Foremost products

Foremost floating cushion subs (FCS) are utilized in both slant and vertical drilling operations to reduce vibration and wear of the drill string and drill rig components. Foremost manufactures several FCS models for mining, construction, water well and oilfield applications. The sliding spindle of the cushion sub permits the threads of the mating drill string components to float together or apart during rotation without any axial movement of the rotary drive. This decreases the impact on the rotary drive when the two mating threads are joined and decreases the load on the threads of the mating components.

The Foremost Floating Cushion Sub is designed to be installed on Rotary Drilling Rigs below the gear box and into the drive spindle by means of a threaded connection. The Cushion Sub will reduce vertical shock transmitted by the bit while drilling using either DTH Hammer or Rotary Drilling methods. The two and one half inches (2 1/2”) of free – floating travel of the Piston allows the drill operator to make-up and break-out threaded connections with minimal flank loading on the threads of the drill pipe or casing. This float within the housing enables the drill operators to make-up casing threads with little or no thread damage when stabbing the connections together or taking them apart. The sub can be used in vertical and or slant drilling applications.