This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X450FA, 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 SI63X450FA
The AirTAC Airtac SI63 Standard Cylinder SI63X450FA 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 SAI63X450FA, 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 → SAI63X450FA
- 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 SI63X450FA
The AirTAC SI63X450FA is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 450 mm stroke. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is replaced by the SAI63X450FA. This direct upgrade shares the exact FA flange mounting interface, bore, and output force.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63X450FA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X450FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X450FA |
| 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 SAI63X450FA 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 SAI63X450FA 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 SI63X450FA
| 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 SI63X450FA Is Used
Long-Stroke Ejector
Pushes completed parts out of a machining center using the 1559 N force and 450 mm travel, requiring external guides to manage the extended rod length safely.
Pallet Diverter
Actuates a diverter arm on a packaging line, utilizing the FA flange mount to secure the body while moving moderate loads between belts.
Replacing the Airtac SI63 Standard Cylinder SI63X450FA with the SAI63X450FA
To replace the SI63X450FA, order the SAI63X450FA. Confirm the ISO 15552 FA flange interface, 63 mm bore, 450 mm stroke, M16x1.5 rod thread, and G3/8 port (PT/G/NPT options). For sizing, a 50 mm bore gives 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. This non-magnet SKU cannot take a sensor. Because stroke is 450 mm, use external guides to prevent rod bending and side loads. The cushion only decelerates; for load holding on air loss, use an external rod lock or pilot check valve, or specify the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X450FA
- ✓ 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 SI63X450FA FAQ
Yes, the SI63X450FA is discontinued. The direct replacement is the SAI63X450FA. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 450 mm stroke, G3/8 port, and FA flange mounting interface.
This double-acting cylinder uses a G3/8 port and delivers 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X450FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X450FA replacement — usually within 7-8 hours.