Introducing the Hillman No. 1/4-20 x 4 in. Phillips Flat Head Zinc-Plated Steel Machine Screws (100 pk) — a dependable, bulk-fastener solution designed for durable, flush-mounted assemblies in metal projects. Built for real-world use, these screws stand up to the demands of indoor and outdoor environments while delivering a clean, professional finish.
Featuring a No. 1/4-20 coarse thread and a 4-inch length, these machine screws bite securely into tapped holes or with a supporting nut, making them ideal for mounting brackets, equipment racks, electrical panels, and structural joints. The zinc-plated finish provides corrosion resistance, so you can rely on these screws in environments exposed to moisture or rapid temperature changes without sacrificing performance.
Key features
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Diameter & thread: No. 1/4-20 coarse thread for compatibility with standard nuts and tapped holes.
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Length: 4 inches, suitable for multi-material assemblies and through-holes with ample bite.
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Head style: Flat head creates a low-profile, flush surface once installed.
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Finish: Zinc-plated steel for indoor and outdoor use, delivering reliable corrosion protection.
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Drive: Phillips drive for wide tool compatibility; driver bit not included.
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Quantity: 100-count box, ready to stock your shop for ongoing projects.
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Self-drilling/self-tapping: Not self-drilling or self-tapping; requires a pre-tapped hole or nut.
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Material: Hardened steel built to endure repeated mounting and disassembly.
Practical applications
Ideal for securing heavy brackets to metal frames, mounting equipment housings, anchors in machinery, or attaching components to threaded panels. Use with nuts or pre-tapped holes to achieve a strong, vibration-resistant joint. The 4-inch length provides flexibility for thicker materials or multiple mounting points, while the flat head offers a clean aesthetic on finished surfaces.
Who benefits most
This 100-pack is perfect for contractors, shop technicians, and DIY enthusiasts who frequently assemble metal structures or replace worn fasteners. It’s particularly well-suited for projects where a rust-resistant, long-lasting fastener is essential, and where a flush, professional look matters.
Tips for best results
- Pair with standard 1/4-20 nuts or a compatible tapped hole for a secure connection.
- Ensure you have the correct Phillips driver and the appropriate pre-tapped hole or nut before installation.
- Store in a dry, organized container to maintain the zinc finish and simplify future replacements.
