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Adopts grade 12.9 high-strength alloy steel, black oxide finish, high hardness, wear-resistant and anti-loosening. US standard UNC coarse thread 1/4-20, stable matching, firm connection, not easy to slip. Hex socket head cap design, convenient for installation with Allen wrench, large torque and stable locking. Length range from 3/8" to 4", complete specifications to meet different mechanical assembly demands. Suitable for industrial machinery, equipment maintenance, auto parts, molds and other high-strength fastening scenes.