacement is the AirTAC SAI50AX475S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 475mm stroke, 982 N output force, G1/4 port, and mounting interface, so it fits existing fixtures directly.
The bore is 50mm with a G1/4 air port and M16x1.5 rod thread. The thrust is 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 maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX475S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX475S replacement — usually within 7-8 hours.