... of OriginShandong, China (Mainland)Brand NameYUNSHENGModel NumberAPI 11B 5/8" SM FS ROD COUPLINGMATERIALALLOY STEEL BAR, AISI 5140OUT DIAMETER38. ... 1mm (1.1/2")INNER DIAMETER23.81mm(15/16")UNIT WEIGHT0.56kgSURFACE TREATMENTPHOSPHATINGSPRAY WELD THICKNESS0.254mm~0.508mm(0.01in ... SIZE, SLIM HOLE, OVER SIZETHREAD SIZES5/8", 3/4", 7/8", 1", 1.1/8"USAGEJOINNING TWO SUCKER RODS TOGETHER FOR DOWNHOLEOIL ...