This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X50FB, 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 SI63X50FB
The AirTAC Airtac SI63 Standard Cylinder SI63X50FB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X50FB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X50FB
- 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 SI63X50FB
The AirTAC SI63X50FB is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 50mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X50FB, a direct upgrade retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread, and output force.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the new SAI family offers SAIL lock and BSAI clamp-lock variants the SI lacked. Note this specific SKU lacks a magnet and cannot accept position sensors.
Airtac SI63 Standard Cylinder SI63X50FB Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X50FB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X50FB |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAI63X50FB 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 SAI63X50FB 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 SI63X50FB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SI63X50FB Is Used
Clamp Actuation
Provides 1559N of clamping force at 0.5MPa for securing heavy steel workpieces during machining operations.
Package Diverting
Executes short 50mm diverting strokes to push heavy cartons between adjacent conveyor lines.
Pallet Stopping
Acts as a robust pneumatic stop gate for pallets up to 79kg, utilizing its FB flange mount for rigid fixture attachment.
Replacing the Airtac SI63 Standard Cylinder SI63X50FB with the SAI63X50FB
To replace the SI63X50FB, order the SAI63X50FB. Confirm the FB flange mounting matches your ISO 15552 fixture, along with the 63mm bore, 50mm stroke, G3/8 port, and M16x1.5 thread. Because this SKU has no -S magnet, it cannot support switches; if sensing is required, select an SAI63X50FBS. For sizing, the 63mm bore yields 1559N push at 0.5MPa; dropping to a 50mm bore gives 982N, while an 80mm bore provides 2513N. A plain cylinder drifts on air loss since cushions only decelerate, so use an external pilot check valve or the SAIL lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X50FB
- ✓ 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 SI63X50FB FAQ
Yes, the SI63X50FB is discontinued. The direct replacement is the SAI63X50FB. It shares the same ISO 15552 mounting interface, 63mm bore, 50mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 port. At 0.5MPa it provides 1559N push and 1402N pull force. At 0.7MPa push is 2182N, and at 0.9MPa it is 2805N. The theoretical maximum force is 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X50FB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X50FB replacement — usually within 7-8 hours.