Fractional Size Grade 5 Carriage Bolt with Plain Finish

Fractional Size Grade 5 Carriage Bolt with Plain Finish

Fractional Size Grade 5 Carriage Bolts with Plain Finish are high-strength fasteners engineered for demanding wood-to-wood and wood-to-metal applications. Designed for structural integrity and secure clamping performance, these heat-treated carriage bolts are ideal for heavy-duty construction, equipment assembly, agricultural machinery, and industrial fabrication. When greater strength is required than standard low carbon bolts can provide, Grade 5 carriage bolts deliver dependable performance.

Grade 5 Heat-Treated Strength

Manufactured from medium carbon steel and heat-treated to meet SAE Grade 5 specifications, these carriage bolts offer significantly higher tensile strength than Grade 2 or A307 fasteners. The increased load capacity makes them suitable for applications involving vibration, shear stress, and moderate structural loads. Grade 5 hardware is commonly used in mechanical assemblies, trailer components, heavy timber construction, and reinforced framing systems.

Domed Head with Square Neck Design

The smooth, round domed head provides a finished appearance without exposed wrench flats, making it ideal for visible installations. Beneath the head, the square neck is designed to embed into wood or softer materials during tightening, preventing the bolt from spinning. This anti-rotation feature allows for efficient installation by tightening the nut from one side using a wrench or socket, saving time during assembly.

Plain Finish for Dry Applications

The plain, uncoated steel finish maintains the raw strength of the heat-treated material. Best suited for indoor or controlled environments, this finish provides a cost-effective solution where corrosion resistance is not a primary concern. For exterior use, additional protective coatings may be recommended.

Key Specifications

• Size: Fractional diameters

• Grade: SAE Grade 5

• Finish: Plain (uncoated steel)

• Head Style: Round domed head with square neck

Fractional Size Grade 5 Carriage Bolts with Plain Finish provide high-strength, reliable fastening for structural and industrial applications requiring enhanced load performance.