Meridyen Drill-Point Screw YHB 3.9X38 (8,000 Pieces)

Meridyen Self-Drilling Screw YHB 3.9×38 mm — 8,000 Pieces

The Meridyen Self-Drilling Screw YHB 3.9×38 mm is a premium‑series fastener designed for thick insulated facade and roof systems, multi‑layer metal structures, and heavy‑duty applications requiring deep grip. The YHB wide‑bearing head design distributes pressure evenly to prevent crushing the sheet and provides partial sealing protection. Supplied in a pack of 8,000 pieces, it offers balanced stock availability for large construction sites and quality‑focused manufacturing workshops.

Technical Specifications

• Brand: Meridyen
• Diameter × Length: 3.9 mm outer diameter, 38 mm working length beneath the head
• Head Type: YHB — wide bearing surface, washer‑effect hexagonal flange head
• Thread Profile: Metal‑specific deep thread form; holds firmly in every layer without slipping or loosening despite the longer shank
• 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: 8,000 pieces

Applications

• Fastening four or more layers of sheet metal panels, profiles and connection components
• Roof and facade cladding: sheet + thick insulation + support profile installation
• Thick insulated exterior facade systems, rainscreen cladding connections
• Medium‑gauge metal frames, suspended ceilings and heavy‑duty support systems
• Securing air‑conditioning, ventilation duct and thick pipe support brackets
• Manufacturing of machinery housings, thick‑component white goods and large electrical panels
• Metal doors, frames, fences and heavy railing structures

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 load over a large area; thin metals resist crushing and tearing, the washer profile enhances sealing
• Maximum Grip Depth: 38 mm working length penetrates deep into the support structure even in layered builds such as thick insulation + double‑layer sheet; ideal solution where 32 mm and shorter lengths are insufficient
• Right‑Sized Pack: 8,000 pieces — adequate volume for large projects or production without excess stock; simple storage and inventory tracking
• Reliable Hold: Metal‑optimised thread design resists loosening from vibration, wind load and temperature variation; connections remain secure for years
• Stable Alignment: Despite the longer length, the guiding tip maintains perfect axis alignment; progresses accurately even in vertical and overhead installations
• 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 18–27 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
• For hard, thick metals, pre‑drilling a pilot hole is recommended due to the longer length; reduces risk of screw breakage
• Store in dry, well‑ventilated conditions; sustained damp exposure shortens coating life

Frequently Asked Questions

What does 3.9×38 mm mean and which thicknesses is it best suited for?
3.9 mm is the outer shank diameter; 38 mm is the effective length measured from beneath the head. It is ideal for thick insulated facades, multi‑layer sheet assemblies and heavy‑duty metal connections with a total thickness of 18–27 mm.

How does the 38 mm length differ from shorter sizes?
It engages deeper into the support profile than shorter versions; passes through thick insulation to lock securely into the main structure, connections remain sag‑free, load is distributed over a wider area, and loosening does not occur 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.