(i) Full floating
(ii) Semi floating
(iii) Stationary (i) Full floating This pin which is free to turn inside the small end of connecting rod too as in the piston bosses. It is held in piston with means of circlips which keep pin inside the bosses. (ii) Semi floating This pin is that kind of pin which is fixing in the small end of connecting rod, and is held fixed through means of a cotter bolt. It is free to turn in piston bosses. (iii) Stationary The Stationary type of gudgeon pin is bolt to tile piston and cannot turn. The connecting rod move around it.