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

Boss
Spotface
Counterbore
Countersink

Correct Answer: Countersink

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More Questions from 2D Drawing Representation

This is an angled surface used on cylinders to make them easier to handle:
This is a flat or rounded tab protruding from a surface, usually to provide a method for attachment:
This is a hollow cylinder that is often used as a protective sleeve or guide or as a bearing:
A keyway is a small groove cut around the diameter of a cylinder, often where it changes diameter.
Small curves called runouts are used to represent fillets that connect with plane surfaces tangent to cylinders.
It is not always possible to show all of the drawing views in alignment on a sheet.
Right-hand and left-hand parts are mirror images and are made to be interchangeable.
A counterbore is a cylindrical recess around a hole, usually to receive a bolt head or nut.
When a curved surface intersects a plane surface, an edge is formed.
Simplified conventional representations that deviate from true orthographic projection may be used to enhance economy and clarity in a drawing.

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