This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X320S, 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 SI63X320S
The AirTAC Airtac SI63 Standard Cylinder SI63X320S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 320mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X320S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke320 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X320S
- 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 SI63X320S
The AirTAC SI63X320S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 320 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X320S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force and accessories.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked. The -S suffix means a piston magnet for CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X320S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X320S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X320S |
| Bore size | Ø63 mm |
| Stroke | 320 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 SAI63X320S 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 SAI63X320S 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 SI63X320S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×320 | 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 SI63X320S Is Used
Pallet Diverting
Pushes heavy pallets sideways on a conveyor line, utilizing the 1559 N thrust and 320 mm travel to clear the main workflow efficiently.
Vertical Lift Gates
Raises and lowers access gates or material stops, where the 320 mm stroke provides ample clearance and the profile barrel resists workshop debris.
Component Ejection
Ejects machined parts from a fixture, using the adjustable end cushions to decelerate the 63 mm bore smoothly over the long 320 mm extension.
Replacing the Airtac SI63 Standard Cylinder SI63X320S with the SAI63X320S
To replace the SI63X320S, order the SAI63X320S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the G3/8 port, the M16x1.5 rod thread and the -S magnet for legacy CS1-B/DS1-B switches. If you need more force, the 80 mm bore yields 2513 N at 0.5 MPa; if less is required, the 50 mm bore gives 982 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. Because the 320 mm stroke is long, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X320S
- ✓ 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 SI63X320S FAQ
Yes, the SI63X320S is discontinued. The direct replacement is the AirTAC SAI63X320S. It features the same ISO 15552 mounting interface, 63 mm bore, 320 mm stroke, output force and G3/8 port, so it drops directly into existing fixtures.
The bore is 63 mm with a G3/8 air port. At 0.5 MPa it pushes 1559 N and pulls 1402 N. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X320S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X320S replacement — usually within 7-8 hours.