This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X450SN, 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 SI63X450SN
The AirTAC Airtac SI63 Standard Cylinder SI63X450SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 450mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X450SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke450 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X450SN
- 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 SI63X450SN
The AirTAC SI63X450SN is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 450 mm stroke. It delivers 1559 N push and 1402 N pull at 0.5 MPa, operating through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X450SN, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -N suffix denotes NBR seals (-20 to +70 C), though a Viton H option extends this to 150 C.
Because this is a 450 mm stroke, external guides are recommended to prevent rod bending under side loads. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock or valve variants the SI lacked.
Airtac SI63 Standard Cylinder SI63X450SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X450SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X450SN |
| Bore size | Ø63 mm |
| Stroke | 450 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 SAI63X450SN 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 SAI63X450SN 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 SI63X450SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×450 | 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 SI63X450SN Is Used
Carton Diverting
Drives a 450 mm diverting arm on a packaging line, providing 1559 N at 0.5 MPa to push heavy cardboard cartons smoothly onto parallel conveyors.
Material Lowering
Acts as a vertical descent damper for 79 kg material racks, using adjustable air cushions to decelerate the load smoothly over the long 450 mm travel.
Pallet Handling
Extends to push palletized goods onto accumulation rollers, where the 63 mm bore force and ISO 15552 mounting endure high-cycle logistics operations.
Replacing the Airtac SI63 Standard Cylinder SI63X450SN with the SAI63X450SN
To replace the discontinued SI63X450SN, order the SAI63X450SN. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC, etc.), the G3/8 port thread (PT/G/NPT), and the -S magnet for current AirTAC switch compatibility. When sizing, verify both directions: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. For this 450 mm stroke, use external guides to mitigate rod-bending side loads. Note that standard cylinders drift on air loss; the cushion only decelerates. For load holding, specify an external pilot check valve, rod lock, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X450SN
- ✓ 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 SI63X450SN FAQ
Yes, the SI63X450SN is discontinued. The direct replacement is the SAI63X450SN. It shares the identical ISO 15552 mounting interface, 63 mm bore, 450 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 63 mm bore uses a G3/8 port. It generates 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 max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X450SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X450SN replacement — usually within 7-8 hours.