Hillman’s 5/8 in. D x 5-1/2 in. L Heat Treated Zinc Steel Hex Head Cap Screw delivers dependable, heavy-duty fastening for demanding projects. This 25-pack boxed set combines strength, durability, and convenient packaging for builders, woodworkers, and fabricators who demand consistent performance from every screw.
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Diameter: 5/8 in (major diameter) for robust, high-load connections
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Length: 5-1/2 in, providing substantial engagement in thick materials
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Material & Finish: Heat-treated zinc-coated steel for improved hardness, wear resistance, and corrosion protection
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Grade: 5, a proven standard for strong, reliable fasteners in heavy-duty assemblies
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Thread Type: Coarse thread for quick, versatile engagement in a variety of components
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Head Type: Hex head designed for solid, accessible driving with common wrenches or sockets
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Quantity: 25 pieces, boxed for organized storage and ready-to-use projects
Ideal applications
Perfect for heavy-duty woodworking, equipment mounting, structural framing, and assembly tasks where a long, strong fastener is required. Use these screws to secure thick lumber, mount machinery components, or join metal brackets to wood where high clamp load is essential. The heat-treated core and zinc finish help maintain performance in indoor environments and moderate outdoor use.
What sets this apart
Unlike standard fasteners, these Hillman hex head cap screws combine heat-treated hardness with a protective zinc coating, delivering enhanced wear resistance and long-term durability. The 5/8 in. diameter paired with a 5-1/2 in. length creates a robust fastening solution that holds tight under vibration and dynamic loads, while the coarse threads offer strong bite in a range of materials without requiring precision tapping.
Practical tips for use
- Pair with compatible hex nuts and washers when threading into assemblies that require nut engagement or load distribution.
- Ensure sufficient thread engagement in mating components to achieve optimal holding power without over-tightening.
- Store the boxed 25-pack in a dry, organized space to prevent rust and keep fasteners readily accessible for future projects.
