5/8"-11 × 5‑1/2" Carriage Bolt – Grade 8, Plain Finish

Manufactured for extra‑long fastening applications that demand high strength and reliability, the 5/8"-11 × 5‑1/2" Grade 8 carriage bolt is ideal for heavy‑duty structural and industrial use. The smooth, domed head provides a clean exterior finish and helps distribute clamping force evenly, while the square neck is designed to draw tightly into wood or metal to prevent rotation during tightening. Produced from heat‑treated alloy steel, this Grade 8 fastener offers exceptional tensile strength suitable for load‑bearing and high‑stress assemblies. The plain, uncoated finish is well suited for controlled environments or installations where surface coatings are not required. Common applications include machinery frames, equipment mounts, structural supports, and industrial fixtures requiring extended reach and dependable fastening strength.