Specification of Drill Collars :

Laxmi Udyog manufactures short length Drill Collars in all outer dia. Size strictly as per A.P.I. specification, these are made from alloy steel AISI 4145 H and Heat treated to meet the specified properties.

The precision threads on all drill collar connection meet or enceed API specification. Threads are kemplated to prevent galling during make-up, than thread protectors are installed. API relief groves an pin or bore back are available upon request.

Both connection are cold working increase the endurance limit of a connection because surface metallic fibers in the thread root are cold rolled.