Cushion Subs

Cushion subs, also known as float subs or floating cushion subs, are used as a connector between the rotary top drive and the drill string. Cushion subs serve three main functions: provide a means of making up and breaking out threaded connections without damaging threads, decrease the load on the threads of the drill rig components, and absorb shock and reduce vibration and wear of the drill string and drill rig components.

Cushion subs work using a sliding spindle, which permits the threads of the mating drill string components to float together or apart during rotation without any axial movement of the rotary drive. Upper and lower urethane cushions decrease the impact on the rotary drive bearings and gear box assembly, thereby prolonging bearing and gear life of the rotary top drive.

Other benefits of cushion subs include increased tooling life, reduced equipment downtime, and minimum maintenance requirements. Replacement seal kits are available, and cushion subs may be returned for rebuild or upgrade.

Givens International Drilling Supplies offers three generic cushion sub models: standard duty, deep hole, and heavy duty. We also offer Foremost cushion subs. Contact us today for more information about cushion subs.

View Specs

 

Standard Duty

  • 6” OD
  • Customizable length and thread connection specifications
  • 2” Stroke
  • 70,000 lbs. Hoisting/pulldown capacity

Deep Hole

  • 7” OD
  • Customizable length and thread connection specifications
  • 3” Stroke
  • 100,000 lbs. Hoisting/pulldown capacity

Heavy Duty

  • 8” OD
  • Customizable length and thread connection specifications
  • 3” Stroke
  • 100,000 lbs. Hoisting/pulldown capacity

Foremost Model PD6-2

  • 9 1⁄4” OD
  • 10” Shoulder-to-shoulder length
  • Customizable thread connection specifications
  • 3⁄4” – 1 3⁄4” Stroke
  • 125,000 lbs. Hoisting/pulldown capacity
  • Weight 165 lbs.
  • Spec Sheet

Foremost Model 306130

  • 10” OD
  • 14 1⁄2” Shoulder-to-shoulder length
  • Customizable thread connection specifications
  • 2 1⁄2” Stroke
  • 200,000 lbs. Hoisting/pulldown capacity
  • Weight 195 lbs.
  • Spec Sheet

Foremost Model 359150

  • 15” OD
  • 17” Shoulder-to-shoulder length
  • Customizable thread connection specifications
  • 3” Stroke
  • 300,000 lbs. Hoisting/pulldown capacity
  • Weight 850 lbs.
  • Spec Sheet

Foremost Model 306430

  • 18” OD
  • 16 3⁄8” Shoulder-to-shoulder length
  • Customizable thread connection specifications
  • 2 1⁄2” Stroke
  • 200,000 lbs. Hoisting/pulldown capacity
  • Weight 1050 lbs.
  • Spec Sheet