? Kelly is on the top of drill stem,
transmitting torque and supporting drill stem?s suspension weight.
It?s the drive section of the whole drill stem. We can manufacture
square Kelly and hexagonal Kelly accordingly, which are forged to
and refined by AISI***5H alloy steel, quenched and tempered along
full length, with its hardness range of ******1BHN, charpy impact
value?*4J. The bore eccentricity can reach
the minimum thickness of the standard, it?s ensured. Kelly ends and
drive section, connections are processed and inspected according to
API SPEC **1 and SY/T********0. Kelly bars are inspected by an
ultrasonic unit over their full length. ? By military industry power, our
company had designed, developed and manufactured all specifications
of kellys in *0th, last century, which made nationalization lasting
to this day. Our square kellys and hexagonal kellys (all
specification) have won high reputation from our customers, for
their high quality and excellent performance.
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