Foremost floating cushion subs (FCS) are utilized in both slanted 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 Floating Cushion Sub performs two important functions:

  1. It provides a means of making up and breaking out threaded connections without damaging threads.
  2. It prolongs bearing and gear life of the rotary top drive.

Foremost floating cushion subs are an economical accessory with the proven ability to help increase tooling life and reduce equipment downtime.

ModelApplicationHoist/PulldownTorqueStrokeWeight
306130Construction, Mining, Oilfield, Water Well200,000 lbs (90,718 kg)20,000 ft-lbs (2,765 kg.m)2.50" (63.5 mm)195 lbs (89 kg)
306430Construction, Mining200,000 lbs (90,718 kg)30,000 ft-lbs (4,147 kg.m)2.50" (63.5 mm)1,050 lbs (476 kg)
359150Oilfield300,000 lbs (136,078 kg)35,000 ft-lbs (4,839 kg.m)3" (76.2 mm)850 lbs (386 kg)
PD6-2Construction, Mining, Water Well125,000 lbs (56,700 kg)12,000 ft-lbs (1,659 kg.m)Light Duty - 0.75" (19 mm)
Heavy Duty - 1.75" (45 mm)		165 lbs (75 kg)
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