The purpose of using flux in soldering is to

Increase fluidity of solder metal

Fill up gaps left in a bad joint

Wash away surplus solder

Prevent oxides forming

Flat chisel

Round nose chisel

Cape chisel

Diamond pointed chisel

Enlarging the hole

Machining of the wall surface of hole

Flat machining the face surface around the hole

Cutting internal threads

Actual size of the job

Basic size of the job

Minimum size of the job

Maximum size of the job

TO prevent slackening of nuts due to vibration

To prevent damage to the work

To prevent damage to the bolt

To prevent damage to the thread