DHOT Drill Collars are manufactured from 4145H MOD Q steel with a hardness range of 285-341 BHN. All API connections comply with dimensional requirements specified in API Spec. 7 and guidelines presented in API RP7G. All connections are phosphate-coated to improve resistance to galling as well as "cold rolled" to provide longer fatigue life. API stress relief groove pin and bore back box are available upon request. DHOT Drill Collars are offered as slick or spiral and can include optional features; slip and/or elevator recesses (to improve handling time)
& hard banding.
When ordering, please specify:Drill collar ODDrill collar bore IDLength of drill collarSlick or SpiralSize and Type of Connections, example: NC 50 box up x NC 50 pin downCast or pressed steel thread protectorsSlip and/ or Elevator Recesses Hard banding
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