3/8 Galvanized Carriage Bolt & Washer Hardware

Hillman Paulin 3/8"  Hot Dipped Galvanized Washers – Heavy-Duty Exterior Fastener for Wood Construction etc. 

A carriage bolt is only as solid as the hardware paired with it. At The Contractors Site, we supply 3/8 galvanized carriage bolts alongside matching washers for Ontario contractors, deck builders, and framers who need a clean, corrosion-resistant fastening assembly that holds under load and holds up outdoors.

Upgrade your fastening projects with these 3/8" galvanized flat washers, engineered to spread the load of 3/8" 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, improves load distribution, and reduces the risk of loosening over time. For best results and to avoid galvanic corrosion, pair these washers with galvanized or zinc‑coated fasteners with a similar finish, especially in outdoor or high‑moisture locations.

Galvanized for Ontario Outdoor Builds

Our 3/8 carriage bolt and washer hardware is hot-dip galvanized and ready for the exposure conditions that Ontario job sites bring — treated lumber, exterior decking, fence and gate hardware, and structural connections that face seasons of moisture, UV, and freeze-thaw cycling. Galvanized is not optional on outdoor builds; it's the standard.

Key features

• 3/8" galvanized flat washers for use with 3/8" 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 3/8" galvanized or zinc‑plated bolts, lag screws, and machine screws.