Screw threads are produced without metal removing by a process called :

Thread cutting

Thread chasing

Thread rolling

Tapping

'V' threads

Square threads

Knuckle threads

Acme threads

Pitch diameter

Pitch

Helix angle

Profile

Width of crest

Minor diameter

Major diameter

Pitch diameter

Used to tap over sized holes

Used to tap holes with slots

The tap tends to push the chips ahead of the tap

Threads formed by displacing the work material