Amphenol Sine offers a number of products from other divisions of Amphenol through DigiKey, including Amphenol Audio’s AC-USB3-AAB USB-A panel receptacle. Questions arise concerning the mounting screw dimensions; as Amphenol does not supply mounting screws, which size of screw do they recommend?
The answer is that while the manufacturer makes no recommendation on screw size directly, they specify the mounting holes as being 3.5mm in diameter. As such, M3 or M3.5 screws will both fit, though M3.5 would be the thing to try first. We have a variety of options in these screw sizes, flatheaded to fit the connector’s countersunk mounting holes, here: M3 and M3.5 Screws from DigiKey