Drill Collars Grant Prideco Drill Collars are integral heavy-wall joints that are manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the required mechanical properties, then trepanned, drifted and threaded. Drill collars are furnished as slick or spiraled in 30 or 31 foot

- Grant Prideco 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 minimum impact strength of 40 ft-lb at 70° F are guaranteed one inch below the surface.
- Grant Prideco integral drill pipe pups are heat treated to 120, 000