The tightening tools include pliers, screw driver and wrenches, which are discussed as under.
Pliers are namely ordinary needle nose and special type. Fig shows a long nose pliers and Fig. shows a combination pliers. These are commonly used by fitter and
electrician for holding a variety of jobs.
2. Screw driver
Screw driver is a screw tightening tool. The most commonly used standard screw driver with its parts is shown in Fig. It is generally used by hand for tightening the screws.
It is also of various types depending upon the kind of work.
Wrenches are commonly known as spanners. These generally come in sets and are commonly identified by numbers. These are of various types and few general types involve open single ended, open double ended, closed ended adjustable, ring spanner, offset socket, t-socket, box wrench, pipe wrench and Allen wrench. Source A Textbook of Basic Manufacturing Processes and Workshop Technology by Rajender Singh.