Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

0.175 - (0.841/T)
0.124 - (0.684/T)
0.154 - (0.912/T)
None of these

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Machine Design
A bolt

Has both the ends threaded
Has head at one end and other end fits into a tapped hole in the other part to be joined
Is provided with pointed threads
Has a head on one end and a nut fitted to the other

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