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Exposed bolt ends and open studs are a constant hazard in workshops, machinery, and electrical panels — snagging clothing, causing cuts, and inviting corrosion. These silicone end blanking protective covers slip over any exposed metric thread and seal it off instantly, with no tools required.
Made from 100% elastic silicone, each cap stretches to grip threads from M0.5 (0.02 in) up to M56 (2.2 in) in diameter, with heights typically ranging from 5 mm to 70 mm (0.2–2.75 in). The closed round tip fully encloses the bolt end, while the open base slides on and off by hand.
Rated for continuous use up to 280°C (536°F), these silicone screw caps are trusted for covering motor studs, heater terminals, furniture assembly bolts, and live electrical lugs in control cabinets — anywhere a bare thread needs to be made safe and clean.
Cap off exposed studs on motors, pumps, and conveyor frames to prevent snagging, corrosion, and accidental contact during maintenance cycles.
Cover unused terminal studs and live lug ends in control cabinets and junction boxes — a quick, code-friendly way to insulate exposed conductors.
Protect bolt ends on flat-pack furniture, shelving units, and metal frames from scratching floors, walls, or users after final assembly.
Keep a mixed pack on hand for RC builds, 3D printer frames, workbench fixtures, and any project where a bare thread needs a clean, safe finish.
| Material | 100% Elastic Silicone (non-toxic) |
|---|---|
| Color | White |
| Thread Size Range | M0.5 – M56 (metric) |
| Height Range | Typically 5 mm – 70 mm (0.2 – 2.75 in) — varies by size variant |
| Temperature Resistance | Up to 280°C (536°F) continuous |
| Head Style | Round, closed tip |
| Installation | Press-fit by hand, no tools required |
| System of Measurement | Metric |
| Reusability | Yes — washable and reusable |
| Quantity Options | See variant options |
Match the cap size to the nominal thread diameter of your bolt. An M6 bolt uses an M6 cap. The silicone stretches slightly, so a cap can typically accommodate threads up to about 0.5 mm larger in diameter — but for the best grip, match exactly or go one size smaller.
Yes. The silicone is rated for continuous exposure up to 280°C (536°F). It won't melt, drip, or become brittle at typical industrial or automotive surface temperatures. For brief spikes above 300°C, test in a non-critical area first.
Yes — silicone is an excellent dielectric insulator. These caps are commonly used to cover unused terminal studs, live wire ends, and grounding lugs in control cabinets and junction boxes. Ensure the cap fully encloses the conductive part and is not forced over sharp edges that could cut the silicone.
Yes — pull them off, wash with mild soap and water, let dry, and push back on. Silicone resists UV degradation and most common solvents. Avoid prolonged immersion in strong acids or fuels. Most customers reuse the same set across multiple projects.
This listing is for white caps. Other colors (black, red, blue, yellow, green) are generally available for sizes M3 through M20. Contact us with your size and color requirements and we will check availability.
The elastic silicone grips the thread and generally stays in place under moderate vibration. For high-vibration environments, choose a cap that is slightly undersized relative to the thread diameter for a tighter stretch fit. A small drop of silicone-based lubricant on the inside can help seat the cap more deeply without reducing grip.
The second number is the internal height of the cap — how deep the bolt end can protrude into the cap. Choose a height that is at least as long as the exposed thread length you need to cover. When in doubt, go longer; excess cap length simply folds or compresses against the surface.
Yes. Silicone is UV-stable and weather-resistant. These caps perform well in outdoor environments including garden furniture, fencing hardware, and exterior electrical enclosures. They will not crack or harden from sun exposure under typical outdoor conditions.
