A short length of drill collar that has male threads on one end and female on the other. It is screwed onto the bottom of the kelly or topdrive and onto the rest of the drillstring.

Mar 24, 2025 · Kelly Saver Sub Subs are short pieces of tubular material used to increase the versatility of the main component of the drilling string. The simplest is a crossover sub, which connects two items with different threads.

Saver subs, sometimes referred to as crossover subs or drill saver subs, are an indispensable part of any horizontal directional drilling (HDD) operation. As a vital intermediary between the drill pipe and the drill head, these subs bear the brunt of the stress, wear, and tear experienced during drilling operations.

Sub-drill Saver Subs are available to suit all Top Drive and Kelly applications and can be manufactured slick or with spline detail to suit the specific Top Drive or Kelly requirements.

Saver Subs. Saver subs are used to extend the life of the drill stem component it is made up to by taking the wear caused by multiple connections. The saver sub connection is sacrificed because it can easily be repaired or inexpensively replaced.

What is a Saver Sub? A Saver Sub is a robust, threaded coupling designed to connect the topmost joint of the drill string to the Kelly. It acts as a buffer, absorbing the wear and tear that would otherwise damage the Kelly's threads during the rig's operations.

What is a Saver Sub? A saver sub, essentially an expendable substitute device, is incorporated into the drill stem. It is designed to absorb much of the wear and tear that occurs at the critical interface between frequently broken joints.

Saver sub are manufactured to the following specs connections, lengths, weights and material grade. A saver sub falls under the drill string accessory tool category and a short pipe that is replaceable and expendable without a major investment.

Kelly Saver Sub. A short substitute that is made up onto the bottom of the kelly to protect the pin end of the kelly from wear during make-up and break-out operations. Source: API RP 7G, Recommended Practice for Drill Stem Design and Operating Limits, Upstream Segment, Sixteenth Edition, August 1998 (Addendum 2: September 2009). Global Standards

The TOP Drive Saver Sub serves as a sacrificial element between the drill string and the top drive, reducing any unwanted repair and maintenance costs. All Top Drive & Kelly Saver Subs are manufactured in conformance with OEM specifications and latest industry standards.