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4.8 grade zinc cross recessed countersunk screws
Dimensions: M5-M10
Standard Designation: GB/T 819-1985
Material Grade: Carbon Steel
Head Style: countersunk head
GB/T 819-1985
Countersunk screws, also known as flat machine screws, are similar to common wood screws. They have tool tightening grooves on their heads, which can be in the shape of a flat, cross, or hexagonal socket. A 90-degree conical round socket is machined on the surface of the mounting hole on the connector. The head of the flat machine screw is in this socket and is flush with the surface of the connector. Flat machine screws are also used in some occasions. Semi-circular head flat machine screws are more beautiful and are used in places where a little protrusion is allowed on the surface.
