This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX225, 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 SI63 Standard Cylinder SI63BX225
The AirTAC SI63 Standard Cylinder SI63BX225 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 225mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX225, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke225 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX225
- 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 SI63 Standard Cylinder SI63BX225
The AirTAC SI63BX225 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 225 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63BX225, which shares the exact same interface, stroke, force and mounting dimensions. This specific SKU features a SUS304 stainless steel piston rod for corrosion resistance, but because it lacks a magnet, it cannot accept position sensors.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. If high-temperature operation is needed, a Viton H seal option raises the operating range to 0-150 C.
Airtac SI63 Standard Cylinder SI63BX225 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX225 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX225 |
| Bore size | Ø63 mm |
| Stroke | 225 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63BX225 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63BX225 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63BX225
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | 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 SI63 Standard Cylinder SI63BX225 Is Used
Stainless Rod Clamping
Ideal for packaging or food-grade machinery where the SUS304 rod resists washdown corrosion while providing 1559 N of clamping thrust.
Material Diversion
Provides reliable 225 mm stroke actuation to divert packages on a line, utilizing the adjustable air cushions for smooth end-of-stroke deceleration.
Replacing the Airtac SI63 Standard Cylinder SI63BX225 with the SAI63BX225
To replace the SI63BX225, order the SAI63BX225 and confirm the ISO 15552 mounting interface, 225 mm stroke, G3/8 port and your specific mounting accessory (LB, FA, TC, etc.). Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, select an SAI model with the S suffix. For sizing alternatives, the neighbouring 80 mm bore yields 2513 N push at 0.5 MPa, while dropping to a 50 mm bore reduces it to 982 N. A plain cylinder does not hold load without live air—the cushion only decelerates—so for load holding consider the SAIL lock, BSAI clamp-lock variant, or an external pilot check valve. At 225 mm stroke, side-load and rod-bending risks are minimal, but always guide the load to prevent shaft damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX225
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63BX225 FAQ
Yes, the SI63BX225 is discontinued. The direct replacement is the AirTAC SAI63BX225. It is dimensionally interchangeable per ISO 15552, maintaining the same 63 mm bore, 225 mm stroke, G3/8 port and mounting interface. You simply order the SAI equivalent for a seamless fixture fit.
The 63 mm bore features a G3/8 air port and an M16x1.5 rod thread. It generates 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and 2805 N push at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX225
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX225 replacement — usually within 7-8 hours.