Hillman Fasteners 812587 Carriage Bolt 3/8-16 X 4 in 50 Pack

Product Description

The HILLMAN FASTENERS 812587 is a galvanized steel carriage bolt used to create secure, tamper-resistant fastened connections in structural and general trade applications. Each bolt features a round head, square neck, and coarse thread pattern in a 3/8-16 x 4-inch configuration. The square neck locks into wood or soft material to prevent spinning during installation, eliminating the need for a wrench on the bolt side. Sold in a 50-count box, this SKU is suited for contractors and tradespeople who need reliable fasteners in volume. The galvanized coating provides corrosion resistance for both interior and exterior use.

This carriage bolt is commonly used in wood-to-wood and wood-to-metal connections across residential and light commercial construction. Typical applications include decking, fencing, framing, HVAC equipment mounting, and electrical or plumbing support structure assembly. The 3/8-16 coarse thread pattern is standard for general structural fastening where high vibration or fine-thread engagement is not required. The 50-pack quantity suits service vans, job-site bins, and supply rooms where replenishing common fastener sizes frequently.

Key Features

• 3/8-16 x 4-inch galvanized steel carriage bolt for corrosion-resistant structural fastening
• Round head with square neck prevents bolt rotation during nut tightening
• Coarse thread pattern for fast engagement in wood and soft-base materials
• Galvanized finish rated for interior and exterior environments
• 50-count pack supports volume fastening tasks and job-site restocking

Compatibility

Designed as a standard 3/8-16 coarse-thread carriage bolt suitable for use with any 3/8-16 hex nut and standard flat or lock washer in structural wood and light metal fastening applications.

Installation Notes

Carriage bolts are typically installed by tradespeople and general contractors using a hammer to seat the square neck flush into the substrate, then securing with a 3/8-16 hex nut and washer using a wrench or socket. Always pre-drill a hole matching the bolt shank diameter to prevent splitting in wood substrates. Follow applicable building codes, including IBC or local structural requirements, when using carriage bolts in load-bearing assemblies. Torque to specification per the project engineer or applicable code — do not over-drive, as this can strip the square neck seat.