Meridyen Drill-Point Screw YHB 3.9X19 (18,000 Pieces)

Meridyen Self-Drilling Screw YHB 3.9×19 mm — 18,000 Pieces

The Meridyen Self-Drilling Screw YHB 3.9×19 mm is a fastener engineered for strong, rapid installation in medium‑gauge sheet metal, metal profiles and insulated structural assemblies without pre‑drilling. The YHB wide‑bearing head design distributes pressure evenly to prevent crushing the sheet and provides partial sealing protection. Supplied in a large pack of 18,000 pieces, it enables uninterrupted work in serial production, on‑site projects and continuous assembly operations.

Technical Specifications

• Brand: Meridyen
• Diameter × Length: 3.9 mm outer diameter, 19 mm working length beneath the head
• Head Type: YHB — wide bearing surface, washer‑effect hexagonal flange head
• Thread Profile: Metal‑specific thread pitch; reliable grip and balanced advance
• Point Feature: Self‑drilling tip; forms its own pilot hole, no pre‑drilling required
• Drive Type: Works easily with standard hexagonal wrenches
• Surface Coating: Galvanized; corrosion‑resistant, suitable for indoor and outdoor use
• Pack Contents: 18,000 pieces

Applications

• Single and double‑layer assemblies of medium‑gauge sheet metal panels
• Roof and facade cladding: sheet + insulation + support profile installation
• Suspended ceilings, support systems and lightweight metal frame connections
• Securing air‑conditioning, ventilation duct and pipe support brackets
• Metal doors, frames, fences and 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; significantly reduces installation time and labour cost
• Wide Bearing Surface: YHB head spreads load over a large area; thin metals resist crushing and tearing, the integrated washer profile enhances sealing
• Extended Length: 19 mm working length delivers sufficient grip depth even through sheet + insulation layers; better suited to thicker assemblies than the 13 mm and 16 mm sizes
• Fast High‑Volume Installation: Operates at high speed with electric screwdrivers; 18,000‑piece bulk pack ensures continuous production
• Reliable Hold: Metal‑optimised thread design resists loosening under vibration and wind load; connections remain secure
• Cost‑Effective Bulk Pack: High‑quantity packaging lowers unit price; reduces reorder frequency and simplifies procurement
• Long‑Lasting Protection: Galvanized coating provides durable resistance 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
• Ideal for total assembly thicknesses of 5–10 mm; confirm 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 environments; prolonged damp exposure shortens coating life

Frequently Asked Questions

What does 3.9×19 mm mean and which thicknesses is it suitable for?
3.9 mm is the outer shank diameter; 19 mm is the effective length measured from beneath the head. It is ideal for sheet, insulated and multi‑layer metal assemblies with a total thickness of 5–10 mm.

How does the 19 mm length differ from the 13 mm and 16 mm versions?
The extra length ensures sufficient penetration into the support profile even in layered builds such as sheet plus insulation; grip strength does not drop as thickness increases and connections remain free from sagging.

What is the function of the YHB head design?
The flared head distributes pressure evenly; prevents tearing of the sheet, partially blocks rain and moisture from entering the joint, and maintains a permanent, neat appearance.