This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX325, 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 SI63BX325
The AirTAC Airtac SI63 Standard Cylinder SI63BX325 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 SAI63BX325, 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 → SAI63BX325
- 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 SI63BX325
The AirTAC SI63BX325 is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 325 mm stroke, and a SUS304 stainless steel piston rod. Delivering 1559 N push force at 0.5 MPa via its G3/8 port, it is replaced by the direct replacement SAI63BX325. This upgrade retains identical ISO 15552 mounting dimensions, bore, stroke, and output force, fitting existing fixtures perfectly.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a magnet (-S) and cannot accept position sensors; the legacy SI family used CS1-B/DS1-B switches.
Airtac SI63 Standard Cylinder SI63BX325 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX325 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX325 |
| 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 SAI63BX325 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 SAI63BX325 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 SI63BX325
| 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 SI63BX325 Is Used
Stainless Rod Diverters
Ideal for diverting goods on washdown conveyor lines where the SUS304 rod resists moisture and the 1559 N force easily pushes heavy cartons.
Vertical Package Lifts
With a safe vertical lift capacity around 79 kg at 0.5 MPa, this 325 mm stroke cylinder raises packaged goods between warehouse tiers.
Long-Stroke Guiding
Used to actuate external slide guides over 325 mm distances in assembly machines, preventing rod bending by carrying the load on rails.
Replacing the Airtac SI63 Standard Cylinder SI63BX325 with the SAI63BX325
To replace the SI63BX325, order the SAI63BX325. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the 325 mm stroke, and the G3/8 port. Because this unit has a -B SUS304 stainless rod, verify if your environment still requires it or if the standard carbon-steel rod suffices. This SKU has no magnet, so it cannot support CS1-B/DS1-B sensors; if sensing is needed, order an SAI with the S suffix. For sizing, the 63 mm bore gives 1559 N push at 0.5 MPa; dropping to a 50 mm bore reduces push to 982 N, while increasing to 80 mm yields 2513 N. At 325 mm stroke, prevent rod bending by guiding the load externally to avoid side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX325
- ✓ 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 SI63BX325 FAQ
Yes, the SI63BX325 is discontinued. The direct replacement is the AirTAC SAI63BX325. It shares the same ISO 15552 mounting interface, 63 mm bore, 325 mm stroke, output force, and G3/8 port, fitting directly into existing fixtures.
The G3/8 port feeds a cylinder generating 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa push is 2182 N, and 2805 N at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX325
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX325 replacement — usually within 7-8 hours.