Full quality control procedures are maintained throughout all production processes; when HF3000 hard-facing is applied, final ultrasonic inspection is carried out to ensure that a minimum of 97% bonding of carbide inserts is obtained. This is the OSS guarantee and each tool is certified to this effect. Connections also receive

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