Meridyen Self-Drilling Screw YHB 4.2X16 (18,000 Pieces)

Meridyen Self-Drilling Screw YHB 4.2×16 mm — 18,000 Pieces

The Meridyen Self-Drilling Screw YHB 4.2×16 mm is a fastener designed to deliver both quick and stronger grip without pre-drilling in medium-gauge sheet metal, metal profiles, and single-layer insulated applications. Its 4.2 mm diameter provides a wider engagement surface compared to the 3.9 mm series, while the 16 mm length ensures sufficient depth in layered builds. The YHB wide-bearing head design distributes pressure evenly to prevent crushing the sheet and offers partial sealing protection. Supplied in a large pack of 18,000 pieces, it enables uninterrupted work in mass production, construction sites, and large-scale assembly projects.

Technical Specifications

• Brand: Meridyen
• Diameter × Length: 4.2 mm outer diameter, 16 mm working length beneath the head
• Head Type: YHB — wide bearing surface, washer-effect hexagonal flange head
• Thread Profile: Metal-specific thread pitch; the 4.2 mm diameter creates a more robust shank and broader thread surface for vibration-resistant hold
• Point Feature: Self-drilling tip; forms its own pilot hole, no pre-drilling required
• Drive Type: Easily applied with standard hexagonal wrenches
• Surface Coating: Galvanized; corrosion-resistant, suitable for indoor and outdoor use
• Pack Contents: 18,000 pieces

Applications

• Fastening medium-gauge sheet metal panels and profiles together
• Roof and facade cladding: sheet + thin insulation layer installation
• Suspended ceilings, metal framing and support system connections
• Securing air-conditioning, ventilation duct and pipe support brackets
• Metal doors, frames, fences and medium-duty railing structures
• Manufacturing of electrical panels, white goods and machinery equipment
• Interior partition systems and thick-profile fixture installations

Product Advantages

• No Pre-Drilling Required: Self-drilling tip penetrates sheet metal directly; noticeably reduces installation time and labour cost
• Stronger, More Secure Grip: The 4.2 mm diameter forms a wider thread surface than the 3.9 mm series; provides more reliable hold in the same application with lower risk of loosening under load and vibration
• Ideal Length for Layered Builds: 16 mm working length penetrates deep enough into the support profile even in dual-layer assemblies such as sheet + insulation; the right solution where the 13 mm size falls short
• Wide Bearing Surface: YHB head spreads pressure over a large area; thin metals resist crushing and tearing, the washer-effect assists sealing
• Economical Bulk Pack: 18,000 pieces — ensures continuous stock for mass production and large sites while lowering unit cost
• Smooth High-Speed Installation: Works flawlessly with electric screwdrivers; the guiding tip maintains alignment and does not drift off-axis
• Long-Lasting Protection: Galvanized coating provides durable defence against moisture, rain and outdoor conditions

Installation Recommendations

• Position the screw perfectly perpendicular to the sheet surface; angled entry accelerates tip wear and reduces holding strength
• Best suited to total assembly thicknesses of 3–7 mm; ensure adequate thread protrusion through the far side
• Do not over-tighten; stop when the head seats fully to avoid buckling the sheet
• Place a gasket between dissimilar metals; direct contact may cause galvanic corrosion
• Store in dry, well-ventilated conditions; sustained damp exposure shortens coating life

Frequently Asked Questions

What does 4.2×16 mm mean and which thicknesses is it best suited for?
4.2 mm is the outer shank diameter; 16 mm is the effective length measured from beneath the head. It is ideal for medium-gauge sheet, insulated facade and profile assemblies with a total connection thickness of 3–7 mm.

What is the advantage of the 4.2 mm diameter?
The wider outer diameter compared to 3.9 mm enables deeper, tighter thread engagement in the material; forms a stronger connection that is less likely to loosen under vibration and wind load.

How does the 16 mm length differ from 13 mm?
The extra length reaches sufficient depth in the support profile even in layered builds such as sheet + insulation; grip strength does not drop off in thicker assemblies and sag does not occur.