Selectron 7.5x100 Buldex Screw (100 Pieces)

Selectron 7.5×100 Concrete Screw — 100 Pieces

The Selectron 7.5×100 mm Concrete Screw is a special‑threaded fastener designed for direct installation into hard surfaces such as concrete, brick, and aerated concrete without the need for wall plugs. As it enters the pilot hole, it cuts its own thread to form a solid, integrated connection with the base material; this eliminates both the cost of separate plugs and extended installation time. Featuring a T30 Torx drive, sharp point, and zinc coating, it delivers reliable holding power for both interior and sheltered exterior applications. Its 100 mm length provides ideal anchoring depth for securing PVC‑aluminium frames, shelves, panels, and similar fixtures to thick masonry and concrete surfaces. The 100‑piece box offers a practical, cost‑effective stock solution for tradespeople, construction crews, and wholesale suppliers.

Technical Specifications

• Brand: Selectron
• Type: Concrete Screw / Direct‑Fix Masonry Fastener
• Diameter: 7.5 mm
• Overall Length: 100 mm
• Head Type: Countersunk Flat Head — T30 Torx Drive
• Point Style: Sharp Point
• Thread Profile: Sharp, Specialised Design — self‑tapping, with debris‑clearance geometry
• Material: Hardened and Tempered Carbon Steel
• Coating: Zinc (Electro‑Galvanised) — corrosion resistance
• Compatible Substrates: Concrete, Solid Brick, Aerated Concrete, Natural Stone, Hollow Brick
• Compatible Fixtures: PVC, Aluminium, Timber, Steel Sections
• Recommended Pilot Hole: 6 mm diameter
• Packaging: 100 Pieces per Box

Applications

• Fixing PVC and aluminium window and door frames to concrete walls
• Mounting cabinets, shelves, and hanging systems to aerated concrete and brickwork
• Securing external cladding, panels, and curtain‑wall components
• Anchoring electrical boxes, plumbing brackets, air‑conditioning, and ventilation supports
• Fastening timber beams, frames, and structural supports to concrete floors and walls
• 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; delivers major savings in material cost and labour time
• Self‑Tapping Thread: Cuts its own thread inside the pilot hole for a tight, secure hold; flushes out dust to prevent jamming
• High Holding Strength: Creates a monolithic bond with the base; pull‑out and load‑bearing performance matches plugged anchor systems
• T30 Torx Drive: Screwdriver bit seats fully; no cam‑out or slipping; dependable performance in high‑volume work
• Zinc Coating: Resists corrosion for years under indoor and sheltered outdoor conditions
• Hardened Steel: Resists bending and breaking during driving; ensures deep, consistent penetration
• 100 mm Length: Ideal for thick frame sections and applications requiring deep embedment
• Removable and Reusable: Can be unscrewed and re‑fastened as needed; not a permanent, non‑reversible anchor

Installation Guidelines

• Drill a 6 mm pilot hole in concrete; make the hole approx. 5 mm deeper than the screw’s intended embedment length
• Remove all dust from the hole; residual debris will prevent the screw from seating tightly
• Drive the screw at a true right angle to the surface; angled installation weakens thread engagement and may snap the screw
• Use a T30 Torx driver bit; apply steady torque without over‑tightening
• Reduce pilot hole diameter to 5 mm for aerated concrete; softer blockwork requires a smaller starting hole
• Do not over‑tighten in hollow brick or lightweight masonry; internal webs may fracture
• Select stainless steel versions for consistently damp, wet, coastal, or fully exposed outdoor environments
• For high‑load‑critical projects, consult structural calculations to determine fastener quantity and spacing

Frequently Asked Questions

Does this screw replace wall plugs entirely?
Yes — its specialised thread design cuts its own secure grip directly into the prepared pilot hole, eliminating the need for a separate plastic or metal plug.

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

Can it be used in timber and PVC?
Yes — frame installation is one of the most common applications for this fastener.

How much weight will it support?
Rated load depends on base material type, thickness, and embedment depth; it delivers reliable performance in concrete — always refer to manufacturer data for critical or engineered applications.

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