Unionlever (Group) Petroleum Equipment Co.,Ltd.

Cross-Over Sub(Rotary Sub)

Cross-Over Sub

Cross-over sub acts for conversion and connection of drill stem component in petroleum, natural gas and geology drilling work.
It is used mainly for connecting of upper drill tools and lower drill tools during drilling operations.

The cross over sub in 4 types of main structure

Sort

Description

Upper Connection Part

Lower Connection Part

Type

1

Kelly cross-over sub

Kelly

Drill pipe

A or B

2

Drill pipe cross-over sub

Drill pipe

Drill pipe

A or B

3

Interim cross-over sub

Drill pipe

Drill collar

A or B

4

Drill collar cross-over sub

Drill collar

Drill collar

A or B

5

Drill bit cross-over sub

Drill collar

Drill bit

A or B

6

Swivel cross-over sub

Swivel lower sub

Kelly

C

7

Fishing cross-over sub

Kelly

Drill pipe

C

Drill pipe

Fishing tools

C


    Type A stand for same diameter : one crossover sub has one size (D)on O.D., code A.
    Type B stands for reduce type: one crossover sub has two sizes (D1,D2) on O.D., code B.
    Type C is left hand thread type: the connection thread is left hand type, code C.



Scification of Tubing Cross- Joint

External Thread
Internal Thread
Thread Code Name
Tapering
Large End Diameter
Small End
Diameter
I.D.
(mm)
Thread Code
Name
Tapering
LargeEnd Diameter
Small End Diameter
I.D.
(mm)
1.900TBG
1:16
48.3
47
40.3
1.900TBG
1:16
55.9
66.1
49.9
2-3/8TBG
1:16
60.3
59
40.3
2-3/8TBG
1:16
73.0
58.1
61.9
2-7/8TBG
1:16
73
70
62
2-7/8TBG
1:16
88.9
70.8
74.6
3-1/2TBG
1:16
88.9
86
76
3-1/2TBG
1:16
108.0
86.7
90.5
4TBG
1:16
101.6
98
88
4TBG
1:16
120.6
98.5
103.2
4-1/2TBG
1:16
114.3
111
100.3
4-1/2TBG
1:16
132.1
111.2
115.9
4-1/2BCSG
1:16
114.7
112
100
1.900UPTBG
1:16
63.5
51.0
54.8
1.900UPTBG
1:16
53.2
51
40.3
2-3/8UPTBG
1:16
77.8
62.8
67.5
2-3/8UPTBG
1:16
65.9
64
50.3
2-7/8UPTBG
1:16
93.2
75.5
80.2
2-7/8UPTBG
1:16
78.6
76
62
3-1/2UPTBG
1:16
114.3
92.2
96.9
3-1/2UPTBG
1:16
95.2
92
75.9
4UPTBG
1:16
127.0
104.9
109.6
4UPTBG
1:16
108.0
104
88.6
4-1/2UPTBG
1:16
141.3
117.6
122.3
4-1/2UPTBG
1:16
120.6
117
100.3
 
 
 
 
 
 

How to order Cross-over Subs
When ordering, please specify:
• O.D.,I.D., and length.
• Connections, size, and type.

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