This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX225, 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 SI50AX225
The AirTAC Airtac SI50 Standard Cylinder SI50AX225 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 225mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX225, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX225
- 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 SI50AX225
The AirTAC SI50AX225 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 225mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, its direct replacement is the SAI50AX225, retaining identical mounting and output. This specific SKU features a SUS420J2 stainless steel rod (-A) but lacks a magnet, meaning it cannot accept position sensors.
The SAI50AX225 upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For load holding, note that standard cylinders drift without live air; use a pilot check valve or the SAIL/BSAI lock variants.
Airtac SI50 Standard Cylinder SI50AX225 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX225 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX225 |
| Bore size | Ø50 mm |
| Stroke | 225 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 SAI50AX225 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 SAI50AX225 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 SI50AX225
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×225 | 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 SI50AX225 Is Used
Stainless Rod Actuation
Ideal for moderate washdown or moisture-prone assembly lines utilizing the SUS420J2 stainless piston rod to resist corrosion while pushing 982N at 0.5 MPa.
Mid-Stroke Diversion
The 225mm stroke handles diverter gates or mid-length product transfers on conveyor systems where a non-magnetic, double-acting profile cylinder is sufficient.
Replacing the Airtac SI50 Standard Cylinder SI50AX225 with the SAI50AX225
To replace the discontinued SI50AX225, order the SAI50AX225, ensuring the ISO 15552 mounting interface, 50mm bore, 225mm stroke, G1/4 port, and SUS420J2 rod option match your fixture. Since this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if position detection is needed, select an SAI50AX225S. For sizing alternatives, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore offers 1559N. Because the stroke is 225mm, ensure proper guide alignment to prevent rod bending and side-load wear. The SAI family also adds SAIF (built-in valve) and SAIL/BSAI lock variants for specific control needs.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX225
- ✓ 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 SI50AX225 FAQ
Yes, the AirTAC SI50AX225 is discontinued. The direct replacement is the SAI50AX225. It is dimensionally interchangeable per ISO 15552, maintaining the same 50mm bore, 225mm stroke, 982N force, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 air port and provides 982N push / 825N pull at 0.5 MPa, 1374N push at 0.7 MPa, and 1767N push at 0.9 MPa, with a theoretical max of 200 kgf at 1.0 MPa. It uses a 30mm adjustable air cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX225
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX225 replacement — usually within 7-8 hours.