5/16"-18 × 1‑1/4" Carriage Bolt – Grade 8, Plain Finish

Designed for medium‑length fastening in high‑strength applications, the 5/16"-18 × 1‑1/4" Grade 8 carriage bolt delivers dependable performance where standard fasteners fall short. The domed head provides a smooth, finished appearance, while the square neck locks into wood or metal to prevent spinning during tightening. Manufactured from heat‑treated alloy steel, this Grade 8 fastener offers excellent tensile strength and durability for load‑bearing assemblies. The plain, uncoated finish is well suited for controlled environments or applications where surface coatings are not required. Commonly used in machinery, equipment frames, fixtures, and structural connections requiring secure, high‑load fastening.