This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X420S, 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 SI63X420S
The AirTAC Airtac SI63 Standard Cylinder SI63X420S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 420mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X420S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke420 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X420S
- 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 SI63X420S
The AirTAC SI63X420S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 420 mm stroke, and a G3/8 air port. Generating 1559 N of push force at 0.5 MPa, it is replaced by the SAI63X420S. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, output force, port, and accessories, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked. Because this is a 420 mm stroke, use external guides to prevent rod bending. The -S magnet works with CS1-B/DS1-B sensors, and Viton H seals raise the temperature limit to 150 C.
Airtac SI63 Standard Cylinder SI63X420S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X420S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X420S |
| Bore size | Ø63 mm |
| Stroke | 420 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 SAI63X420S 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 SAI63X420S 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 SI63X420S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×420 | 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 SI63X420S Is Used
Material Diversion
Actuates routing gates on conveyor lines, utilizing the 1559 N push force to shift heavy packages reliably at 0.5 MPa.
Pallet Handling
Drives 420 mm stroke lifting arms for pallet positioning, requiring external guides to prevent rod bending over the long travel.
Replacing the Airtac SI63 Standard Cylinder SI63X420S with the SAI63X420S
To replace the SI63X420S, order the SAI63X420S, confirming the ISO 15552 mounting interface, 63 mm bore, 420 mm stroke, G3/8 port, and mounting accessory. The -S magnet allows CS1-B/DS1-B switches, though the SAI replacement uses current AirTAC switches. If sizing down, a 50 mm bore yields 982 N push at 0.5 MPa; sizing up to 80 mm provides 2513 N. For a 420 mm stroke, add external guides to manage side-load and rod-bending risks. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X420S
- ✓ 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 SI63X420S FAQ
Yes, the AirTAC SI63X420S is discontinued. The direct replacement is the SAI63X420S, which shares the same ISO 15552 mounting interface, 63 mm bore, 420 mm stroke, output force, and G3/8 port.
It features a G3/8 air port and generates 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N 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 SAI63X420S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X420S replacement — usually within 7-8 hours.