The couplings are used to join sucker-rods to each other.
|Normative documents||TU 3665-020-48416997-2003|
|Outside diameter, mm||- Full-size: 60.3; 55.6; 50.8; 46; 41.3; 38.1
- Slimhole 50.8; 41.3; 38.1; 31.8
|Wear resistance coating at outer surface||- Heat treated without coating - Т
- High frequency current hardened - S
|Steel grade||Structural carbon alloy steel|
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