This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX225S, 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 SI63AX225S
The AirTAC Airtac SI63 Standard Cylinder SI63AX225S 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 SAI63AX225S, 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 → SAI63AX225S
- 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 SI63AX225S
The AirTAC SI63AX225S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 225mm stroke, and a SUS420J2 stainless piston rod. It delivers 1559N push and 1402N pull at 0.5MPa, operating through a G3/8 port. AirTAC replaced this legacy unit with the SAI63AX225S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the SAI family introduces SAIL, SAIF, and BSAI lock variants the SI line lacked. This magnet-equipped model accepts CS1-B/DS1-B switches, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63AX225S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX225S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX225S |
| 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 SAI63AX225S 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 SAI63AX225S 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 SI63AX225S
| 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 SI63AX225S Is Used
Stainless Rod Actuation
Ideal for packaging machinery requiring the SUS420J2 stainless piston rod to resist moisture while providing 1559N push force at 0.5MPa for clamping operations.
Material Diversion
Drives 225mm stroke diverters on transfer lines, utilizing the adjustable air cushions to decelerate loads smoothly at 30-800mm/s operating speeds.
Replacing the Airtac SI63 Standard Cylinder SI63AX225S with the SAI63AX225S
To replace the discontinued SI63AX225S, order the SAI63AX225S, confirming the ISO 15552 mounting interface, 63mm bore, 225mm stroke, G3/8 port, and the -S magnet for current AirTAC switches. The -A rod denotes SUS420J2 stainless steel; specify this material on the SAI if corrosion resistance is required. Sizing both ways: the 63mm bore yields 1559N push at 0.5MPa, while the adjacent 50mm bore yields 982N, and the 80mm yields 2513N. For loads needing 225mm of travel, add external guides to prevent rod bending. A plain cylinder does not hold load without live air; the cushion only decelerates. For secure holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX225S
- ✓ 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 SI63AX225S FAQ
Yes, the SI63AX225S is discontinued. The direct replacement is the SAI63AX225S. It shares the identical ISO 15552 mounting interface, 63mm bore, 225mm stroke, output force, G3/8 port, and SUS420J2 stainless rod, fitting existing fixtures perfectly.
This double-acting cylinder uses a G3/8 air port. The thrust ratings are 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX225S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX225S replacement — usually within 7-8 hours.