API 11B Sucker Rod Couplings

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1. Introduction of rod coupling

The sucker rod coupling have the same box thread size in each end are used for connecting sucker rod and/or pony rod, and/or sinker bars with sucker rod threads.

The polished rod coupling have the same box thread size in each end are used for connecting polished rod and/or sinker bars with polished rod threads to the sucker rod string.

The sub-coupling have different sizes of box threads in each end are used for connecting two sizes of sucker rods or a polished rod to a sucker rod string.


2. Manufacturing specification: API 11B


3. Material

3.1. Chemical Composition

The material shall be per manufacturer’s specification and shall have a maximum sulfur content of 0.05%.

3.2. Mechanical Properties

Mechanical properties shall be in accordance with the manufacturer’s specification with a minimum tensile strength of 95,000psi(655MPa). One of the following means shall be used to conform to the tensile requirements:

---determination of the metal material hardness of 56 to 62 HRA inclusive; or

---material test report per 6.3.2.2 for the heat of steel from the original mill if further processing does not change mechanical properties; or

---a tensile test per ASTM A370, OR ISO 6892 with s minimum of two tests performed after final thermal processing.


4. Sprayed metal coating requirements

4.1. Chemical composition

Elements

Minimum Mass(weight) Percent

Maximum Mass(weight) Percent

Carbon

0.50

1.00

Silicon

3.50

5.50

Phosphorus

0.00

0.02

Sulfur

0.00

0.02

Chromium

12.00

18.00

Boron

2.50

4.50

Iron

3.00

5.50

Cobalt

0.00

0.10

Titanium

0.00

0.05

Aluminum

0.00

0.05

Zirconium

0.00

0.05

Nickel

Remainder


4.2. Coating thickness

Spraying metal coating thickness is 0.010in to 0.020in. (0.25mm to 0.51mm) per side and cover the outside diameter. Spraying metal coating shall extend to the outside diameter of the contact face.


5. Specification


Size

5/8 in

3/4 in

7/8 in

1 in

1-1/8 in

in

mm

in

mm

in

mm

in

mm

in

mm

Full size sucker rod coupling, polished rod coupling, Sub-coupling

Outside diameter

1.500

38.10

1.625

41.28

1.812

46.00

2.187

55.60

2.375

60.33

Length

4.000

101.6

4.000

101.6

4.000

101.6

4.000

101.6

4.500

114.3

Slim hole sucker rod coupling, polished rod coupling, Sub-coupling

Outside diameter

1.250

31.80

1.500

38.10

1.625

41.30

2.000

50.80

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Length

4.000

101.6

4.000

101.6

4.000

101.6

4.000

101.6

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