Hillman Fasteners 240198 3/8-16x7 Carriage Bolt 50 Pack

Product Description

The HILLMAN FASTENERS 240198 is a 3/8-16 x 7 inch steel carriage bolt designed for structural fastening applications in wood, metal, and composite materials. It features a round dome head and a square neck that bites into the material surface on installation, preventing the bolt from spinning without a wrench or pliers on the bolt head. The coarse 3/8-16 thread pitch provides strong pull-through resistance and allows faster assembly in wood-to-wood and wood-to-metal connections. Each box contains 50 bolts, making it practical for production work and batch repair jobs. Licensed contractors, carpenters, and general tradespeople routinely use this size for deck framing, dock construction, playground equipment, and structural bracing.

The 240198 carriage bolt suits residential and light commercial construction where a smooth, low-profile head is required on the visible face of a connection. Common applications include attaching ledger boards, joining heavy timber framing members, securing railings and posts, and assembling structural panels. The 7 inch length accommodates thicker material stacks where shorter fasteners fall short. The 50-count pack supports multi-connection jobs without frequent restocking interruptions.

Key Features

• 3/8-16 coarse thread for fast engagement and reliable holding strength in wood and metal
• 7 inch length handles thick material assemblies and multi-layer structural connections
• Round dome head provides a clean, low-profile appearance on the finished face
• Square neck locks the bolt against rotation during nut tightening without tools on the head
• Steel construction for load-bearing structural use
• 50-bolt pack quantity reduces per-unit cost on volume fastening work

Compatibility

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

Installation Notes

Carriage bolts are typically installed by a carpenter or general contractor using a hammer to seat the square neck flush into the material, followed by a flat washer and hex nut tightened with a wrench. Pre-drilling a clearance hole equal to the bolt diameter is required to prevent wood splitting and ensure proper square-neck seating. Follow applicable building codes, including IRC and local structural requirements, for minimum fastener schedules in load-bearing assemblies. Do not overtorque the nut on softwood assemblies, as the square neck can pull through the material.