OSS drill stem substitutes are manufactured from Alloy Steel AISI 4145 H Modified, in accordance to the requirements of A.P.I. Spec 7-1.

The subs can be manufactured in various O.D. sizes, complete with A.P.I. connections or premium connections and stress relief features (if required), to meet the needs of our customers.

Cold rolling of thread roots and phosphating of connections are provided to minimize galling.

Material certificates, Certificates of Conformity and 3rd party inspection reports will be furnished to our customers for traceability.