This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX325, 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 SI63AX325
The AirTAC SI63 Standard Cylinder SI63AX325 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 325mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX325, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke325 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX325
- 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 SI63AX325
The AirTAC SI63AX325 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 325mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa via a G3/8 port. AirTAC replaced this EOL unit with the SAI63AX325, a direct sharing the same interface, force, and mounting.
The SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure and long life. This SKU has an SUS420J2 stainless rod (-A) but lacks a magnet, so it cannot take a sensor.
Airtac SI63 Standard Cylinder SI63AX325 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX325 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX325 |
| Bore size | Ø63 mm |
| Stroke | 325 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 SAI63AX325 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 SAI63AX325 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 SI63AX325
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×325 | 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 SI63AX325 Is Used
Stainless Rod Actuation
The SUS420J2 rod resists corrosion in washdown handling tasks, pushing 1559N at 0.5MPa to index parts through damp environments.
Long Stroke Diversion
With a 325mm travel, this cylinder actuates large package diverters on wide conveyors, requiring external guides to manage side loads.
Replacing the Airtac SI63 Standard Cylinder SI63AX325 with the SAI63AX325
To replace the SI63AX325, order the SAI63AX325, confirming the ISO 15552 interface, 325mm stroke, G3/8 port, and SUS420J2 rod. This SKU has no magnet, so it cannot accept CS1-B/DS1-B switches. For sizing, a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. At 325mm stroke, use external guides to prevent rod bending and side-load wear. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX325
- ✓ 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 SI63AX325 FAQ
Yes, the SI63AX325 is discontinued. The direct replacement is the SAI63AX325, which shares the identical ISO 15552 mounting interface, 63mm bore, 325mm stroke, G3/8 port, and output force.
It features a G3/8 port and delivers 1559N push / 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 SAI63AX325
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX325 replacement — usually within 7-8 hours.