This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX20S, 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 SI63BX20S
The AirTAC Airtac SI63 Standard Cylinder SI63BX20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 20mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke20 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX20S
- 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 SI63BX20S
The AirTAC SI63BX20S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 20mm stroke. It delivers 1559 N push force at 0.5 MPa, features a SUS304 stainless steel piston rod for corrosion resistance, and includes a piston magnet for legacy CS1-B/DS1-B sensors. The direct replacement is the SAI63BX20S, which shares the exact same ISO 15552 mounting interface, G3/8 port, and output force.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. If you need load holding on air loss, note that standard cushions only decelerate; you must use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX20S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX20S |
| Bore size | Ø63 mm |
| Stroke | 20 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 SAI63BX20S 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 SAI63BX20S 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 SI63BX20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×20 | 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 SI63BX20S Is Used
Stainless Clamping
Uses the SUS304 rod option to resist moisture while providing 1559 N of clamping thrust for machined parts.
Short-Stroke Diverting
20mm stroke pushes lightweight diverters or gates at up to 800 mm/s to route packages on a line.
Replacing the Airtac SI63 Standard Cylinder SI63BX20S with the SAI63BX20S
To replace the discontinued SI63BX20S, order the SAI63BX20S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 20mm stroke, the G3/8 port, and the -S magnet for current AirTAC switches. The -B SUS304 rod is retained for corrosive environments. If downsizing, a 50mm bore yields 982 N push at 0.5 MPa; if upsizing, an 80mm bore provides 2513 N. For load holding without live air, the cushion only decelerates—select the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX20S
- ✓ 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 SI63BX20S FAQ
Yes, the SI63BX20S is discontinued. The direct replacement is the SAI63BX20S. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 20mm stroke, G3/8 port, SUS304 rod, and mounting interface.
The G3/8 port bore 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 max of 318 kgf at 1.0 MPa. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX20S replacement — usually within 7-8 hours.