verb (past and past participle countersunk /-ˌsəNGk/)[with object]
1Enlarge and bevel the rim of (a drilled hole) so that a screw, nail, or bolt can be inserted flush with the surface.
- Drill and countersink screw holes for mounting screws.
- Drill four 3/16-inch clearance holes in each rib before countersinking the top surface to bring the screw head flush.
- I've also countersunk the holes so no screwheads stick up later on.
1.1Drive (a screw, nail, or bolt) into a countersunk hole.
- It's helpful to first pre-drill a small hole in the wood where you want to countersink the brass screws.
- Flat heads are always countersunk or rest flush with the surface.
- A thin layer of thinset adhesive is applied to the top of the plywood using a notched trowel, then the cement board is put in place and secured with flathead screws that are countersunk into the surface.
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