This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX550, 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 SI63BX550
The AirTAC Airtac SI63 Standard Cylinder SI63BX550 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 SAI63BX550, 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 → SAI63BX550
- 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 SI63BX550
The AirTAC SI63BX550 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 550mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63BX550, matching the interface, force, and stroke. This -B variant uses a SUS304 stainless piston rod for corrosion resistance instead of standard carbon steel. Being built without a magnet (-S), this SKU cannot accept a position switch. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
A plain cylinder does not hold loads without live air; the cushions only decelerate near stroke ends. For secure holding, use an external rod lock, pilot check valve, or the SAI family's SAIL or BSAI lock variants. The SAI line also adds the SAIF variant with a built-in 4M valve. Operating pressure is 0.15-1.0MPa, with a Viton H seal option raising the temperature range to 0-150C.
Airtac SI63 Standard Cylinder SI63BX550 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX550 |
| 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 SAI63BX550 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 SAI63BX550 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 SI63BX550
| 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 SI63BX550 Is Used
Long-Stroke Diversion
Pushes heavy pallets laterally across packaging lines using the 1559N push force at 0.5MPa, with external guides preventing rod bending over the 550mm travel.
Replacing the Airtac SI63 Standard Cylinder SI63BX550 with the SAI63BX550
To replace the discontinued SI63BX550, order the SAI63BX550. It drops directly into existing ISO 15552 fixtures with the same 63mm bore, 550mm stroke, M16x1.5 rod thread, G3/8 port, and mounting accessories. If sizing up or down, neighboring bores are 50mm and 80mm. At 0.5MPa, the 50mm yields 982N push while the 80mm provides 2513N. Because this is a -B configuration, confirm the SUS304 stainless rod requirement. Note that this specific SKU lacks a magnet and cannot support legacy CS1-B/DS1-B sensors. For load holding on air loss, specify an external pilot check valve or upgrade to the SAIL/BSAI lock variant. Finally, at 550mm stroke, prevent rod bending by guiding the load externally to avoid side-load stress.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX550
- ✓ 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 SI63BX550 FAQ
Yes, the SI63BX550 is discontinued. The direct replacement is the AirTAC SAI63BX550. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 550mm stroke, G3/8 port, and mounting interface.
The 63mm bore features a G3/8 port and M16x1.5 rod thread. It provides 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum force of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX550 replacement — usually within 7-8 hours.