Kellys are made from 4145H modified alloy steel in accordance with API Spec 7-1 latest edition, which are quenched and tempered along full length. Kelly’s mission is to transfer energy from the rotary table to the drill string.
Norminal size: 2 1/2" - 6";
Kelly type: square or hexagonal;
LH Connection: 4 1/2 REG, 6 5/8 REG, etc;
RH Connection: NC26, NC31, NC38, NC46, NC50, etc;
Manufactured from AISI 4145H-modified, fully heat-treated alloy steel with a Brinell hardness range of 285-341BHN and a minimum average Charpy impact value of 40 ft-lbs;
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