--- title: The Importance of a Crossover Sub | M&M International description: Learn how crossover subs are essential for drill pipes, collars and the three different types. 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Let's examine the significance of this sub and highlight some of its key features. 1\. [What is a Crossover Sub?](https://mm-intl.com/blog/the-importance-of-a-crossover-sub#what-is-a-crossover-sub) 2\. [What Are The Uses of Crossover Subs?](https://mm-intl.com/blog/the-importance-of-a-crossover-sub#what-are-the-uses-of-crossover-subd) 3\. [What is the Importance of a Crossover Sub?](https://mm-intl.com/blog/the-importance-of-a-crossover-sub#what-is-the-importance-of-a-crossover-sub) 4\. [Standard and Premium Crossover Subs?](https://mm-intl.com/blog/the-importance-of-a-crossover-sub#standard-and-premium-crossover-subs) [![Drill Stem Subs Brochure](https://no-cache.hubspot.com/cta/default/22100640/6466b340-8c06-4077-b8dd-168713c21c24.png)](https://cta-redirect.hubspot.com/cta/redirect/22100640/6466b340-8c06-4077-b8dd-168713c21c24) ## What is a crossover sub? The term "crossover sub" is used to describe a mechanical component with threaded connections. It's used to connect components with different sizes or thread types. [Crossover subs](https://www.superiorperformance.com/crossover-subs) are most often found in the drill pipe between the drill pipe and drill collars, as well as at other locations throughout the drill string. These components let the [driller](https://www.keystoneenergytools.com/becoming-an-offshore-driller/)modify installations according to their field conditions. ## What are the uses of crossover subs? Crossover subs typically provide the connection between drill pipes and collars, and are typically designed with a box and threads. When two threaded components are joined, one end of the crossover sub is built to match the thread pattern of one of the components to be joined, and the other end is built to match the thread pattern of the second component. Drilling rigs generally include a wide range of crossover subs and operators utilize them as needed to join disparate parts. The subs' threaded connections can be protected by a layer of phosphate-coated material that prevents galling during the initial make-up and deters corrosion. Subs are manufactured according to the specifications that are provided by the [American Petroleum Institute](https://info.keystoneenergytools.com/blog/tools-you-can-trust-why-api-standards-matter) [API](https://www.keystoneenergytools.com/api-spec-8c-drilling-and-production-hoisting-equipment/). ## What is the importance of a crossover sub? ### Crossover subs are an important part of any drilling operation Crossover subs are an important component of every drilling operation as they provide the flexibility to adapt the drill string to the specific requirements of the well-being drilled. They are also used to repair damaged sections of the drill string and to connect dissimilar parts of the drill string. Crossover subs play a vital role in ensuring the safe and successful completion of drilling operations. ### Crossover circulating subs are essential for fluid management in drilling operations According to the demands of clients or the specific job in question, a variety of companies offer or produce crossover circulating subs. These subs are equipped with a side port or an inline port to assist in the circulation of fluids. The majority of the connections are cut to meet [safety](https://www.keystoneenergytools.com/5-rig-safety-precautions-you-need-to-follow/)and ground requirements. They're made from heat-treated steel for greater strength and durability. ### Crossover subs are used for several purposes Crossover subs are used to transition from a single connection to another. These components are also utilized to extend the life of more expensive drill stem components. Crossover subs are available in three different forms. Connections on subs are available in three variations: - Box/Box - Box/Pin - Pin/Pin ## Standard and premium crossover subs Companies like[M&M International](https://mm-intl.com/) and [Superior Performance](https://www.superiorperformance.com/) have standard and premium connection crossover subs available. These short subassemblies used to connect components of different sizes and/or with different threads are essential when linking connections or to drill pipe. M&M international carries crossovers ranging in size from 2 3/8 inches to 20 inches in various connection options. Additional sizes and connections can be special ordered.  Request a quote today to get your custom crossover subs! [![New call-to-action](https://no-cache.hubspot.com/cta/default/22100640/f54e003d-752a-423e-a2f0-79a2b36e5b79.png)](https://cta-redirect.hubspot.com/cta/redirect/22100640/f54e003d-752a-423e-a2f0-79a2b36e5b79) Original Blog Post: [https://www.superiorperformance.com/company-news/the-importance-of-crossover-sub](https://www.superiorperformance.com/company-news/the-importance-of-crossover-sub) --- #### About M&M International ![\_(250 x 250 px) (3)](https://mm-intl.com/hs-fs/hubfs/_(250%20x%20250%20px)%20(3).png?width=123&height=123&name=_(250%20x%20250%20px)%20(3).png) M&M International is a family owned and operated original equipment manufacturer in the energy industry.  