3/8 Galvanized Hex Nuts for Structural Builds

Hillman Paulin 3/8"-16 Finished Hex Nuts - Galvanized Grade 2 UNC. 

Hex nuts are one of the most essential fastener components on any job site — and using the right one for the application is not optional. At The Contractors Site, we supply 3/8 galvanized hex nuts for contractors, framers, and tradespeople across Ontario who need reliable, corrosion-resistant hardware for structural, outdoor, and pressure-treated lumber connections.

These 3/8"-16 finished hex nuts are hot dipped galvanized Grade 2 UNC, designed to pair perfectly with 3/8" hot dipped galvanized carriage bolts and other galvanized structural fasteners. Engineered for strength, durability, and corrosion resistance, they are ideal for exterior wood construction, deck building, fencing, pergolas, and general structural applications where long-term performance in harsh outdoor environments is critical.

Hot dipped galvanized hex nuts offer a thick zinc coating that delivers superior rust and corrosion protection compared to standard zinc-plated hardware, making them a cost-effective alternative to stainless steel for treated lumber, coastal locations, and high-moisture conditions. The hex design provides a solid grip for wrenches or sockets, allowing fast, secure installation and removal on job sites, in construction, automotive, machinery, and industrial applications.

Why the Right Hex Nut Matters for Structural Work

On a 3/8 bolt connection — whether it's a ledger board, a deck beam connection, or a structural hardware assembly — the hex nut is the component that controls clamping load and long-term joint integrity. A cheap or incorrect nut strips out, loosens under vibration, or corrodes before the structure does. Our galvanized hex nuts are graded for the load demands that Ontario construction puts on every fastener.

Key features

• Size: 3/8"-16 finished hex nuts, UNC coarse thread for use with 3/8" galvanized carriage bolts and other UNC bolts

• Finish: hot dipped galvanized plating for excellent corrosion and rust resistance in outdoor and harsh environments

• Material: low carbon steel, Grade 2, providing reliable strength for general structural and construction use

• Grade 2 hex nuts are not required to be marked for grade identification, simplifying visual inspection

• Matte gray galvanized finish matches hot dipped galvanized carriage bolts and other exterior fasteners for a consistent look

• Designed for use in construction, automotive, machinery, and equipment assemblies where durability is required

• Galvanized fasteners provide a cost-effective solution compared to stainless steel while still offering strong protection against environmental elements

• Minimum tensile strength of 74,000 psi, suitable for many common building and repair applications

Use these 3/8"-16 hot-dipped galvanized Grade 2 hex nuts with galvanized carriage bolts, lag bolts, and structural fasteners when assembling decks, fences, pergolas, sheds, and outdoor framing. Matching the galvanized nut to the galvanized bolt helps prevent galvanic corrosion, ensures proper clamping force, and delivers a long-lasting, code-compliant connection for professional contractors and serious DIY builders.