This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX225, 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 SI63AX225
The AirTAC Airtac SI63 Standard Cylinder SI63AX225 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 SAI63AX225, 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 → SAI63AX225
- 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 SI63AX225
The AirTAC SI63AX225 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 225mm stroke, and an SUS420J2 stainless piston rod. Delivering 1559N push force at 0.5MPa, it is replaced by the SAI63AX225. This direct upgrade shares the same G3/8 port, M16x1.5 thread, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a CS1-B/DS1-B sensor. For load holding, use the SAIL lock or BSAI clamp-lock variant.
Airtac SI63 Standard Cylinder SI63AX225 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX225 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX225 |
| 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 SAI63AX225 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 SAI63AX225 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 SI63AX225
| 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 SI63AX225 Is Used
Stainless Rod Actuation
Ideal for packaging or washdown stations needing the SUS420J2 rod option to resist moisture while providing 1559N push force.
Mid-Stroke Diverting
The 225mm stroke handles precise lane changing or diverting tasks on production lines without requiring full extension.
Material Handling Gates
Drives heavy guard doors or sorting flaps using its 79kg safe vertical lift capacity at standard 0.5MPa pressure.
Replacing the Airtac SI63 Standard Cylinder SI63AX225 with the SAI63AX225
To replace the SI63AX225, order the SAI63AX225. Verify your ISO 15552 mounting (LB, FA, TC, etc.), the G3/8 port, and the M16x1.5 rod thread. Because this is a no-S SKU, it cannot accept position sensors; if switching is needed, order the SAI63AX225S. For sizing, a 50mm bore yields 982N push @0.5MPa, while an 80mm bore yields 2513N. A plain cylinder drifts on air loss, so for load holding select the SAIL or BSAI lock variant, or add a pilot check valve. At 225mm stroke, side-load is low, but ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX225
- ✓ 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 SI63AX225 FAQ
Yes, the SI63AX225 is discontinued. The direct replacement is the SAI63AX225. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 225mm stroke, G3/8 port, and mounting interface.
It features a G3/8 air port. The force ratings are: 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX225
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX225 replacement — usually within 7-8 hours.