Meridyen Self-Drilling Screw YHB 4.2X22 (12,000 Pieces)

Meridyen Self-Drilling Screw YHB 4.2×22 mm — 12,000 Pieces

The Meridyen Self-Drilling Screw YHB 4.2×22 mm is a fastener that delivers deep, reliable grip without pre-drilling in medium-gauge sheet metal, insulated roof and facade systems, and double-layer metal assemblies. Its 4.2 mm diameter offers a wider engagement surface, while the 22 mm length reaches sufficient depth into the support structure in layered applications. The YHB wide-bearing head design distributes pressure evenly to prevent crushing the sheet and provides partial sealing protection. Supplied in a well-balanced pack of 12,000 pieces, it offers practical stock availability for both mass production and large construction sites.

Technical Specifications

• Brand: Meridyen
• Diameter × Length: 4.2 mm outer diameter, 22 mm working length beneath the head
• Head Type: YHB — wide bearing surface, washer-effect hexagonal flange head
• Thread Profile: Metal-specific thread form; 4.2 mm diameter provides a robust shank, broad thread surface, and 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: 12,000 pieces

Applications

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

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 creates a wider thread surface than the 3.9 mm series; lower risk of loosening under load and vibration
• Ideal Depth for Layered Builds: 22 mm working length penetrates sufficiently deep into the support profile even in multi-layer assemblies such as sheet + insulation + sheet; the right solution where 16 mm and shorter lengths are inadequate
• Wide Bearing Surface: YHB head spreads pressure over a large area; thin metals resist crushing and tearing, the washer-effect assists sealing
• Well-Proportioned Pack: 12,000 pieces — enables long-running work without overstocking; simplifies storage and procurement
• Smooth High-Speed Installation: Works flawlessly with electric screwdrivers; the guiding tip maintains perfect 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 7–13 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 4.2×22 mm mean and which thicknesses is it best suited for?
4.2 mm is the outer shank diameter; 22 mm is the effective length measured from beneath the head. It is ideal for double-layer sheet, insulated facade and thick-profile assemblies with a total connection thickness of 7–13 mm.

How does the 22 mm length differ from shorter sizes?
It engages deeper into the support profile than 16 mm and shorter versions; passes through thick insulation to lock securely into the main structure, connections remain sag-free and do not loosen over time.

What makes the YHB head design different?
The flared head distributes pressure evenly; prevents tearing of the sheet, partially blocks moisture and rain ingress in outdoor applications, and delivers a permanent, neat finish.