How is a spot face hole with 24mm diameter, 5mm deep and spot face diameter 10mm dimensioned?

A)
Φ24 and φ10
B)
φ24 SPOT FACE, φ10
C)
φ10 SPOT FACE, φ24 x 5 DEEP
D)
5 SPOT FACE, φ24 X φ10

Correct Answer : Option (C) :   φ10 SPOT FACE, φ24 x 5 DEEP

Explanation : Holes made by spot facing are dimensioned in this manner ‘φ10 SPOT FACE, φ24 x 5 DEEP’. This means the there is a spot face of 10mm diameter after the 24mm diameter and 5 mm thickness. Using this makes the reading of the dimension easy.

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