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All threads are cold rolled and made of AISI 4145H alloy steel and formed by hot forged and fully heat- treated, intermediate frequency induction heat treatment or 20m horizontal optical resistance furnace, which can provide high physical properties in full length. copper plating or phosphated.
All ends and center drive sections trepanned to provide true bores.
In accordance with API spec 7 and stamped with the API monogram
Mechanical property is same to drill collar's performance and specification is linked to Specification of Square Kelly.