This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX300S, 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 SI63BX300S
The AirTAC Airtac SI63 Standard Cylinder SI63BX300S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 300mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX300S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke300 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX300S
- 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 SI63BX300S
The AirTAC SI63BX300S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 300 mm stroke. It delivers 1559 N push force at 0.5 MPa, features a SUS304 stainless steel piston rod, and includes a piston magnet for position sensing. The direct replacement is the SAI63BX300S, which matches the original G3/8 port, M16x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts without live air; for load holding, consider the SAIL lock or BSAI clamp-lock variants. The original -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63BX300S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX300S |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAI63BX300S 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 SAI63BX300S 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 SI63BX300S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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 SI63BX300S Is Used
Material Diversion
Actuates routing gates on stainless washdown conveyors, utilizing the 1559 N push force and SUS304 rod for corrosion resistance.
Press Ejection
Ejects formed parts from stainless machinery, where the 1402 N pull force at 0.5 MPa reliably clears the work area.
Replacing the Airtac SI63 Standard Cylinder SI63BX300S with the SAI63BX300S
To replace the SI63BX300S, order the SAI63BX300S. Confirm the ISO 15552 mounting interface, 63 mm bore, 300 mm stroke, G3/8 port, and the SUS304 stainless rod (-B). Because the stroke is 300 mm, use external guides to prevent rod bending and side-load damage. For sizing, the 63 mm bore yields 1559 N push at 0.5 MPa; if less force is needed, a 50 mm bore provides 982 N, or an 80 mm bore offers 2513 N. A plain cylinder does not hold load without air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX300S
- ✓ 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 SI63BX300S FAQ
Yes, the SI63BX300S is discontinued. The direct replacement is the SAI63BX300S. It features the same ISO 15552 mounting interface, 63 mm bore, 300 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 63 mm bore features a G3/8 air port and M16x1.5 rod thread. It delivers 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 SAI63BX300S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX300S replacement — usually within 7-8 hours.