5/8 Galvanized Steel Washers for Contractors

Hillman Paulin 5/8"  Hot Dipped Galvanized Washers – Heavy-Duty Exterior Fastener for Wood Construction etc. 

The right washer does more than sit under a bolt head — it protects your material, spreads the clamping load, and keeps connections from pulling through over time. At The Contractors Site, our 5/8 galvanized steel washers are stocked for Ontario contractors and tradespeople who need reliable fastener hardware on every structural and exterior build.

Upgrade your fastening projects with these 5/8" galvanized flat washers, engineered to spread the load of 5/8" bolts and screws and protect your work surface from damage. Each washer sits between the fastener and the material, helping to prevent indentation, buckling, and pull‑through in wood, metal, and other construction materials while improving overall joint strength. The hot‑dipped galvanized finish offers excellent corrosion resistance, making these flat washers a strong choice for exterior construction, decks, fences, outdoor structures, and other demanding environments.

These 3/8" galvanized washers are sized to match 3/8" diameter bolts and screws for a proper fit and consistent clamping force. Using washers that match your fastener diameter helps maintain alignment, improve load distribution, and reduce the risk of loosening over time. For best results and to avoid galvanic corrosion, pair these washers with galvanized or zinc-coated fasteners of a similar finish, especially in outdoor or high-moisture locations.

Why Washers Matter on Every Fastener Assembly

A missing or undersized washer is one of the most common causes of fastener pull-through on structural connections. For 5/8 bolts used in heavy timber framing, ledger connections, and deck builds, a properly sized galvanized washer distributes the load across a wider bearing surface — protecting the wood fibre and keeping the connection solid over time. It's a small part that earns its place on every serious build.

Key features

• 5/8" galvanized flat washers for use with 5/8" bolts and screws in construction and general fastening.

• Distributes load over a larger surface area to help prevent material crushing, deformation, and fastener pull‑through.

• Hot‑dipped galvanized finish provides strong corrosion and rust resistance for outdoor and high‑moisture applications.

• Ideal for decks, fences, framing, structural connections, machinery, and general hardware installations.

• Designed to sit under the bolt head or nut for a more secure, long‑lasting connection.

• Washer size corresponds to fastener diameter; matches 5/8" galvanized or zinc‑plated bolts, lag screws, and machine screws.