This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX225S, 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 SI50BX225S
The AirTAC Airtac SI50 Standard Cylinder SI50BX225S 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 SAI50BX225S, 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 → SAI50BX225S
- 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 SI50BX225S
The AirTAC SI50BX225S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 225 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50BX225S, matching the bore, stroke, force, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific unit includes the -B SUS304 stainless rod for corrosion resistance and the -S magnet for legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50BX225S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX225S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX225S |
| 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 SAI50BX225S 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 SAI50BX225S 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 SI50BX225S
| 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 SI50BX225S Is Used
Stainless Rod Clamping
Ideal for clamping washdown parts where the SUS304 rod resists corrosion and the 982 N force secures components firmly.
Package Diverting
Provides reliable actuation for diverting medium-weight packages on a 225 mm stroke with position feedback via the magnet.
Replacing the Airtac SI50 Standard Cylinder SI50BX225S with the SAI50BX225S
To replace the SI50BX225S, order the SAI50BX225S. Confirm the ISO 15552 mounting interface, the 50 mm bore, 225 mm stroke, G1/4 port (PT/G/NPT thread), and your mounting accessory. The -S magnet enables current AirTAC switches, while the -B SUS304 rod provides corrosion resistance. If you need more force, the 63 mm bore offers 1559 N push at 0.5 MPa; if less is needed, the 40 mm bore gives 628 N. Because the stroke is 225 mm, ensure adequate guide support to prevent rod bending and side loads. A plain cylinder drifts on air loss, so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX225S
- ✓ 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 SI50BX225S FAQ
Yes, the SI50BX225S is discontinued. The direct replacement is the SAI50BX225S. It features the same ISO 15552 mounting interface, 50 mm bore, 225 mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
The 50 mm bore cylinder has a G1/4 air port. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX225S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX225S replacement — usually within 7-8 hours.