Stable Services’ Drill Collars are manufactured from 4145H modified steel. Drill Collars are bored and drifted to API spec 7-1 and fully heat treated to meet or exceed the mechanical property requirements of API spec 7-1 and NS-1. A through-wall hardness range of 285–341 HB and a charpy “V” notch impact strength of 42 joules at 20ºC are guaranteed one inch below the surface.

API Connection
All API connections comply with dimensional requirements specified in API spec 7 and API RP 7G. Common sizes and styles are summarised in Table 1 below. Premium connections are available on request.

Options Available
• Spiral and slick
• Slip and elevator groove
• Hard-banding
• Alloy steel
• Non-magnetic steel
• Sale or rental