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Exposed screw heads on metal roofing, fencing, and decking are a rust magnet. These snap-on plastic caps are engineered specifically for 5.2mm across-flats hex head self-drilling screws, creating a tight moisture barrier that keeps rain, snow, and UV off your fasteners — no tools, no adhesive, no hassle.
Each cap is molded from UV-stabilized plastic that stays flexible from -20°C to +80°C (-4°F to 176°F). Available in White, Sea Blue, Ivory White, and Silver Gray to match your roofing panels or exterior finish. Sold in packs of 10 to 500 pcs to suit small repairs or large installations.
Use them on metal roofing screws, gutter guard fasteners, outdoor electrical box covers, RV accessories, sign mounting hardware, and any exterior hex head bolt where corrosion protection matters.
Seal every exposed self-drilling roofing screw head to prevent water infiltration and extend the life of your roof panels.
Protect fence posts, deck hardware, and outdoor furniture fasteners from rust without any special tools or skills.
Cover exterior hex head screws on RV panels, boat accessories, and dock hardware exposed to moisture and salt air.
Bulk packs of up to 500 pcs make it easy to cap every fastener on large commercial or residential exterior projects.
| Product Type | Snap-on waterproof hex head screw cap |
|---|---|
| Hex Size (Across Flats) | 5.2mm (metric) |
| Material | UV-stabilized weather-resistant plastic |
| Color Options | White, Sea Blue, Ivory White, Silver Gray |
| Installation | Push-on / snap-fit, no tools required |
| Temperature Range | -20°C to +80°C (-4°F to 176°F) |
| Pack Sizes | 10, 20, 50, 100, 200, 500 pcs |
| Compatible Fasteners | 5.2mm hex head self-drilling screws, lag bolts, hex washer head screws |
| Applications | Metal roofing, fencing, decking, outdoor electrical, RV, marine, sign mounting |
Yes — as long as the screw or bolt has a standard 5.2mm hex head (across flats), the cap will fit. This includes self-drilling screws, standard hex head bolts, and hex washer head screws. Measure your hex head width before ordering to confirm compatibility.
They provide a strong water seal against rain, splashing, and hose spray. The snap fit creates a physical barrier around the hex head. They are not designed for submerged applications. For maximum protection in driving rain or coastal environments, a small dab of silicone sealant inside the cap is recommended.
Rated from approximately -20°C to +80°C (-4°F to 176°F). The plastic stays flexible in cold weather and resists softening under typical summer heat. For extreme high-temperature environments such as engine compartments, silicone caps would be more appropriate.
Generally yes. The snap fit may loosen slightly after repeated removals, but for occasional seasonal access they can typically be reused several times. For permanent sealing applications, replacing with new caps after removal is recommended.
No — these are precisely molded for 5.2mm across flats. A 5.5mm hex head will be too large and may split or not seat the cap properly. Please measure your hex head carefully before ordering.
Pricing varies by quantity pack size selected. Color choice (White, Sea Blue, Ivory White, Silver Gray) does not affect the price within the same quantity tier. Select your preferred color and pack size above.
No tools required. Simply align the cap opening over the hex head and press down firmly by hand until it seats flush. The snap-fit design holds the cap securely in place without adhesive.
