API Sucker Rod Coupling with Big Chamfer

1)Features: spray welding in general based on the hoop increases the exteral chamfer at both ends, greatly reducing the contact with the pipeline, but also by friction, abrasion resistance, extended collar and tubing life.
2)Meterial:International 40Cr, AISI5140(seamless alloy steel)
3)Standard: API Spec 11B
4)Grade: SM class and T class
5)Type: full size
6)Size:5/8"; 3/4"; 7/8"; 1"; 1-1/8"

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