Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

45 to 60%
80 to 90%
70 to 83%
63 to 70%

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Machine Design
A tap bolt

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

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