This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX450, 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 SI63BX450
The AirTAC Airtac SI63 Standard Cylinder SI63BX450 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 SAI63BX450, 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 → SAI63BX450
- 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 SI63BX450
The AirTAC SI63BX450 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 via a G3/8 port. The direct replacement is the SAI63BX450, matching the bore, stroke, force, port and ISO 15552 mounting interface. This SKU features a SUS304 stainless piston rod (-B) for corrosion resistance but lacks a magnet, so it cannot accept position sensors.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. If higher temperatures are needed, Viton H seals raise the limit to 150 C. For load-holding on air loss, use the SAIL or BSAI lock variants, as cushions only decelerate.
Airtac SI63 Standard Cylinder SI63BX450 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX450 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX450 |
| 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 SAI63BX450 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 SAI63BX450 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 SI63BX450
| 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 SI63BX450 Is Used
Diverting Heavy Goods
Drives routing arms on packaging lines, using the 1559 N push force to shift loaded pallets or crates reliably at 0.5 MPa.
Stainless Rod Lowering
Lowers components in wash-down material handling stations, leveraging the SUS304 rod option to resist moisture and corrosion over the 450 mm travel.
Long-Reach Pushing
Executes 450 mm transfer strokes in automated warehousing, requiring external guide rails to support the extended rod and prevent binding.
Replacing the Airtac SI63 Standard Cylinder SI63BX450 with the SAI63BX450
To replace the SI63BX450, order the SAI63BX450 to retain the exact 63 mm bore, 450 mm stroke, G3/8 port, M16x1.5 rod thread and ISO 15552 mounting interface. Because this is a no-S SKU without a magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, switch to an SAI model with a magnet and current AirTAC switches. At 0.5 MPa the 63 mm bore yields 1559 N push and 1402 N pull; if undersizing, a 50 mm bore offers 982 N, and if oversizing, an 80 mm bore provides 2513 N. For the 450 mm stroke, use external guides to prevent rod bending and side-load damage. Finally, a plain cylinder drifts on air loss—install an external rod lock or pilot check valve, or specify the SAIL/BSAI lock variant for secure load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX450
- ✓ 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 SI63BX450 FAQ
Yes, the SI63BX450 is discontinued. The direct replacement is the SAI63BX450. It shares the same ISO 15552 mounting interface, 63 mm bore, 450 mm stroke, output force, G3/8 port and accessories, fitting directly into existing fixtures.
The 63 mm bore uses a G3/8 air 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 maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX450
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX450 replacement — usually within 7-8 hours.