Steel grade:

AISI 4145 H modified alloy steel, full length heat treated, with chemical analysis and mechanical properties which conform to the requirements of API Spec 7 (latest edition)

Types:

• finished drill collars
• slick or spiral
• with or without slip + elevator recess
• bored drill collar bars, plain end

Sizes:

• 2 7/8" OD x 1 1/4" ID up to 11" OD x 3" ID