B.S. convention for springs

Hi
I am a graphics teacher with S5 pupils doing Higher Graphic Communication projects. Can anyone direct me to current British Standards for
representing springs - as in the ends of torches, staplers etc.
Thanks
Davy M
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.