Counter Sunk Bolts are bolts designed to fit inside a countersunk hole.

• Countersunk bolts are mostly hidden when screwed in, because their heads are shaped to fit within the special holes.
• When these holes are empty, they look like a normal screw hole with a conical opening at the top, when they are full, the only visible part should be the very top of the screw or bolt.
• This conical opening allows countersunk bolts to screw into the hole and down into the opening, so the bolt head is flush with the surface of the object.
• Countersunk bolts are used when a smooth surface is required. Common applications include: bridge decking, walkways, and railing.
• Different sizes, material, designs and types are available.