ROTARY KELLYS


MATERIAL (AISI 4145H)-MECHANICAL PROPERTIES

Kellys are made from AISI 4145H modified alloy bars which 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. Kelly ends and center drive sections are milled and gauged to industry standards. Kelly’s are precision-trepanned to provide true bores. Kellys are drifted to API specifications with all connections precision-machined and quality-assurance inspected.

HEXAGONAL KELLYS

SQUARE KELLYS
NOTE:    All dimensions are given in inches unless otherwise stated.
            Short boreback standard in top box.