This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX25S, 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 SI63BX25S
The AirTAC Airtac SI63 Standard Cylinder SI63BX25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX25S
- 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 SI63BX25S
The AirTAC SI63BX25S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 25 mm stroke, and a SUS304 stainless steel rod. Delivering 1559 N push force at 0.5 MPa, it is replaced by the SAI63BX25S. This direct successor shares the exact ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI63 Standard Cylinder SI63BX25S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX25S |
| Bore size | Ø63 mm |
| Stroke | 25 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 SAI63BX25S 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 SAI63BX25S 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 SI63BX25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×25 | 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 SI63BX25S Is Used
Stainless Rod Clamping
Short 25 mm stroke and SUS304 rod excel in compact clamping tasks within washdown or mildly corrosive environments.
Transfer Line Diverter
Provides 1559 N push at 0.5 MPa to actuate diverters on packaging conveyors, fitting neatly into ISO 15552 fixtures.
Pallet Stop Gate
Reliable stopping force for light pallets, using the built-in magnet and CS1-B/DS1-B switches for position confirmation.
Replacing the Airtac SI63 Standard Cylinder SI63BX25S with the SAI63BX25S
To replace the SI63BX25S, order the SAI63BX25S, confirming the ISO 15552 interface, 63 mm bore, 25 mm stroke, G3/8 port, and SUS304 rod. The -S magnet supports CS1-B/DS1-B sensors. If you need more force, the 80 mm bore yields 2513 N push at 0.5 MPa; if less is needed, the 50 mm bore yields 982 N. For load holding on air loss, note that a plain cylinder drifts; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The cushion only decelerates near stroke end.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX25S
- ✓ 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 SI63BX25S FAQ
Yes, the SI63BX25S is discontinued. The direct replacement is the SAI63BX25S, which maintains the same ISO 15552 mounting interface, 63 mm bore, 25 mm stroke, force, and G3/8 port.
It features a G3/8 port and delivers 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX25S replacement — usually within 7-8 hours.