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Thread pipe ASTM A53 / BS 1387 with NPT thread / BSP thread pipe coupling and galvanizing coating 30~100 micro thick To meet our clients and market demand ,we developed pipe hot dip galvanizing and pipe treading,as one of our extended products basis on Huike seamless pipe factory,our excellent NTP&BSP thread pipes have gained very good reputation from all over the world, especially for the galvanizing coating, we can do 100micro thickness by blowing way , size from 1/4'' up to 8'',this highly cater to some government projects which required high quality and long useful life .Quick details of