R28 Coupling sleeve is one of our products ,we can make R28 thread coupling and also R225 R32 R38 etc , the coupling can connect drill rod and shank , it usually used in the field of anchor bolting , R28 thread coupling we have right thread and left thread ,the material we have a few of area , 45# steel , 40Cr, 42CrMo, 35CrMoV ,and 23CrNi3Mo, Using different materials in different fields .
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