For fastenings, the American Standard V-thread, with its crest and root flattened, is used in this country. ... The British Standard is the Whilworth thread, cut at 55Ad, with tops and bottoms rounded one-sixth of the depth of the triangle, as shown in anbsp;...
|Title||:||A manual of engineering drawing for students and draftsmen|
|Author||:||Thomas E. French|