Screw caps and hole cover plugs give every fastener a clean, finished look — whether you're assembling flat-pack furniture, mounting a mirror, or tidying up exposed bolt ends on a workbench. At HomeDIYer, we stock a wide range of screw caps in plastic, silicone, stainless steel, and brass so you can match the right cover to the right job without hunting across multiple suppliers.
Push-fit caps are the go-to solution for covering pre-drilled holes in flat-pack and custom furniture. Available in diameters from 5mm to 40mm, these polypropylene plugs press firmly into the hole and hold without adhesive or tools. They're stocked in white, black, and brown to blend with the most common furniture finishes. Use them on cabinet sides, shelf pin holes, and any surface where a clean, seamless look matters. Multi-color packs let you keep a variety on hand for different projects without ordering separately each time.
Snap-on caps clip directly over a driven screw head, making them ideal for visible screws in trim, paneling, and cabinetry. Our snap-on range covers 7mm–8mm Phillips and flat head screws and comes in 19 colors — from standard white and black to wood-tone beige and bold accent colors. The hinged fold-over design on select models allows you to drive the screw first, then fold the cap closed for a flush finish. No pre-drilling required; the cap simply clicks into place over the head.
Mirror screw caps combine function and style for glass, acrylic, and mirror installations. Polished stainless steel and chrome-plated brass disc caps thread onto the screw shaft after the panel is secured, covering the head with a reflective, jewelry-grade finish. Available in flat and dome profiles from 10mm to 50mm, and in silver, gold, black, and rose gold. These caps are a standard choice for bathroom mirrors, retail display panels, and architectural glass features where exposed hardware needs to look intentional rather than industrial.
Plastic hexagonal bolt caps slip over hex head bolts and nuts to protect threads from corrosion, paint overspray, and mechanical damage during storage or installation. Made from PE plastic, they're available for bolt sizes M4 through M24 and come in packs of 5 to 100. Common applications include automotive assembly, structural steel connections, outdoor equipment, and any environment where exposed threads need to stay clean and undamaged until final torquing. The nylon hex nut cover set also provides electrical insulation for low-voltage applications.
Silicone end caps and rubber blanking plugs handle conditions that plastic can't. Our silicone sleeve caps are rated to 280°C and cover screw sizes from M0.5 to M56, making them suitable for powder coating masking, welding protection, and high-heat industrial environments. Round rubber button caps in 9mm, 10mm, and 11mm provide a waterproof seal for blanking unused holes in enclosures, panels, and outdoor equipment. The elastic fit ensures a snug grip without adhesive, and the caps can be removed and reused multiple times.
Cap nuts — also called acorn nuts or dome nuts — thread onto bolt ends to cover exposed threads while adding a polished, finished appearance. Our brass cap nuts run from M3 to M20 in a natural untreated finish that develops a warm patina over time, ideal for lamp assemblies, furniture hardware, and decorative metalwork. Stainless steel acorn nuts in 304 grade cover M3 to M12 and resist rust in damp or outdoor environments. Brass ball cap nuts with female threads from M3 to M12 serve as lamp finials and decorative fastener terminals in lighting and display fixtures.
| Cap Type | Material | Size Range | Best Use | Installation | Finish Options |
|---|---|---|---|---|---|
| Push-Fit Hole Plug | Polypropylene (PP) | 5mm – 40mm hole dia. | Furniture, cabinetry, shelf holes | Press-fit, no tools | White, Black, Brown |
| Snap-On Screw Cap | Plastic (PP/ABS) | 7mm – 8mm screw head | Trim, paneling, visible screws | Snap over driven screw | 19 colors available |
| Mirror Screw Cap | Stainless Steel / Brass | 10mm – 50mm disc dia. | Glass, mirrors, architectural panels | Thread onto screw shaft | Silver, Gold, Black, Rose Gold |
| Hex Bolt Protection Cap | PE Plastic / Nylon | M4 – M24 | Industrial, automotive, structural | Slip over bolt/nut head | Black, White |
| Silicone Sleeve Cap | Silicone Rubber | M0.5 – M56 | High-temp masking, waterproofing | Stretch over screw end | White |
| Cap Nut (Acorn Nut) | Brass / 304 Stainless | M3 – M20 | Decorative assemblies, lamp hardware | Thread onto bolt end | Natural Brass, Stainless |
Run through this quick checklist each season to keep your screw caps performing and looking their best:
Screw caps cover exposed screw heads and bolt ends to protect against corrosion, prevent injury from sharp edges, and improve the finished appearance of furniture, cabinetry, and hardware installations.
Measure the outer diameter of the screw head or the hole diameter you need to cover. Push-fit caps are sized by hole diameter (e.g., 5mm–40mm), while snap-on caps are sized by screw head diameter. Always check the product listing for the compatible screw size range.
Push-fit caps press directly into a pre-drilled hole and grip the sides of the hole. Snap-on caps clip over the screw head after the screw is driven in. Push-fit caps are ideal for covering unused holes; snap-on caps work best for concealing driven screws in visible surfaces.
Standard plastic caps (PP or PE) handle light outdoor exposure but may fade or become brittle in prolonged UV conditions. For outdoor or marine applications, choose stainless steel dome caps or UV-stabilized nylon caps rated for exterior use.
Yes. Decorative mirror screw caps — typically polished stainless steel or chrome-plated brass — are specifically designed for glass and mirror mounting. They thread onto the screw shaft after the glass is secured, covering the screw head with a polished disc for a clean, professional look.
Common materials include polypropylene (PP) plastic, nylon (PA66), silicone rubber, stainless steel (304/316), brass, and chrome-plated zinc. Plastic caps are lightweight and economical; metal caps offer superior durability and a premium finish.
Clean the surface around the screw hole with isopropyl alcohol and let it dry completely. Peel the backing from the adhesive cap and press it firmly over the hole for 10–15 seconds. Avoid applying in temperatures below 50°F (10°C) for best adhesion.
A cap nut (also called an acorn nut or dome nut) threads onto a bolt or stud to cover the exposed thread end, providing both a fastening function and a finished appearance. A screw cap, by contrast, is a non-structural cover that snaps or pushes over an already-driven screw head purely for aesthetics or protection.
Insert a thin flathead screwdriver or a plastic pry tool at the edge of the cap and gently lever it upward. Avoid metal tools on finished wood surfaces to prevent scratching. For adhesive caps, apply a small amount of isopropyl alcohol around the edge to soften the adhesive before prying.
Yes. HomeDIYer offers free standard shipping on qualifying orders. Check the current free shipping threshold at checkout. Most screw cap orders ship within 1–3 business days from our US fulfillment centers.
