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The outer edge of the head of the hexagon socket head bolt is round, and the middle is a recessed hexagon.
High-strength hexagon socket head bolts have the advantages of being countersunk, easy to fasten and disassemble, not easy to slip, fatigue-resistant, and not loose under dynamic loads.
Hexagon socket-head cap bolts are widely used in construction, mechanical equipment, electrical, electric power, chemical industry, water conservancy, railway, aerospace, and other fields.
