This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX225S, 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 SI50AX225S
The AirTAC Airtac SI50 Standard Cylinder SI50AX225S 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 SAI50AX225S, 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 → SAI50AX225S
- 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 SI50AX225S
The AirTAC SI50AX225S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 225mm stroke, and a SUS420J2 stainless steel rod. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50AX225S, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet supports CS1-B/DS1-B sensors, while SAIL and BSAI lock variants the SI lacked are now available.
Airtac SI50 Standard Cylinder SI50AX225S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX225S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX225S |
| 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 SAI50AX225S 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 SAI50AX225S 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 SI50AX225S
| 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 SI50AX225S Is Used
Stainless Rod Diverters
The SUS420J2 rod resists moisture on washdown conveyor diverters, providing 982N push to redirect packages reliably.
Mid-Force Clamp Arms
Delivers 825N pull at 0.5MPa to hold medium workpieces during machining, with the 225mm stroke reaching deep into fixtures.
Replacing the Airtac SI50 Standard Cylinder SI50AX225S with the SAI50AX225S
To replace the SI50AX225S, order the SAI50AX225S. Confirm the ISO 15552 mounting interface, 50mm bore, 225mm stroke (non-standard), G1/4 port, and mounting accessory. The -A rod is SUS420J2 stainless, and -S provides a magnet for CS1-B/DS1-B switches. Neighbouring bores: 40mm gives 628N push, 63mm gives 1559N at 0.5MPa. As 225mm exceeds standard strokes, ensure guides prevent rod bending. A plain cylinder drifts without air; for load holding use SAIL, BSAI, or a pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX225S
- ✓ 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 SI50AX225S FAQ
Yes, the SI50AX225S is discontinued. The direct replacement is the SAI50AX225S. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 225mm stroke, G1/4 port, and mounting interface for existing fixtures.
The G1/4 port feeds a 50mm bore yielding 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX225S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX225S replacement — usually within 7-8 hours.