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Exposed hex bolts and nuts are a constant headache on outdoor equipment, playground fixtures, and industrial machinery — they rust, snag clothing, and create shock hazards. These hexagonal PE plastic bolt nut protection caps snap firmly over the nut profile without adhesive, sealing off moisture, dirt, and accidental contact in seconds.
Each cap features a precision hexagonal interior that matches standard metric hex nut profiles from M4 through M24 (outer dimensions typically 7×9 mm up to 36×45 mm). Made from high-density polyethylene — odorless, non-toxic, and non-conductive — they stay flexible down to -100°C (-148°F). Available in six colors: White, Black, Blue, Yellow, Gray, and Red, in pack quantities of 10, 20, 30, or 50 pieces.
Use these hex screw covers on fence hardware, automotive chassis bolts, electrical panel studs, cold-storage racking, and playground equipment. Wherever a bare bolt end needs a clean, safe finish, these metric bolt caps deliver a tool-free solution that holds firm under vibration and weather.
Cover exposed structural bolts on steel frames, fencing, and outdoor fixtures to prevent rust and eliminate snag hazards on job sites.
Protect chassis bolts, suspension hardware, and trailer hitch fasteners from road salt, moisture, and corrosion between service intervals.
Cap unused terminal studs and grounding bolts inside control panels and junction boxes to reduce accidental contact and short-circuit risk.
Finish exposed bolt ends on flat-pack furniture, playground equipment, and garden structures for a clean look and child-safe surface.
| Material | PE (High-Density Polyethylene) — odorless, non-toxic |
|---|---|
| Compatible Sizes (Metric) | M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24 |
| Cap Outer Dimensions (W × H) | M4: 7×9 mm | M5: 8×10 mm | M6: 10×14 mm | M8: 12–14×15 mm | M10: 16–17×20–22 mm | M12: 18–19×23 mm | M14: 21–22×24–27 mm | M16: 23–24×27 mm | M18: 26×32 mm | M20: 30×40 mm | M22: 32×35 mm | M24: 36×45 mm |
| Interior Profile | Hexagonal — matches standard metric hex nut flats |
| Available Colors | White, Black, Blue, Yellow, Gray, Red |
| Pack Quantities | 10, 20, 30, 50 pieces (select variant above) |
| Low Temperature Rating | Down to -100°C (-148°F) — remains flexible |
| Chemical Resistance | Good resistance to most acids and alkalis; not suitable for strong oxidizing acids |
| Electrical Insulation | Yes — non-conductive PE |
| Installation | Tool-free snap-on; removable and reusable |
| System of Measurement | Metric |
Match the cap size to the thread diameter of your bolt — an M8 bolt uses an M8 cap. The hexagonal interior is sized to fit the standard hex nut of the same metric designation. If you are unsure, measure across the flats of the nut with a caliper. For bolts without a nut (bare threaded end), the cap may not grip as firmly; we recommend installing it over a nut or hex bolt head for the best retention.
Yes. High-density PE maintains flexibility down to typically -100°C (-148°F), so these caps will not crack or become brittle in commercial cold-storage environments, outdoor winter installations, or refrigeration equipment. They are a popular choice for cold-chain racking and outdoor machinery fasteners.
The snug hexagonal fit creates a good moisture barrier against rain, humidity, and splashes, significantly slowing corrosion on outdoor hardware. For applications involving prolonged submersion or high-pressure water exposure, adding a small amount of silicone grease inside the cap before installation improves the seal further.
Yes — PE is a non-conductive material and provides supplementary insulation over exposed terminal studs, grounding lugs, and bolt heads in low-voltage control panels and junction boxes. For high-voltage applications, always follow applicable electrical codes; these caps are supplementary protection and not a primary insulator.
Absolutely. The caps snap on and pull off by hand without tools. PE is resilient and generally maintains its grip through repeated removal and reinstallation. Keep a few spares in your toolbox — they are reusable indefinitely under normal conditions as long as they are not cut or exposed to extreme heat.
Some metric bolt sizes have more than one common nut width across the flats depending on the standard (e.g., DIN 934 vs. ISO 4032). The M8 options (12×15 mm, 13×15 mm, 14×15 mm) and M10 options (16×22 mm, 17×20 mm) correspond to different nut widths used in different applications. Check the width across the flats of your specific nut to select the correct cap variant.
No — all six colors (White, Black, Blue, Yellow, Gray, Red) are made from the same high-density PE material with identical performance characteristics. Color is purely for visual identification, such as coding bolt sizes, marking safety-critical fasteners, or matching equipment color schemes.
