5/16"-18 × 1‑1/2" Carriage Bolt – Grade 8, Plain Finish

Engineered for high‑strength fastening where added length and durability are required, the 5/16"-18 × 1‑1/2" Grade 8 carriage bolt provides dependable clamping performance in demanding applications. The smooth, domed head creates a clean exterior finish, while the square neck is designed to seat firmly into wood or metal to prevent rotation during installation. Manufactured from heat‑treated alloy steel, this Grade 8 fastener delivers superior tensile strength for load‑bearing and high‑stress assemblies. The plain, uncoated finish is ideal for controlled environments or applications where coatings are unnecessary. Commonly used in machinery, equipment frames, fixtures, and structural connections requiring secure, long‑reach fastening.