This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX550S, 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 SI63BX550S
The AirTAC Airtac SI63 Standard Cylinder SI63BX550S 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 SAI63BX550S, 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 → SAI63BX550S
- 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 SI63BX550S
The AirTAC SI63BX550S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 550 mm stroke, and a SUS304 stainless steel piston rod. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX550S, matching the interface, bore, stroke, and force perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. This -S model includes a magnet for CS1-B/DS1-B sensors, while the SAI accepts current AirTAC switches.
Airtac SI63 Standard Cylinder SI63BX550S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX550S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX550S |
| 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 SAI63BX550S 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 SAI63BX550S 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 SI63BX550S
| 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 SI63BX550S Is Used
Long-Stroke Diversion
Drives large package pushers on sorting lines, utilizing the 550 mm stroke to shift heavy goods between parallel conveyor belts reliably.
Pallet Handling
Actuates pallet lifting and positioning stops in automated storage systems, where the 1559 N force and SUS304 rod endure demanding environments.
Vertical Lowering
Controls the gravity-fed descent of material chutes, using adjustable air cushions to decelerate the load smoothly at the end of the 550 mm stroke.
Replacing the Airtac SI63 Standard Cylinder SI63BX550S with the SAI63BX550S
To replace the SI63BX550S, order the SAI63BX550S. Verify the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and the -S magnet requirement. The -B designation indicates a SUS304 rod for corrosion resistance. For sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, whereas an 80 mm bore provides 2513 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. At 550 mm stroke, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX550S
- ✓ 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 SI63BX550S FAQ
Yes, the SI63BX550S is discontinued. The direct replacement is the SAI63BX550S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 550 mm stroke, force, G3/8 port, and mounting interface.
The bore is 63 mm with a G3/8 air port. The thrust is 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 SAI63BX550S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX550S replacement — usually within 7-8 hours.