This is a conical-shaped recess around a hole, often used to receive a tapered screw head:

Boss

Spot-face

Countersink

Counter-bore

Correct Answer : Option (C) : Countersink

Recently Updated in Engineering Drawing Questions

The Press-Pull tool will ________ the face of a solid model in the direction it faces.

Spiral

Extrude

Taper

None of the above

Correct Answer : Extrude

Architectural drafters generally prefer to use ________ drawings to help illustrate 3-dimensional views of a structure.

Perspective

Auxiliary

Isometric

Orthographic

Correct Answer : Perspective

This is used to indicate that a surface is to be machined:

Machining mark

Finish mark

Coordinate mark

Roughness indicator

Correct Answer : Finish mark