3/8"-16 × 4" Carriage Bolt – Grade 8, Plain Finish

Engineered for extra‑long fastening applications that demand high strength, the 3/8"-16 × 4" Grade 8 carriage bolt delivers reliable performance in heavy‑duty assemblies. The smooth, rounded head provides a clean exterior appearance, while the square neck is designed to anchor securely into wood or metal to prevent rotation during tightening. Manufactured from heat‑treated alloy steel, this Grade 8 fastener offers high tensile strength suitable for structural and load‑bearing use. The plain, uncoated finish is ideal for controlled environments or applications where surface coatings are not required. Commonly used in machinery frames, equipment mounts, fixtures, and structural connections requiring extended reach and dependable clamping force.