Crossover Sub
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The crossover sub is a drill string component that helps convert and connect drill stem components. Crossover subs help extend the life of certain oil tools by connecting lower drill tools and upper drill tools that do not match.
Specifications| Item | Description | Upper connection | Lower connection | Size | Type |
| 1 | Kelly crossover sub | Kelly | Drill pipe | All size | A or B |
| 2 | Drill pipe crossover sub | Drill pipe | Drill pipe | All size | A or B |
| 3 | Crossover sub | Drill pipe | Drill collar | All size | A or B |
| 4 | Drill collar Crossover sub | Drill collar | Drill collar | All size | A or B |
| 5 | Drill Bit crossover sub | Drill collar | Drill bit | All size | A or B |
| 6 | Swivel crossover sub | Swivel lower sub | Kelly | All size | C |
| 7 | Fishing crossover sub | Kelly | Drill pipe | All size | C |
| Drill pipe | Fishing tool | All size | C |
Note:
Type A: One crossover has one same OD.
Type B: One crossover has two sizes OD.
Type C: The connection type is left hand type.
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