OL

Symbol used to indicate ordinary lay rope construction.

ON RUBBER

The operation of a truck mounted or rough terrain mobile crane without the aid of outriggers.

OPEN WEDGE SOCKET

See wedge socket.

ORDINARY LAY

A method of FSWR construction where the strands are laid in the opposite direction to the outer layer of wires. Referred to in North American manuals as ‘regular lay’.

OUTBOARD

The portion of a needle or other cantilevered beam between its fulcrum and its outermost attachment point.

OUTRIGGER

A stabilising extension for a mobile crane.

OVERHAULING WEIGHT

Counterweight to overhaul the self-weight of an unloaded hoisting rope.

OVERWOUND

Rope winding on and off the top side of a winch drum.