Product Item: API 11B Sucker Rod Coupling, Sucker Rod without Wrench Flat
Type: Coupling
Standard: API 11B
Material: 40Cr Steel
Size: 1 Inch * 7/8 Inch, Full Size
Coating: Non-Metallic Phosphate Coating
Thread: 7/8 Inch API Box to 1 Inch API Box
Source: https://www.landee.cn/api-11b-sucker-rod-coupling-40cr-steel-1-inch-7-8-inch.html
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