Drill rods are manufactured to two standards the 'W' Series (EW, AW, BW, NW, HW) and the old series (E, A, B, N). The 'W' Series rods have a larger outside diameter, an increased inside diameter and are more rigid than the 'Old' Series.

Amko drill rods are manufactured from cold drawn seamless steel tube. Couplings are machined from heat treated alloy steel to withstand wear and stress to which they are prone.

Standard 'W' and 'X' Series rods are flushed-coupled and a coupling is supplied with each rod length.Drill Rod Tube are Parallel Wall , Cold Drawing Cold Upset or Shrunk and Welded as required.