This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX225S, 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 SI63BX225S
The AirTAC Airtac SI63 Standard Cylinder SI63BX225S 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 SAI63BX225S, 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 → SAI63BX225S
- 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 SI63BX225S
The AirTAC SI63BX225S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 225 mm stroke, and a SUS304 stainless steel piston rod. Generating 1559 N push force at 0.5 MPa, it is replaced direct by the SAI63BX225S. This upgrade retains the exact G3/8 port, M16x1.5 thread, and mounting interface, but introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
The -S magnet supports legacy CS1-B/DS1-B sensors, while a Viton H seal option can elevate the operating temperature range up to 150 C.
Airtac SI63 Standard Cylinder SI63BX225S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX225S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX225S |
| 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 SAI63BX225S 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 SAI63BX225S 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 SI63BX225S
| 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 SI63BX225S Is Used
Stainless Rod Actuation
Ideal for packaging equipment requiring the -B SUS304 rod for corrosion resistance while delivering 1559 N push force.
Material Diversion
Provides robust 225 mm stroke movement for diverting medium-weight goods along processing lines at 30-800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63BX225S with the SAI63BX225S
To replace the SI63BX225S, order the SAI63BX225S to get the exact ISO 15552 mounting interface, 63 mm bore, 225 mm stroke, and G3/8 port. Retain your existing mounting accessories and specify the -B SUS304 rod and -S magnet. At 0.5 MPa it pushes 1559 N; if undersized, the neighbouring 80 mm bore yields 2513 N. Remember a plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock variant for load holding. At 225 mm stroke, guide external rods to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX225S
- ✓ 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 SI63BX225S FAQ
Yes, the SI63BX225S is discontinued. The direct replacement is the SAI63BX225S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 225 mm stroke, force, and G3/8 port, fitting existing fixtures perfectly while upgrading the piston seal.
It features a G3/8 air port. The force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa. The speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX225S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX225S replacement — usually within 7-8 hours.