Sub sucker rod coupling:
1) Material: Seamless Alloy Steel 40Cr (AISI 5140)
2) Standard: API Spec 11B
3) Type: Full Size and Slim Hole
4) Grade: T, SM
5) Other Size: 5/8"*3/4"; 7/8"* 1"; 1"* 1-1/8"
6) Characters: It is used to connect different sizes of Sucker Rod or to connect the Polish Rod to Sucker Rod string.
Wooden case, international seaworthy package.
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