This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X450, 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 SI63X450
The AirTAC Airtac SI63 Standard Cylinder SI63X450 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 SAI63X450, 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 → SAI63X450
- 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 SI63X450
The AirTAC SI63X450 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 450 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X450, a direct upgrade sharing the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30 mm cushions.
The SAI successor features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot hold a load without live air; the cushion only decelerates. For locking needs, explore the SAIL or BSAI variants.
Airtac SI63 Standard Cylinder SI63X450 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X450 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X450 |
| 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 SAI63X450 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 SAI63X450 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 SI63X450
| 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 SI63X450 Is Used
Transfer Line Diverters
Actuates routing gates on packaging conveyors, utilizing the 1559 N push force at 0.5 MPa to reliably shift heavy product flows between parallel belts.
Pallet Lift Stations
Raises lower-tier pallets in distribution hubs; the 450 mm stroke provides the elevation gap needed for forklift entry while maintaining a 79 kg vertical lift margin.
Long-Reach Clamping Arms
Extends tooling arms in CNC machining cells where the extended 450 mm stroke is required to clear large workpiece envelopes before applying clamp force.
Replacing the Airtac SI63 Standard Cylinder SI63X450 with the SAI63X450
To replace the discontinued SI63X450, order the SAI63X450. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC), the G3/8 port, and the M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if position detection is needed. At 0.5 MPa the 63 mm bore yields 1559 N push and 1402 N pull; if undersized, the 80 mm bore provides 2513 N push. The 450 mm stroke demands external guides to prevent rod bending and side-load wear. For load holding on air loss, add an external pilot check valve or rod lock, as the cushion only decelerates.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X450
- ✓ 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 SI63X450 FAQ
Yes, the SI63X450 is discontinued. The direct replacement is the AirTAC SAI63X450. It shares the identical ISO 15552 mounting interface, 63 mm bore, 450 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly while adding an upgraded piston seal.
The 63 mm bore uses a G3/8 air port. Force output is 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 maximum of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI63X450
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X450 replacement — usually within 7-8 hours.