Since its founding in 1980, M&M has become internationally known in the industry for creating and manufacturing the most efficient, reliable, and user-friendly [well control valve](https://mm-intl.com/products/ball-valves) design in the world, namely, the [CANISTER GUARD®](https://mm-intl.com/products). M&M also manufactures a wide variety of [subs](https://mm-intl.com/products/subs), [inside blowout preventors](https://mm-intl.com/products/inside-bop-valves) (“IBOPs”), [swivels](https://mm-intl.com/products/swivels), surface test trees, offline cementing valves, and other equipment used during drilling, completion, and production operations, both on land and offshore. In addition to our products, we also offer a full spectrum of manufacturing [services](https://mm-intl.com/services) and stand ready to build not only our own designs, but the designs brought to us by our customers and partners. The [M&M Team](https://mm-intl.com/about/leadership-team) is committed to solving the most common, and uncommon, problems associated with the well control sector today. We also put forth great effort assisting our customers in solving problems associated with other aspects of the energy industry. We are a dynamic and customer satisfaction-oriented company that is focused on helping its customers improve on multiple levels, not just with their well control needs. No matter what we are doing for the customer, we deliver extraordinary service that is superior to any of our competitors. Located at 1249 Evangeline Thruway, Broussard, Louisiana 70518 - [Tweet](https://twitter.com/share) [![Welcome to the Team! Nicolas Rogozinski, Chief of Engineering Solutions](https://mm-intl.com/hubfs/Welcome%20to%20the%20Team%20%281%29.png)](https://mm-intl.com/blog/welcome-to-the-team-nicolas-rogozinski-chief-of-engineering-solutions) #### [Welcome to the Team! 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[Partners](https://mm-intl.com/blog/tag/partners) [Authorized Repair Facility](https://mm-intl.com/blog/tag/authorized-repair-facility) [North Dakota](https://mm-intl.com/blog/tag/north-dakota) [Read More](https://mm-intl.com/blog/mm-international-partnership-with-recon-oilfield-services) [![M&M International Now Licensed for API 7V](https://mm-intl.com/hubfs/Untitled%20%28Facebook%20Post%29.png)](https://mm-intl.com/blog/mm-international-now-licensed-for-api-7v) #### [M&M International Now Licensed for API 7V](https://mm-intl.com/blog/mm-international-now-licensed-for-api-7v) ![Picture of M&M International](https://mm-intl.com/hs-fs/hubfs/_(250%20x%20250%20px)%20(3).png?width=30&name=_(250%20x%20250%20px)%20(3).png) [M&M International](https://mm-intl.com/blog/author/mm-international): Feb 26, 2026, 10:14:56 AM M&M International Now Licensed for API 7V Kelly Valves & IBOPs — A New Era in Well Control Valve Manufacturing [Manufacturing](https://mm-intl.com/blog/tag/manufacturing) [IBOPs](https://mm-intl.com/blog/tag/ibops) [API 7V](https://mm-intl.com/blog/tag/api-7v) [Licenses](https://mm-intl.com/blog/tag/licenses) [Kelly Valve](https://mm-intl.com/blog/tag/kelly-valve) [Read More](https://mm-intl.com/blog/mm-international-now-licensed-for-api-7v) [![Innovations in Drill Stem Safety Valves](https://mm-intl.com/hubfs/Featured%20Images/Blog%20Drill%20Stem%20Safety%20Valves.png)](https://mm-intl.com/blog/innovations-in-drill-stem-safety-valves) #### [Innovations in Drill Stem Safety Valves](https://mm-intl.com/blog/innovations-in-drill-stem-safety-valves) ![Picture of M&M International](https://mm-intl.com/hs-fs/hubfs/_(250%20x%20250%20px)%20(3).png?width=30&name=_(250%20x%20250%20px)%20(3).png) [M&M International](https://mm-intl.com/blog/author/mm-international) : Dec 3, 2024, 5:35:00 PM In the high-stakes world of oil and gas drilling, operational safety is paramount. Drill Stem Safety Valves play a critical role in ensuring the... [Oil & Gas](https://mm-intl.com/blog/tag/oil-gas) [Top Drive Safety Valves](https://mm-intl.com/blog/tag/top-drive-safety-valves) [Ball Valves](https://mm-intl.com/blog/tag/ball-valves) [Manufacturing](https://mm-intl.com/blog/tag/manufacturing) [Engineering](https://mm-intl.com/blog/tag/engineering) [CANISTER GUARD®](https://mm-intl.com/blog/tag/canister-guard) [Read More](https://mm-intl.com/blog/innovations-in-drill-stem-safety-valves) [![Understanding Inside Blow-Out Preventers](https://mm-intl.com/hubfs/Featured%20Images/IBOPs%20.png)](https://mm-intl.com/blog/understanding-inside-blow-out-preventors) #### [Understanding Inside Blow-Out Preventers](https://mm-intl.com/blog/understanding-inside-blow-out-preventors) ![Picture of M&M International](https://mm-intl.com/hs-fs/hubfs/_(250%20x%20250%20px)%20(3).png?width=30&name=_(250%20x%20250%20px)%20(3).png) [M&M International](https://mm-intl.com/blog/author/mm-international) : Oct 9, 2024, 6:05:49 PM Inside Blow-Out Preventers (IBOPs) are critical safety components in the oil and gas industry, designed to provide a fail-safe mechanism for... [Oil & Gas](https://mm-intl.com/blog/tag/oil-gas) [Manufacturing](https://mm-intl.com/blog/tag/manufacturing) [Engineering](https://mm-intl.com/blog/tag/engineering) [IBOPs](https://mm-intl.com/blog/tag/ibops) [Read More](https://mm-intl.com/blog/understanding-inside-blow-out-preventors) [![How Kelly Valves, Crossover Subs, and Saver Subs Enhance Operations](https://mm-intl.com/hubfs/Featured%20Images/Kelley%20Valve%2c%20Crossover%20Sub%20Valve%20and%20Safer%20Sub%20Valve%20by%20M%26M%20International%20(1)%20(1).png)](https://mm-intl.com/blog/drilling-versatility-with-kelley-valves-crossover-subs-saver-subs) #### [How Kelly Valves, Crossover Subs, and Saver Subs Enhance Operations](https://mm-intl.com/blog/drilling-versatility-with-kelley-valves-crossover-subs-saver-subs) ![Picture of M&M International](https://mm-intl.com/hs-fs/hubfs/_(250%20x%20250%20px)%20(3).png?width=30&name=_(250%20x%20250%20px)%20(3).png) [M&M International](https://mm-intl.com/blog/author/mm-international) : Jan 7, 2025, 7:22:00 PM Drilling operations have always faced a crucial question: how can efficiency, safety, and performance be maximized simultaneously? The answer lies in... 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