– Certification and standards: API Spec 7-1, API Spec 7-2, Q1 and ISO 9001, ISO
29001 and NS-1
– Slick and spiral Drill Collars, with slip and elevator recesses according to
customer’s request
– Steel grade: AISI 4145H mod, fully heat treated as per API Specification
– At customer request it is possible to produce Drill Collars from non-magnetic
and H2S resistant steel grades
Technical parameters
– OD: from 79,4 mm (3 1/8”) up to 279,4 mm (11”)
– Length: 8300 mm, 9145 mm and 9450 mm, at customer request the length can
vary from 6500 mm up to 12500 mm
– Standard API and double shouldered thread connections are made with stress
relieved elements, cold rolled and phosphated, and equipped with pressed
steel or heavy duty plastic thread protectors оn both ends
– Hard banding of ARNCO150/350XT, Castolin OTW 13CF and HOTW 10SS,
tungsten carbide
– Ultimate tensile strength: min – 140 000/965 ksi/mPa, Yield strength: min
110,000/758 ksi/mPa, Elongation: 15%, Impact strength: min 48J, Brinell
hardness: min 285-341 HB
– Mechanical properties guaranteed to 1”
below steel surface.
