This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X225S, 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 SI63X225S
The AirTAC Airtac SI63 Standard Cylinder SI63X225S 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 SAI63X225S, 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 → SAI63X225S
- 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 SI63X225S
The AirTAC SI63X225S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 225mm stroke, delivering 1559 N push force at 0.5 MPa. AirTAC replaced it with the SAI63X225S, a direct upgrade retaining the exact interface, port, and force.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. The original SI utilized CS1-B/DS1-B sensors, while the SAI family introduces SAIL and BSAI lock variants previously unavailable.
Airtac SI63 Standard Cylinder SI63X225S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X225S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X225S |
| 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 SAI63X225S 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 SAI63X225S 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 SI63X225S
| 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 SI63X225S Is Used
Clamp Actuation
Drives medium-duty machining clamps requiring 1559 N of push force at 0.5 MPa to secure steel billets.
Package Diversion
Powers a 225mm stroke diverting arm on a packaging line to route heavy cartons at 30-800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63X225S with the SAI63X225S
To replace the SI63X225S, order the SAI63X225S. Confirm the ISO 15552 mounting interface, 63mm bore, 225mm stroke, G3/8 port, and the -S magnet for current AirTAC switches. If sizing down, a 50mm bore yields 982 N push at 0.5 MPa; sizing up to 80mm provides 2513 N. Because stroke is 225mm, ensure guide alignment to prevent rod bending. A plain cylinder drifts on air loss, so use an external rod lock or pilot check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X225S
- ✓ 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 SI63X225S FAQ
Yes, the SI63X225S is discontinued. The direct replacement is the AirTAC SAI63X225S. It matches the ISO 15552 mounting interface, 63mm bore, 225mm stroke, force, and G3/8 port for a direct fixture fit.
The 63mm bore features a G3/8 port. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a max force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X225S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X225S replacement — usually within 7-8 hours.