Question

Chamfer is conical round off to the prism of bolt head at:

• A. an angle of $15^{\circ}$ on the outer end face.
• B. an angle of $30^{\circ}$ on the inner end face.
• C. an angle of $15^{\circ}$ on both end face.
• D. an angle of $30^{\circ}$ on the outer end face.

Hint:

The $30^{\circ}$ chamfer on the outer end face of a hexagonal nut or bolt head produces the characteristic hyperbolic arcs visible on the front and side views of the head.

Answer 1

The Correct Option is D