drill collars 3 meters length with 2 3/8 Mayhew Junior connections and 65 mm spanner flats

A Drill Collar is a tubular piece of a drill string which provides weight on the bit for the purpose of drilling. While drill pipes make up the majority length of drill strings, drill collars make only a small amount. They have thick walls machined from the solid bars of steel. The steel bars are usually of plain steel but are sometimes of non-magnetic nickel-copper alloy or of other non-magnetic premium alloys.

Designed to place weight on the drill bit and pump drilling fluids, our drill collars are integral heavy-wall joints manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the required mechanical properties and then trepanned, drifted, and threaded. Our drill collars are furnished as slick or spiraled; spiraled drill collars have grooves machined in the outside surface that promote the even flow of drilling fluid around the drill collar diameter, equalizing pressure and reducing the occurrence of differential sticking.