Bolts with tamper-proof designs for security-3/8-16 X 3in UNC Grade 5 Full Thread Carriage Bolt Clear Zinc

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Made from medium carbon steel, this 3/8-16 x 3 Grade 5 carriage bolt has a round head with a square next under the head and is fully threaded. The square neck is designed to keep the bolt from turning as a nut is tightened. Proof Load is 85,000 PSI with a minimum Yield Strength of 92,000 PSI and Tensile Strength of 120,000 PSI. (CB383C5Z)