Couplings produced by our factory include sucker rod coupling, sub-coupling, API 5CT tubing and casing coupling. Sucker rod coupling and sub-coupling are designed in accordance with API Spec 11B, the material is high quality alloy steel. Normally, there are 2 wrench flats on the outside diameter. Class T coupling hardness is HRA56-62 after heat treatment, possesing better anti-corrosion property and abrasion-proof property.
Sucker rod coupling is used for connecting the same size of sucker rods. Sub-coupling is used for connecting the two sizes of sucker rods or polished rod to a sucker rod string.
|Coupling O.D (+0.13,-0.25) (mm)||41.3||46.0||55.6|
|Threaded D.(in)||1 1 /16||1 3 /16||1 3 /8|
|Lengh of wrench square (mm)||31.8||31.8||38.1|
|Lengh (+1.57,0.00) (mm)||101.6|
|Hardness ( HRA )||56-62|