Page 28 - Electrician - TT (Volume 1)

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Fig 15 Fig 16

17 Spanner: double ended (Fig 17) BIS 2028
The size of a spanner is indicated so as to fit on the nuts. They are available in many sizes and shapes.
The sizes, indicated in double-ended spanners are
10-11 mm
12-13 mm

14-15 mm
16-17 mm
18-19 mm
20-22 mm.

For loosening and tightening of nuts and bolts, spanner sets are used. It is made out of cast steel. They are
available in many sizes and may have single or double ends.
18 Hacksaw frame and blade
The hand hacksaw is used along with a blade to cut metals of different sections. It is also used to cut slots and
contours.
Types of hacksaw frames
Bold frame: Only a particular standard length of blade can be fitted.

Adjustable frame (flat): Different standard lengths of blades can be fitted.
Adjustable frame tubular type (Fig 18): This is the most commonly used type. It gives a better grip and control
while sawing.
Hacksaw blades : The hacksaw blade is a thin, narrow, steel band with teeth and two pin holes at the ends. It is
used along with a hacksaw frame. These blades are made of either low alloy steel (la) or high speed steel (hs)
and are available in standard lengths of 250mm and 300mm.

For proper working, it is necessary to have frames of rigid construction.
Types of hacksaw blades
All-hard blades: The width between the pin holes is hardened all allong the length of the blade.

Fig 18
Fig 17

14 15

CITS : Power - Electrician & Wireman - Lesson 1- 4