countersunk head

Such rivets come with rounded (universal) or 100 countersunk heads.

Some tradesmen did try to mask the screws by covering the countersunk heads with a small disc of velvet.

They are available in flat head, countersunk head, and modified flush head with standard diameters of 1/8, 5/32 and 3/16 inch.

Part 1 does not specify properties for fasteners that have head geometries that reduce the shear strength of the fastener, such as low head screws and countersunk heads.