This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X520S, 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 SI63X520S
The AirTAC Airtac SI63 Standard Cylinder SI63X520S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 520mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X520S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke520 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X520S
- 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 SI63X520S
The AirTAC SI63X520S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 520mm stroke. Delivering 1559N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI63X520S. This direct upgrade shares identical mounting, bore, and force specs, but adds an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure.
The SAI family introduces lock and valve variants the SI lacked, like the SAIL and BSAI. Your -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X520S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X520S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X520S |
| Bore size | Ø63 mm |
| Stroke | 520 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 SAI63X520S 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 SAI63X520S 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 SI63X520S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×520 | 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 SI63X520S Is Used
Long-Stroke Diversion
Pushes heavy pallets sideways across transfer lines using the 520mm stroke and 1559N thrust at 0.5 MPa.
Pallet Positioning
Extends to index loaded pallets into exact machining fixtures, relying on the G3/8 port for rapid actuation.
Replacing the Airtac SI63 Standard Cylinder SI63X520S with the SAI63X520S
To replace the SI63X520S, order the SAI63X520S, confirming the ISO 15552 mounting interface, 63mm bore, 520mm stroke, G3/8 port, and -S magnet. Sizing both ways: a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so use the SAIL or BSAI lock variant, or an external pilot check valve for held loads. At 520mm, prevent rod bending by using an external guide to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X520S
- ✓ 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 SI63X520S FAQ
Yes, the SI63X520S is discontinued. The direct replacement is the SAI63X520S, which is dimensionally interchangeable per ISO 15552 with the same bore, stroke, G3/8 port, and mounting interface.
The 63mm bore features a G3/8 port and delivers 1559N push / 1402N pull at 0.5 MPa, 2182N push at 0.7 MPa, 2805N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X520S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X520S replacement — usually within 7-8 hours.