We are able to provide customers with sucker rods,pony rods,sinker bars,sucker rod couplings,tubing couplings,casing couplings. Ordinary sizes and mechanical properties of steel sinker barExternal diameter (0,-0.76)external thread dimensions (mm)Wrench square width mm±0.8Wrench square length mmSinker bar length mm±50.8Mechanical properties1 1/4(31.75)5/8(15.9)SR25.431.87600, 91001、Class-1 tensile ...