Meridyen Self-Drilling Screw YHB 3,9X22 (12,000 Pieces)

Meridyen Self-Drilling Screw YHB 3.9×22 mm — 12,000 Pieces

The Meridyen Self-Drilling Screw YHB 3.9×22 mm is a fastener that delivers deep, reliable grip in medium‑gauge sheet metal, double‑layer metal assemblies and insulated facade‑roof systems without the need for pre‑drilling. 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 for both continuously‑producing workshops and large construction sites.

Technical Specifications

• Brand: Meridyen
• Diameter × Length: 3.9 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 pitch; deep thread form delivers firm hold even through thick layers
• 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 frames, suspended ceilings and support system connections
• Securing air‑conditioning, ventilation duct and pipe support brackets
• Metal doors, frames, fences and railing structures
• Mounting electrical panels, machinery housings and thick components on 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
• Wide Bearing Surface: YHB head spreads force over a large area; thin metals resist crushing and tearing, washer profile assists sealing
• Extended Length: 22 mm working length penetrates deep into the support structure even through layered builds such as sheet + insulation + sheet; ideal where 19 mm and shorter lengths fall short
• Well‑Proportioned Pack: 12,000 pieces — long‑lasting supply without excessive storage demand; straightforward procurement and handling
• Reliable Hold: Metal‑optimised thread design resists loosening under vibration and wind load; connections remain secure for years
• Fast High‑Volume Installation: Runs at high speed with electric screwdrivers; progress stays efficient even on large projects
• 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 increases tip wear and reduces holding strength
• Best suited to total assembly thicknesses of 7–13 mm; ensure sufficient thread protrusion through the far side
• Do not over‑tighten; stop when the head seats fully to prevent 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 3.9×22 mm mean and which thicknesses is it best suited for?
3.9 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 thickness of 7–13 mm.

How does the 22 mm length compare to shorter sizes?
The extra length ensures deep engagement in the support profile even in layered builds such as single sheet plus insulation; grip strength does not fall off as thickness increases, joints remain sag‑free and tight over time.

What advantage does the YHB head provide?
The flared head distributes pressure evenly; prevents tearing of the sheet, partially blocks rain and moisture ingress, and delivers a clean, permanent finish.