Check the hole with perfect
Check the inside threaded dia
Check tapered hole with perfect fit
Check the taper accuracy of outside dia
For lubrication
Permit clearance
For expansion
Permit feeding of lapping compound
Diamond
Boron carbide
Silicon carbide
Aluminium oxide
Filing operation
Grinding operation
Chiseling operation
Precision finishing operation
Pitch x no of starts
Lead x no of starts
Pitch x major diameter
Pitch x minor diameter