Kelly is the drive part of whole
drill stem, it has two types, square kelly and hexagonal kelly
and all of them are
manufactured comfort to API
Spec7-1 and SY/T6509-2000
criterion. Our Square& Hexagonal kelly
are made from AISI 4145H
modified alloy bars that are
quenched and tempered full
length. After such heat
treatment, its brinell hardness
can reach 285-341. Kelly's end, drive cross-section and joint are
all processed and tested
conform to API criterion. We are responsible for
customers, strictly implement
the standard specifications, and
provide high-quality products
and service. Sincerely hope to
establish good trade
relationship with all friends at
home and abroad.
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