API 7-1 Square & hexagonal Rotary Kelly

We are one of the top 3 China’s leading drilling tool exporters servicing regular customers from Russia, Vietnam, UK, USA, Brazil...etc. Each kellyshall be conduct 4145H full length heat treatment to ensure that hardness can reach 285-341HB at 1inch from OD; impact energy more than 54J. Each product shall conduct sleeve gauge test strictly in accordance with API specification. Category: Drill Pipes, Drill Collars, Heavy Weight Drill Pipes, Non-magnetic Drill Collars, Kellys ,