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Description:Drill Collar Deep hole boring & heat treating: Drill Collars are trepanned and drifted to API Spec 7 latest edition. Our steel is quenched and tempered, using latest barrel-type heat treatment furnace. Full-length heat treatment processes ensure that mechanical properties meet or exceed API Spec 7 requirements. A hardness range of 285-341, Brinell Hardness and Charpy V notch minimum impact strength of 40ft-lb at 70°F are guaranteed one inch below the surface. Tractability: Drill collar material and process traceability are maintained from receipt of mill certified raw materials to completion of all the manufacturing. Serial numbers are die stamped on bar bodies. Cold-Rolled Thread roots: Drill Collar thread roots, as well as elevator recess upper radii are cold rolled. The cold rolling creates a compressive recess upper radii stress condition that increases fatigue life by minimizing crack initiation Slips and Elevators for Drill Collar: Elevators and slips to our drill collars are available upon request These recesses allow one to dispense with lift subs and safety clamps and to attain savings in operating time. Slip and elevator recesses are machined in compliance with API RP7G guidelines Standard Size: 4-1/8, 4-3/4,6-1/4,6-1/2,7,8,9,9-1/2,11