Value Collection 489052PS Carriage Bolt 5/16-18 3 in Zinc Grade 2

Product Description

The VALUE COLLECTION 489052PS is a 5/16-18 carriage bolt with a 3-inch length under the head, manufactured from Grade 2 steel with a zinc-plated finish. The square neck under the dome head resists rotation when the nut is tightened, eliminating the need for a wrench on the bolt side. This fastener meets ASTM A307 standards and is sized in the inch measurement system with Unified National Coarse (UNC) threading. It is suited for general-purpose structural and mechanical assembly work across construction, maintenance, and fabrication trades.

This carriage bolt is used in light-to-medium structural connections where a smooth, rounded head and a self-locking square neck are required. Typical applications include wood-to-wood connections, bracket mounting, and general hardware assembly in residential construction and industrial maintenance environments. The zinc finish provides basic corrosion resistance for indoor and sheltered outdoor use.

Key Features

• 5/16-18 UNC thread for compatibility with standard inch-series nuts and hardware
• Square neck under head locks the bolt in place during nut tightening without requiring a second tool
• Grade 2 steel construction suitable for general-purpose, non-critical structural fastening
• Zinc-plated finish offers basic corrosion protection for sheltered environments
• Meets ASTM A307 fastener standard for general-use bolts
• 3-inch length under head accommodates standard lumber and bracket stacking depths

Compatibility

Designed as a general-purpose inch-series carriage bolt for use with 5/16-18 UNC nuts and washers in standard wood and light structural assembly applications.

Installation Notes

Installation typically requires a wrench or socket on the nut side only — the square neck seats into the substrate to hold the bolt stationary. Pre-drill a clean hole sized to allow the square neck to seat flush without splitting the material. Ensure the mating surface is flat so the dome head draws down evenly. Follow applicable building codes and structural specifications for fastener spacing and load requirements.