Question 1
A 12 mm-thick cover carries the callout 'Ø6 THRU; counterbore Ø10, 4 DEEP.' Both diameters share one axis, and the counterbore depth is measured from the entry face. An axial section should therefore show:
Show answer & explanation
Correct answer: A - A flat-bottomed Ø10 cylindrical recess 4 mm deep, followed by a Ø6 through hole.