Common sucker rod coupling conforms to... |
This kind of collar up to the standard API Spec 11 b and SY/T5029-2006 requirements, main specifications have 5/8/3/4 (SM), 3/4/7/8 T (SM), 7/8/1 T (SM), 1/11/8 T (SM) also can be customized according to user requirements
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