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By certification 
Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the "as rolled" surface finish condition. Alternative surface finishes are available.
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3-1/8 " OD Slick Drill collar Specification Product: Slick Drill Collar Nominal OD Size: 3-1/8 " (79.4mm) Nominal ID Size: 1-1/4" (31.8mm)Steel Grade: AISI 4145H Overall Length: 30~31ft (9140~9450mm) Connection Thread Type: NC23 |
http://www.petrodrillingequipment.com/
