This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX550SH, 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 SI63BX550SH
The AirTAC Airtac SI63 Standard Cylinder SI63BX550SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 550mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX550SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke550 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX550SH
- 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 SI63BX550SH
The AirTAC SI63BX550SH is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 550 mm stroke. It delivers 1559 N push force at 0.5 MPa, features a SUS304 stainless steel rod, a Viton H high-temperature seal (0 to 150 C), and a G3/8 port. The direct replacement is the SAI63BX550SH, matching the bore, stroke, force, 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. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63BX550SH Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX550SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX550SH |
| Bore size | Ø63 mm |
| Stroke | 550 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 SAI63BX550SH 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 SAI63BX550SH 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 SI63BX550SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×550 | 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 SI63BX550SH Is Used
High-Temp Forming Press
Ideal for actuating tooling in heated environments up to 150 C using the Viton H seal and SUS304 rod for corrosion resistance.
Long-Stroke Diversion
Provides the 550 mm travel needed to reroute heavy packages on a manufacturing line, delivering 1559 N push force at 0.5 MPa.
Replacing the Airtac SI63 Standard Cylinder SI63BX550SH with the SAI63BX550SH
To replace the discontinued SI63BX550SH, order the SAI63BX550SH. Confirm the ISO 15552 mounting interface, 63 mm bore, 550 mm stroke, G3/8 port, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet enables position sensing; upgrade to current AirTAC switches for the SAI. The -B rod is SUS304 stainless, and the -H seal is Viton for 0-150 C environments. Sizing both ways: if 1559 N push at 0.5 MPa is insufficient, step up to an 80 mm bore (2513 N); if oversizing, drop to a 50 mm bore (982 N). Note that a 550 mm stroke requires external guides to prevent rod bending and side-load wear. The air cushion only decelerates; it does not hold load. For load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX550SH
- ✓ 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 SI63BX550SH FAQ
Yes, the SI63BX550SH is discontinued. The direct replacement is the SAI63BX550SH. It is dimensionally interchangeable per ISO 15552, maintaining the same 63 mm bore, 550 mm stroke, force, G3/8 port, and mounting interface.
The G3/8 port bore delivers a push force of 1559 N and pull of 1402 N at 0.5 MPa, 2182 N at 0.7 MPa, 2805 N at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX550SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX550SH replacement — usually within 7-8 hours.