This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X50SFB, 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 SI63X50SFB
The AirTAC Airtac SI63 Standard Cylinder SI63X50SFB 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 SAI63X50SFB, 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 → SAI63X50SFB
- 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 SI63X50SFB
The AirTAC SI63X50SFB is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 50 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X50SFB, a direct replacement matching the exact ISO 15552 mounting interface, bore, stroke, force, and FB flange hardware.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also expands functionality with SAIL, SAIF, and BSAI lock variants the SI line lacked. Your -S magnet version supports legacy CS1-B/DS1-B sensors, while the SAI accepts current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X50SFB Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X50SFB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X50SFB |
| 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 SAI63X50SFB 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 SAI63X50SFB 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 SI63X50SFB
| 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 SI63X50SFB Is Used
Clamp Actuation
Provides 1559 N of clamping force at 0.5 MPa for securing heavy workpieces during CNC machining operations.
Short-Stroke Diverter
Ideal for 50 mm diverting gates on packaging lines, offering rapid 30-800 mm/s cycling with FB flange mounting.
Replacing the Airtac SI63 Standard Cylinder SI63X50SFB with the SAI63X50SFB
To replace the discontinued SI63X50SFB, order the SAI63X50SFB. Verify your ISO 15552 FB flange mounting, 50 mm stroke, G3/8 port, and the -S magnet for position sensing. If you need more force, the neighbouring 80 mm bore offers 2513 N push at 0.5 MPa; if less is required, the 50 mm bore provides 982 N. Note that a standard cylinder drifts on air loss because the air cushion only decelerates at stroke end. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variant. At 50 mm stroke, side-load risks are minimal, but always ensure rigid alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X50SFB
- ✓ 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 SI63X50SFB FAQ
Yes, the SI63X50SFB is discontinued. The direct replacement is the SAI63X50SFB. It shares the identical ISO 15552 mounting interface, 63 mm bore, 50 mm stroke, G3/8 port, and FB flange, fitting directly into existing fixtures.
The G3/8 port feeds a 20 mm rod delivering 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa push is 2182 N, and 2805 N at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X50SFB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X50SFB replacement — usually within 7-8 hours.