Machine Design
The strap end of a connecting rod of steam engine is joined by

Knuckle joint
Spigot socket cotter joint
Sleeve and cotter joint
Gib of cotter joint

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Machine Design
A tap bolt

Has a head on one end and a nut fitted to the other
Has pointed threads
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

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