Drill Stem Accessories

Pup Joints

Pup joints are manufactured from the same material as our drill collars. Heat-treatment processes ensure a hardness range of 285-341 Brinell. Charpy "v" notch minimum impact strength of 40 ft-lb at 70° F are guaranteed one inch below the surface.

Integral drill pipe pups are heat treated to 120,000 psi minimum yield. Integral pups have the same tensile and torsional rating of S-135 drill pipe with the same pin ID. All connections are phosphate-coated to improve resistance to galling.

Standard lengths are 5 ft, 10 ft, 15 ft, and 20 ft. Additional sizes are available upon request.

Same-size pup joints 10 ft and longer can be produced as welded assemblies.

Rotary Kellys
NOV Grant Prideco offers square and hexagonal kellys. Kellys are available up to 46 feet long. Our kellys are made from 4145-modified alloy bars that are quenched and tempered full length. A hardness range of 285 to 341 BHN and a minimum impact value of 40 ft-lbs are maintained one inch below the surface at room temperature. All ends and center drive sections are machined. NOV Grant Prideco kellys are precision-trepanned to provide true bores. They are drifted to API specifications, and all connections are machined. NOV Grant Prideco kellys are stamped with the API monogram, where applicable.

Rotary Subs
Rotary subs are available in standard lengths of 36" or 48'. Rotary subs are manufactured from drill collar material trepanned and drifted to API Spec. 7 -1 requirements.