Crossover Subs

Circulating Subs
Crossover Subs
Drillable Lifting Subs
Drill Pipe Pup Joints
Kelly Saver Subs
Lift Nubin
Lifting Subs
Lower Kelly Valves
Side Entry Subs (Integral)
Side Entry Subs (Welded)
Upper Kelly Valves
image of crossover subs from Downhole Oil Tools
A crossover sub is used to crossover from one connection size to another or as the disposable
component used to extend the connection life of a more expensive drill stem member.

Crossover subs are available with:

  •   box x pin
  •   box x box or
  •   pin x pin connections.

Crossover Subs are manufactured from 4145M or 4140HT alloy steel. The connections are protected
by a phosphate surface coating that minimizes galling on initial make-up.

When ordering, please specify:

  • Identify sub use. Example: Kelly Sub, crossover drill pipe to drill collar, drill collar to drill collar, bit sub, etc
  • Overall length
  • Largest diameter
  • Bore ID
  • Size and type of upper and lower connections, indicating pin or box
  • Cast or pressed-steel thread protectors
  • For Reduced Section Subs, add: diameter of reduced section
  • Length of reduced section: 8", 12", 18" or 24"
  • For Bit Subs, add: float bore size and type if desired