Cross Over Subs

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Cross over subs act as an intermediary between two dissimilar threads and are used to connect the two. A cross over sub can also be used to protect other tooling in your drill string and since the cross over sub (also known as saver sub) is the least expensive item in the drill string it can be designed to wear before any other drilling component does. A cross over sub can be used just above the bit or in a reverse circulation application to deliver outgoing air to the bit face. In these applications a cross over sub is usually called a bit sub. Often times cross over subs will be phosphated to thread together easier. In addition, all of the WDT cross over subs can have wrench flats milled into them to allow for better assembly and disassembly.

Cross over subs come in three basic styles:

  1. Pin (male) x Box (female)
  2. Pin (male) x Pin (male)
  3. Box (female) x Box (female)

The length of crossover subs is generally measured from shoulder to shoulder.

Typical lengths range from 6” – 28” long going up in increments of 2 inches.

Western Drilling Tools can cut nearly any non-patented thread. Some of the threads commonly cut include, but are not limited to:

  • API IF 2" - 5 1/2"
  • API REG 2 3/8" - 8 5/8"
  • API FULL HOLE 2 7/8" - 6 5/8"
  • API XTRA HOLE 2 7/8" - 3 1/2"
  • MAYHEW JR 2 3/8"
  • MAYHEW REG 2 3/8"
  • MAYHEW FH 2 7/8"
  • HUGHES H90 2 3/8" - 8 5/8"
  • HUGES External Flush 2 3/8" - 4 1/2"
  • BECO 3" - 10"
  • M.T. 3/4" - 2 1/16"
  • PAC 2 3/8" - 3 1/2"

For more information and product availability, Contact Western Drilling Tools at 1.888.410.0826.

Cross Over Subs | Western Drilling Tools Inc.