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Black Plastidome Screw Caps To Suit No 6 & 8 (Bag of 100)
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Black Plastidome Screw Caps To Suit No 6 & 8 (Bag of 100)
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Delivery Information
| Delivery Time Frame | Delivery Information |
| Next Working Day By 1PM | When an order is placed by 3pm for next working day on certain items |
| Standard Delivery | Usually delivered in 2 to 4 working days |
| Delivery Charges | |
| UK Mainland | Prices start at £3.95 for very small items, £6.50 for small, £9.50 for medium and £20 for large/long items |
| Scottish Highlands & Islands, Northern Ireland & Ireland | Prices from £30, please see our delivery page for more info. |
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£14.40
Incl. VAT
£12.00
Excl. VAT
Incl. VAT
Excl. VAT
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Description
Professional Concealment and Surface Protection for Everyday Fasteners
Exposed screw heads can quickly compromise the appearance of high-quality joinery, signage, and hardware installations. Beyond the visual drawback of bare metal sitting against dark backgrounds, unshielded fixings are routinely subjected to moisture, surface abrasion, and airborne dirt. Over time, these environmental factors cause corrosion, rounded recesses, and unsightly staining on adjacent panels. Standard countersunk and pan-head screws simply lack the integral detailing required to leave a clean, finished appearance across modern decorative applications.
The Black Plastidome Screw Caps To Suit No 6 & 8 (Bag of 100) resolve this issue by offering a reliable two-piece closure system. Engineered with a dedicated base collar and a precision snap-on dome, these components securely encase the fastener head rather than relying on weak push-in friction plugs. The result is a smooth, high-gloss profile that shields steel fixings from tarnishing while creating an uninterrupted, tidy visual line across panels, furniture, and wall plates.
Supplied in trade-ready bags of one hundred, these two-piece sets provide dependable repeatability for multi-point installations. Whether you are assembling bespoke retail displays, fitting kitchen cabinetry, or fixing external perimeter signs, they ensure that every single screw head remains securely sealed away from dirt and accidental snagging.
Step-by-Step Installation Pipeline
Stage 1: Collar Positioning and Screw Selection
Begin by threading your fastener through the centre hole of the plastic retaining washer. Ensure you select a compatible wood or self-tapping screw within imperial gauge size 6 to 8, which corresponds to an outer thread diameter of 3.5 mm to 4.2 mm. The washer must be positioned with its cupped lip facing outward toward the driver to correctly receive the snap-fit dome.
Stage 2: Fastening to the Substrate
Drive the screw firmly into your mounting timber, masonry plug, or metal frame until the underside of the head seats snugly against the base washer. Take care to drive the fixing straight and avoid excessive torque, which can distort the plastic collar. The screw head must sit flush inside the internal recess of the washer so the outer perimeter remains undistorted.
Stage 3: Cap Alignment and Engagement
Align the gloss black dome cap directly over the installed retaining washer. Make sure the cap is held square to the mounting face so the internal snapping rim can engage evenly around the washer perimeter. This clean orientation ensures the cap will not buckle, crack, or twist as manual pressure is applied to the assembly.
Stage 4: Positive Snap Closure and Inspection
Press firmly on the centre of the dome cap with your thumb until you feel and hear a definite click. Run your finger along the rim to confirm the cap is sealed tight against the base plate on all sides. This positive lock keeps the fastener completely enclosed, secure against vibration, and protected from regular surface cleaning.
Key Practical Benefits for Joinery and Shopfitting
- Secure Mechanical Hold. Unlike single-piece caps that rely on thin cross-head pins pushed into screw drive slots, the Plastidome two-piece system anchors its outer cap around a permanent structural washer. This prevents covers from working loose or falling off due to vibration.
- Protection Against Environmental Wear. Completely sealing the screw head prevents moisture and cleaning chemicals from reaching the drive slot. This helps stop rust formation and keeps fastener recesses clean if maintenance access is needed later.
- High-Gloss Professional Appearance. The smooth black gloss finish blends naturally with dark substrates, powder-coated brackets, vehicle conversions, electrical trunking, and retail fixtures without drawing unwanted attention.
- Substrate Surface Cushioning. The flexible base collar acts as a mild buffer between the hard underside of the screw head and delicate surfaces, helping to reduce the risk of cracking acrylic signage or splintering veneered sheet materials.
- Broad Hardware Compatibility. Sized specifically for standard imperial gauge numbers 6 and 8, these caps accommodate metric screw shank diameters from 3.5 mm up to 4.2 mm, making them an adaptable fitting for everyday trade toolboxes.
Technical Specifications
| Specification | Rating or Standard | Practical Details |
|---|---|---|
| Product Construction | Two-Piece Assembly | Comprises a dedicated base retaining washer and a clip-on dome cap |
| Screw Gauge Fit (Imperial) | No 6 to No 8 | Engineered for traditional UK trade wood and multipurpose screws |
| Screw Shank Diameter (Metric) | 3.5 mm to 4.2 mm | Fits standard metric fasteners with countersunk or pan styles |
| Colour and Sheen | Black Gloss | Provides a deep lustrous finish suited to interior and exterior fixings |
| Pack Quantity | 100 Complete Units | Includes 100 base washers alongside 100 matching dome caps |
| Material Performance | Durable Thermoplastic | Resistant to atmospheric moisture, mild detergents, and UV discolouration |
Common Applications Across Commercial and Domestic Trades
The versatile sizing of the Black Plastidome Screw Caps To Suit No 6 & 8 (Bag of 100) makes them a staple fixing accessory across varied installation trades. Shopfitters frequently rely on them to hang printed acrylic panels, display cases, and point-of-sale boards where unsightly fastener heads would detract from brand presentation. By encasing the fastener inside a neat glossy shell, the fixings blend into graphic schemes while maintaining firm clamping force.
In commercial vehicle outfitting and camper van conversions, these caps serve both an aesthetic and functional role. The internal washer cushions vibrations that could otherwise back the fastener out or damage decorative lining fabrics over time. The rounded cap edge also eliminates sharp burrs on exposed screw heads, protecting passengers, tools, and clothing from catching on internal framework fixings.
They are equally valuable for everyday interior joinery projects, including bathroom panels, black hardware ironmongery, electrical mounting boxes, and bespoke furniture builds. In spaces where regular cleaning takes place, the sealed cap prevents aggressive detergents and wipe-down cloths from depositing moisture around the fastener, helping your hardware installations look sharp for years to come.
Need Advice on Choosing the Right Screw Caps?
If you are unsure whether this screw cap size matches your specific fixings, panel thicknesses, or architectural fittings, our experienced ironmongery specialists are here to guide you with clear, practical advice.
Contact Our Team TodaySpecification
| Finish | Black |
|---|