This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X440S, 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 SI63X440S
The AirTAC Airtac SI63 Standard Cylinder SI63X440S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 440mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X440S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke440 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X440S
- 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 SI63X440S
The AirTAC SI63X440S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 440 mm stroke. It delivers 1559 N push force at 0.5 MPa and features a G3/8 air port. AirTAC replaced this legacy unit with the SAI63X440S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, port and mounting accessories.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For applications needing load holding, the SAI family adds SAIL and BSAI lock variants the SI lacked. The built-in magnet supports CS1-B/DS1-B switches.
Airtac SI63 Standard Cylinder SI63X440S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X440S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X440S |
| Bore size | Ø63 mm |
| Stroke | 440 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 SAI63X440S 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 SAI63X440S 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 SI63X440S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×440 | 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 SI63X440S Is Used
Package Diverting
Drives diverter arms on sorting lines, using the 440 mm stroke to push parcels cleanly between adjacent conveyor belts.
Pallet Positioning
Indexes empty pallets into a wrapping station, providing reliable 1559 N push force to square up loads before stretch wrapping.
Material Lowering
Acts as a gravity counterbalance for lowering heavy fixtures, requiring external guides to prevent rod bending over the 440 mm extension.
Replacing the Airtac SI63 Standard Cylinder SI63X440S with the SAI63X440S
To replace the SI63X440S, order the SAI63X440S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G3/8 port, and the M16x1.5 rod thread. The -S magnet is retained for current AirTAC switches. For sizing, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 440 mm stroke, prevent rod bending by using external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X440S
- ✓ 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 SI63X440S FAQ
Yes, the SI63X440S is discontinued. The direct replacement is the AirTAC SAI63X440S. It shares the same ISO 15552 mounting interface, 63 mm bore, 440 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
At 0.5 MPa, push force is 1559 N and pull is 1402 N. Push force is 2182 N at 0.7 MPa, 2805 N at 0.9 MPa, with a theoretical max of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, and it uses a G3/8 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X440S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X440S replacement — usually within 7-8 hours.