This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X325, 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 SI63X325
The AirTAC Airtac SI63 Standard Cylinder SI63X325 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 SAI63X325, 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 → SAI63X325
- 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 SI63X325
The AirTAC SI63X325 is a discontinued double-acting ISO 15552 profile cylinder with a 325 mm stroke. Delivering 1559 N push force at 0.5 MPa through a G3/8 port, it is replaced by the SAI63X325. This direct successor shares the exact ISO 15552 mounting interface, bore, and stroke, fitting existing fixtures perfectly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SKU lacks a magnet (-S), it cannot accept a position sensor.
Airtac SI63 Standard Cylinder SI63X325 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X325 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X325 |
| 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 SAI63X325 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 SAI63X325 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 SI63X325
| 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 SI63X325 Is Used
Material Diversion
Drives diverter arms on packaging lines, utilizing the 1559 N push force to reliably redirect heavy cartons at high cycling speeds.
Pallet Drop
Lowers lightweight fixtures in automated assembly cells, where the 325 mm stroke provides the necessary vertical travel distance.
Gate Actuation
Opens and closes heavy access gates on material handling systems, requiring the robust G3/8 port and 63 mm bore capacity.
Replacing the Airtac SI63 Standard Cylinder SI63X325 with the SAI63X325
To replace the SI63X325, order the SAI63X325. Verify the ISO 15552 mounting interface, the G3/8 port, and your mounting accessory (LB, FA, TC, etc.). Since this SKU has no magnet, it cannot support legacy CS1-B/DS1-B sensors; order an -S variant if sensing is needed. If you need higher force, the 80 mm bore yields 2513 N push at 0.5 MPa; if lower force is acceptable, the 50 mm bore yields 982 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variant. Finally, for this 325 mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X325
- ✓ 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 SI63X325 FAQ
Yes, the SI63X325 is discontinued. The direct replacement is the AirTAC SAI63X325. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 63 mm bore, 325 mm stroke, output force, and G3/8 port.
The 63 mm bore provides 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s. It uses a 20 mm rod, M16x1.5 thread, and 30 mm adjustable cushions.
Request a Quote for the SAI63X325
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X325 replacement — usually within 7-8 hours.