Single Start thread
Multi Start thread
Right hand thread
Left hand thread
Casting
Machining
Welding
Annealing
Increase ductility
Increase malleability
Increase strength
Increase britlenesss
More initial cost
Freedom from arc blow
More maintenance cost
Un suitable for non ferrous metal
Suitable for all ferrous and non-ferrous
Initial cost is higher
Maintenance cost is more
Special safety precaution required