Hillman Fasteners 240078 5/16-18x1 Carriage Bolt 100 Pack

Product Description

The HILLMAN FASTENERS 240078 is a 5/16-18 x 1 inch coarse-thread carriage bolt with a steel round head and square neck, sold in a 100-count pack. The square neck locks into wood or soft material to prevent rotation during tightening, eliminating the need to hold the bolt head. These are a standard fastener used across mechanical, structural, and trade assembly applications. The coarse 5/16-18 thread pitch drives quickly and holds reliably in wood, metal brackets, and general-purpose framing connections.

These carriage bolts are suited for residential and light commercial construction, HVAC equipment mounting, duct support framing, electrical enclosure assembly, fence and deck work, and general mechanical assembly where a flush or recessed fastener head is required. The 100-count pack is sized for job-site use where multiple connections are made in a single work session. Installers working in plumbing, HVAC, and electrical trades commonly stock this size for equipment support and structural attachment tasks.

Key Features

• 5/16-18 coarse thread for fast engagement and strong holding power in wood and metal
• Square neck self-locks into substrate to prevent spinning during nut tightening
• Steel construction for general-purpose structural and mechanical use
• Round dome head provides a finished, low-profile appearance on exposed connections
• 100-count pack reduces restocking interruptions on multi-connection jobs

Compatibility

Designed as a standard 5/16-18 x 1 inch coarse-thread carriage bolt suitable for general-purpose structural and mechanical fastening applications across construction and trade service work.

Installation Notes

Carriage bolts are typically installed by pulling the square neck firmly into the substrate before torquing the nut from the threaded end. Power down or de-energize any equipment before fastening near electrical components. A standard combination wrench or socket set is used to tighten the nut; no special tooling is required for the bolt head. Follow applicable structural or equipment manufacturer torque guidelines where specified.