Selectron 7.5x80 Buldeks Screw (150 Pieces)

Selectron 7.5×80 Concrete Screw — 150 Pieces

The Selectron 7.5×80 mm Concrete Screw is a special‑threaded fastener designed for direct installation without wall plugs into hard substrates such as concrete, aerated concrete, brick, and natural stone. As it enters the pilot hole, it forms its own thread to create a monolithic bond with the base material — eliminating both plug cost and extended installation time. Featuring a T30 Torx drive and zinc coating, it delivers reliable performance for securing PVC‑aluminium frames, timber casings, heavy‑duty shelving, and equipment. The 150‑piece box offers an economical, stock‑friendly quantity for tradespeople, construction crews, and suppliers.

Technical Specifications

• Brand: Selectron
• Type: Concrete Screw / Plug‑Free Masonry Fastener
• Diameter: 7.5 mm
• Overall Length: 80 mm
• Head Style: Countersunk — T30 Torx (Star)
• Point Style: Sharp Point
• Thread Profile: Sharp, Custom Design — self‑tapping geometry with integrated debris‑clearance channels to prevent jamming
• Material: Hardened and Tempered High‑Carbon Steel
• Coating: Electro‑Galvanised Zinc — corrosion resistant
• Recommended Pilot Hole: Concrete/Solid Brick: 6 mm | Aerated Concrete: 5 mm
• Compatible Substrates: Concrete, Aerated Concrete, Solid Brick, Hollow Brick, Natural Stone
• Compatible Fixtures: PVC, Aluminium, Timber, Steel Sections
• Packaging: 150 Pieces per Box

Applications

• Fixing PVC and aluminium window and door frames to concrete walls
• Anchoring timber frames, beams, and structures to concrete floors and walls
• Mounting wall cabinets, heavy‑duty shelving, brackets, and support systems
• Securing electrical panels, plumbing components, air‑conditioning, and ventilation units
• Fastening exterior cladding, panels, and curtain‑wall systems
• Anchoring suspended ceilings, partition walls, and steel framework bases
• Fast, clean, and high‑strength fixing in renovation and refurbishment projects
• Prefabricated building, residential, and commercial fit‑out installations

Product Advantages

• Plug‑Free Installation: No separate wall plug required — lowers material cost and shortens labour time
• Self‑Tapping Thread: Forms its own thread within the pilot hole; debris channels prevent binding and ensure full seating
• T30 Torx Drive: Positive bit engagement eliminates cam‑out and slippage; enables reliable high‑torque driving for faster installation
• Zinc Coating: Long‑term corrosion resistance for indoor and sheltered outdoor environments
• Hardened Steel: Resists bending and breaking during installation; delivers deep, consistent holding power
• 80 mm Length: Ideal for thick frame sections and connections requiring deeper embedment
• Removable and Reusable: Not a permanent, irreversible anchor — can be unscrewed and re‑fastened as needed
• 150‑Piece Box: Convenient supply for medium‑ and large‑scale projects; competitive unit pricing for cost‑effective use

Installation Guidelines

• Drill a 6 mm pilot hole in concrete or brick; make the hole approx. 5 mm deeper than the screw’s intended embedment length
• Remove all dust from the hole — residual debris will prevent tight seating
• Drive the screw at a true right angle to the surface; angled installation weakens thread engagement and may break the screw
• Use a T30 Torx driver bit with a torque‑controlled screwdriver; do not over‑tighten
• Reduce pilot hole diameter to 5 mm for aerated concrete — softer blockwork requires a smaller starting hole
• Apply reduced torque in hollow brick or lightweight masonry; internal webs may fracture under excessive force
• Select stainless steel versions for consistently damp, wet, coastal, or fully exposed outdoor environments
• For high‑load‑critical projects, determine fastener count and spacing based on structural calculations

Frequently Asked Questions

Does this screw replace wall plugs entirely?
Yes — its custom thread design cuts its own secure grip directly into the prepared pilot hole; no separate plug is needed.

What size pilot hole should I drill?
6 mm diameter for concrete and solid brick; 5 mm for aerated concrete.

Can it be used in timber and PVC?
Yes — window and door frame installation is among its most common applications.

Will it rust?
Zinc electro‑plating is sufficient for indoor and sheltered outdoor use; choose the stainless steel variant for permanent water exposure.

How many screws should I use?
Standard frame installation: two screws at each corner, spaced 300–400 mm along intermediate runs; adjust according to project requirements.