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
7	Fishing crossover sub	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.