This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX450S, 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 SI63BX450S
The AirTAC Airtac SI63 Standard Cylinder SI63BX450S 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 SAI63BX450S, 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 → SAI63BX450S
- 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 SI63BX450S
The AirTAC SI63BX450S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 450 mm stroke. It features a SUS304 stainless steel piston rod, delivering 1559 N push force at 0.5 MPa through its G3/8 port. The direct replacement is the SAI63BX450S, matching the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family also adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63BX450S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX450S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX450S |
| 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 SAI63BX450S 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 SAI63BX450S 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 SI63BX450S
| 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 SI63BX450S Is Used
Diverting Gate Actuation
Drives heavy routing flaps on packaging lines, utilizing the 1559 N push force to reliably redirect filled totes at high cycling speeds.
Stainless Press Platen
Applies consistent downward clamping pressure in food-grade washdown environments, leveraging the SUS304 rod for corrosion resistance.
Pallet Stopper Arm
Extends 450 mm to halt inbound pallets at loading docks, absorbing kinetic energy via adjustable air cushions at stroke end.
Replacing the Airtac SI63 Standard Cylinder SI63BX450S with the SAI63BX450S
To replace the SI63BX450S, order the SAI63BX450S. Verify the ISO 15552 mounting interface, 63 mm bore, 450 mm stroke, G3/8 port, and your specific mounting accessory. Retain the -B SUS304 stainless rod and -S magnet for current AirTAC switches. If sizing alternatives, neighboring bores (50 mm or 80 mm) offer 982 N or 2513 N push at 0.5 MPa. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 450 mm stroke is long, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX450S
- ✓ 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 SI63BX450S FAQ
Yes, the SI63BX450S is discontinued. The direct replacement is the SAI63BX450S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 450 mm stroke, G3/8 port, and mounting interface, so it fits existing fixtures directly.
This double-acting cylinder uses a G3/8 air port. The thrust ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX450S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX450S replacement — usually within 7-8 hours.