Plain bushing

Cylindrical bushing with a through hole.

Shouldered bushing

Bushing with a shoulder that seats against the plate and takes axial load.

Round-flange bushing

Bushing with a flange and mounting holes: it bolts to the plate instead of being pressed in.

Center-flange bushing

Bushing with the flange mid-length: the body sticks out on both sides of the plate.

Square-flange bushing

Bushing with a square flange and four corner holes: it cannot rotate and squares up against an edge.

Compact-flange bushing

Bushing with a flange trimmed to two flats and two holes: it fits where a round flange will not.