Drill collars

API monogram ,serial number , OD ,ID ,type and size of connections are stamped on
recessed mill flats.
Drill collars are available in lengths from 10 to 31 feet and outside diameter from

3 1/8" to 11"

Each drill collar is fully inspected by internal inspection dept.All data obtained are
recorded on the inspection certificate furnished with eath drill collar.

Drill collars Type c (non-magnetic)are made from low carbon austenitic alloy
abtained by combining a proprietary chemical anylysis and a rotary hammer forging
process with low magnetic permeability excellent machine ability.

Drill collars(Type A,B andC)are manufactured according to API and SY/T standards .
Drill Collars