3. Thread type: EUE box *EUE box, EUE box *EUE pin, EUE box *NUE box, EUE box *NUE pin, EUE pin *NUE box, EUE pin *NUE pin, NUE box *NUE box, NUE pin*NUE pin

4. Length: As customer’s required

api crossover sub:

It is divided into drill string crossover and tubing Crossover.

Drill string Cross-over is divided into type A, type B and type C.

Crossover sub specification

Denotation	Top junction block	Lower junction block	Type
Kelly joint	Kelly	Drill pipe joint	A or B
Kelly joint	Drill pipe joint	Drill pipe joint	A or B
Drill pipe joint	Kelly	Drill collar	A or B
Crossover joint	Drill collar	Drill collar	A or B
Bit joint	Drill collar	Bit	A or B
Swivel joint	Swivel lower joint	Kelly	Type C
Fish joint	Kelly	Drill pipe joint	Type C
Fish joint	Drill pipe joint	Fishing tool	Type C

drilling crossover sub mechanical properties:

O.D. Range	Min. Yield Strength	Min. Tensile strength	Elongation Min.	Min. Brinell Hardness
3.1/2 THRU 6.7/8	760Mpa	965Mpa	13%	285
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