Foremost - Model FCS - 306130 - Floating Cushion Subs (FCS) - Brochure

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.