PARVEEN manufactures all Four types of Subs e.g. straight O.D. Type 'A' or Reduced Section Type 'B' or Swivel Sub type 'C' or Lift Sub Type 'D'. These would be with Box and Pin connections or with Box or Pin connection on both sides. Class of Subs manufactured are: a) Kelly Subs b) Tool Joint Subs c) Crossover Subs d) Drill Collars Subs e) Bit Subs f) Swivel Subs g) Lift Subs. Bit subs can be bored out for installation of Float Valve assembly. Subs manufac-tured by Parveen shall be marked with Parveen API-License Number, the inside dia size and style of connection at each end. These marking will be done in a recess, located on O.D. of sub, approx. 3" long, 3/4" wide and 3/16" deep. Rotary shoulder connections can be provided for NC23-31 to NC 70-100, 2 3/8" Reg. to 8 5/8" Reg. and 5 1/2"FH & 6 5/8"FH. Any other connections eg. Extra Hole(X.H.), Slim Hole(S.H.), H-90, Hydril etc. can also be provided upon request.

The Mechanical Properties of all new steel Drill Stem Subs shall conform to the same standards as Drill Collars.