Oil Country Tubular Goods (OCTG) are pipes used in wells in oil and gas industries.
OCTG Drill Pipe is the connections and used to transfer power in the drilling tool, the drill pipes cover sizes form 2 3/8 to 6 5/8 inches O.D., wall thickness from 6.88 mm to 12.7 mm, material grade E-75, X-95, G-105, S-135, etc., common tread type IF, FH, REG, NC, etc., according to API SPEC 5D Standard.