Discussion
What is the name of process of producing a flat seat for a bolt head at the opening of drilled hole
Answer: D
The process is Spot facing.
Spot facing machines a small, flat, circular seat square to the hole axis around the mouth of a drilled hole, usually on a rough casting or forging, so that a bolt head, nut or washer bears evenly on it.
Counter boring enlarges the hole to a definite depth to sink the bolt head below the surface, which is deeper than a spot face. Counter sinking makes a conical recess for a countersunk screw head. Reaming finishes the hole to an accurate size and does not produce a seat.
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