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For a unified triangular external thread the distance between the crest and root (d) is ____ when pitch (p) is given.

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For a unified triangular external thread the distance between the crest and root (d) is ____ when pitch (p) is given.

(a) d= 0.75 p

(b) d= 0.5 p

(c) d= 0.61 p

(d) d= 0.64 p

I had been asked this question in exam.

The doubt is from Screw Threads in chapter Screw Threads & Screwed Fastening of Engineering Drawing

1 Answer

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Right answer is (c) d= 0.61 p

Explanation: For a buttress thread the distance between the crest and root (d) is 0.75 times the pitch, for square thread ‘d’ is 0.5 times the pitch, for a Whitworth external thread ‘d’ is 0.64 times the pitch, for a unified triangular external thread the ‘d’ is 0.61 times the pitch.

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