This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X540S, 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 SI63X540S
The AirTAC Airtac SI63 Standard Cylinder SI63X540S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 540mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X540S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke540 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X540S
- 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 SI63X540S
The AirTAC SI63X540S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 540mm stroke. Delivering 1559N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI63X540S. This direct upgrade shares identical mounting, output, and dimensions, fitting your existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix means it has a piston magnet for CS1-B/DS1-B sensors. Note that a plain cylinder drifts without air; use SAIL or BSAI lock variants for holding.
Airtac SI63 Standard Cylinder SI63X540S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X540S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X540S |
| Bore size | Ø63 mm |
| Stroke | 540 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 SAI63X540S 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 SAI63X540S 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 SI63X540S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×540 | 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 SI63X540S Is Used
Long-Stroke Diversion
Executes 540mm travel to push heavy packages between sorting lanes on a high-speed conveyor line.
Material Lowering
Lowers stacked components with a 79kg vertical lift capacity, relying on external guides to prevent rod bending.
Fixture Actuation
Drives large machining fixtures requiring 1559N of push force at 0.5MPa to clamp heavy steel workpieces.
Replacing the Airtac SI63 Standard Cylinder SI63X540S with the SAI63X540S
To replace the SI63X540S, order the SAI63X540S. Verify the ISO 15552 interface, 63mm bore, 540mm stroke, G3/8 port (PT/G/NPT thread), and mounting accessory. The -S magnet is present for CS1-B/DS1-B switches. Sizing both ways: a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. For the 540mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X540S
- ✓ 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 SI63X540S FAQ
Yes, the AirTAC SI63X540S is discontinued. The direct replacement is the SAI63X540S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 540mm stroke, G3/8 port, and mounting interface.
This double-acting cylinder features a G3/8 air port. It delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X540S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X540S replacement — usually within 7-8 hours.