These notes relate to the method of drawing bolt / rivet holes using a simplified system as described in the British Standard identified below;

BS EN ISO 5845-1 TD- Simplified representation of the assembly of parts with fasteners part 1: General Principles

The first figure shows the acceptable simplified representations of holes drilled for the purpose of bolts or rivets in the view look directly at the holes ..

The second figure shows the acceptable simplified representations of holes drilled for bolts or rivets-- Side view

The third figure shows the acceptable simplified representations of holes with bolts or rivets-- Side view

The fourth view simply shows how to conveniently indicate the bolt or rivet designation..