When your project demands long-lasting, high-strength fasteners, the Hillman 5/8 in. D x 4-1/2 in. L Heat-Treated Zinc Steel Hex Head Cap Screw is ready to perform. This 25-pack boxed set brings confidence to a range of applications—from heavy-duty shelving and deck framing to equipment mounting and metal-to-wood assemblies—delivering dependable performance where it matters most.
Why this hex head cap screw stands out
Designed for strength and durability, this Hillman fastener combines a 5/8 inch diameter with a generous 4-1/2 inch length, giving you a sturdy, deep bite in a variety of materials. The heat-treated zinc finish provides excellent corrosion resistance, helping your assemblies withstand humidity, indoor/outdoor use, and everyday wear without compromising appearance. Built from solid steel and rated as Grade 5, these screws strike a practical balance between strength and workability for most common structural and fixture projects.
Key benefits
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High-strength performance: Grade 5 steel delivers reliable shear and tensile strength for demanding fastenings.
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Corrosion resistance: Heat-treated zinc coating guards against rust and staining, expanding the life of outdoor or high-humidity installations.
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Easy driving with a hex head: The hex head accepts standard wrenches or drivers for precise torque control and quick installation, even in tight spaces.
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Long reach for versatile mounting: At 4-1/2 inches, this screw is ideal for deeper holes, thick materials, or assemblies where a longer fastener is essential.
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Convenient 25-pack boxed packaging: Keeps your workshop stocked and reduces downtime on larger projects.
Perfect use cases
- Deck framing, railing connections, and other outdoor wood-to-wood or wood-to-metal assemblies where a robust fastener is required.
- Shelving systems, cabinetry supports, and heavy-duty mounts where a strong, long screw helps secure fixtures.
- Machinery brackets, agricultural equipment, and shop fixtures that benefit from a durable, high-strength connection.
- Any project needing a reliable, easy-to-drive screw with good bite into softer metals or seasoned wood.
Practical installation tips
- Use with a matching hex driver or socket wrench to achieve consistent torque and prevent cam-out.
- For wood applications, pre-drill a pilot hole to minimize splitting and ensure accurate positioning.
- Apply a light lubricant or anti-seize compound if driving into hard materials to reduce friction and ease installation.
- Pair with a washer when a load-distributing surface is needed or when mounting hardware requires even pressure.
Specifications at a glance
- 5/8 in
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Length: 4-1/2 in
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Finish: Heat-treated zinc
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Material: Steel
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Head type: Hex
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Thread type: Coarse
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Grade: 5
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Package contents: 25 pieces
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Packaging: Boxed
Whether you’re outfitting a new workbench, repairing outdoor structures, or assembling equipment mounts, this Hillman hex head cap screw delivers consistent performance and dependable strength. It’s a practical, purpose-built fastener for professionals and DIY enthusiasts who want a trusted, long-lasting solution that’s ready to tackle the job right out of the box.
