Mazhuang Village, Yuhe Town, Huixian City, Xinxiang City, Henan Province, China
Copper sleeve; Mechanical testing method; Hardness testing
Bearing; Inspection and replacement; Wear resistant and practical
Bearing; Copper alloy fittings; customized
Copper sleeve; out-of-flatness; Copper alloy accessories
Processing and production; Copper nut; Non standard customization
Copper nut; Classification; Copper alloy accessories