This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X720S, 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 SI63X720S
The AirTAC Airtac SI63 Standard Cylinder SI63X720S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 720mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X720S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke720 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X720S
- 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 SI63X720S
The AirTAC SI63X720S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 720 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X720S, matching the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SI-SKU's magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds lock variants like the SAIL and BSAI absent in the SI line.
Airtac SI63 Standard Cylinder SI63X720S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X720S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X720S |
| Bore size | Ø63 mm |
| Stroke | 720 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 SAI63X720S 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 SAI63X720S 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 SI63X720S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×720 | 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 SI63X720S Is Used
Long-Stroke Diversion
Pushes heavy pallets laterally across packaging lines using the full 720 mm travel.
Elevated Load Lowering
Lowers 79 kg vertical fixtures smoothly using adjustable end cushions to absorb kinetic energy.
Automated Storage Retrieval
Actuates multi-stage extractor arms in dense storage racks requiring 1559 N push force.
Replacing the Airtac SI63 Standard Cylinder SI63X720S with the SAI63X720S
To replace the SI63X720S, order the SAI63X720S. Verify the ISO 15552 mounting interface (LB, FA, CA, TC), the G3/8 port thread option (PT/G/NPT), and the built-in magnet for position sensing. Sizing checks: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Because the 720 mm stroke is long, use external guides to prevent rod bending and side-load damage. The air cushion only decelerates the piston; it does not hold load on air loss. For secure load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X720S
- ✓ 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 SI63X720S FAQ
Yes, the SI63X720S is discontinued. The direct replacement is the SAI63X720S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 720 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
It uses a G3/8 air port. Force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X720S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X720S replacement — usually within 7-8 hours.