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Crossover sub is mainly used to connect upper and lower drill tools in different connectors in drilling operations. Also it can be used to protect other tooling in drill stem (called saver sub) or be used to deliver outgoing air to the bit face just above the bit (called bit sub).
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 with AISI 4145H, AISI 4145H Mod, AISI 4340, AISI 4140-4142 and Non-magnetic material. All connections are phosphate-coated or copper plated to improve resistance to corrosion. Crossover subs come in three basic types: A Pin (male) * Box (female); B Pin (male) * Pin (male); C Box (female) * Box (female)
| Crossover Sub Selection Guide | |||
| Description | Upper Connection Part | Lower Connection Part | Type |
| Kelly cross-over sub | Kelly | Drill pipe | A or B |
| Drill pipe cross-over sub | Drill pipe | Drill pipe | A or B |
| Interim cross-over sub | Drill pipe | Drill collar | A or B |
| Drill collar cross-over sub | Drill collar | Drill collar | A or B |
| Drill bit cross-over sub | Drill collar | Drill bit | A or B |
| Swivel cross-over sub | Swivel lower sub | Kelly | C |
| Fishing cross-over sub | Kelly/Drill pipe | Drill pipe/Fishing tools | C |
| ** Crossover sub can be customized as per customer's design. | |||
A full line of equipment is supplied for O&G, horizontal directional drilling (HDD), micro-tunnelling, pipe jacking, etc. In the O&G section, drilling rig components, downhole drilling tools, fishing tools, tubular handling tools, well control equipments, drilling fluid mixing & recycling systems, solids control equipment, and other relevant oil tools are available.
All products are American Petroleum Institute certified and authorized by ISO: 9001-2000. With advanced production facilities and rigorous quality management, operations have expanded globally to Italy, Germany, Poland, UAE, Kuwait, Egypt, & South East Asia.
