Spanners are used for operating threaded fasteners, bolts, and nuts.
They are made with jaws or opening that fit square on hexagonal nuts and bolts and screw heads.
They are made of high-tensile or alloy steel.
They are drop-forged and heat-treated for strength.
Finally, they are given a smooth surface finish for ease of gripping.
Spanners are considerably in shape to provide ease of operation under different conditions.
The basic types of spanners are:
Open-end spanners
tube or tubular box spanners
Socket spanners
Ring spanners
Socket spanners:
The socket is one of the fastest and most convenient of all the spanners.
Sockets come in two sizes; standard and deep.
Standard sockets will handle most of the work, while the extra reach of the deep socket is occasionally needed.
Socket wrenches are widely used hand tools for easy tightening and loosening of common fasteners, typically nuts and bolts.
They work in much the same way as standard spanners and wrenches, but their ratcheting design allows the user to apply torque more easily, with less strain and fatigue.
Ring spanners:
These types of spanners are used where obstruction close to the side of a nut prevails and application of open-ended spanners is not possible.
These are available in a set of 8 Nos. (8 to 27 mm): 8 × 9, 10 × 11, 12 × 13, 14 × 15, 16 × 17, 18 × 19, 20 × 22, and 24 × 27 mm.
