Selectron Buldex Screw 7.5x180 (50 Pieces)

Selectron Buldex Screw 7.5×180 — 50 Pieces

The Selectron 7.5×180 mm Buldex Screw is a long‑length, purpose‑designed fastener enabling direct installation without wall plugs into solid structural substrates including concrete, aerated concrete, brick, and natural stone. With an overall length of 180 mm, it is the ideal solution for thick cladding layers, heavy‑duty fixings requiring deep anchoring, and securely joining multi‑layered building assemblies. It forms its own thread within the pilot hole to create a monolithic bond with the base material — eliminating both separate plug cost and extended installation time. Featuring a T30 Torx drive and zinc‑coated robust body, it delivers superior performance in high‑load projects. The 50‑piece box provides a practical, cost‑effective supply option for large‑scale construction, facade, and residential projects.

Technical Specifications

• Brand: Selectron
• Type: Buldex Screw / Plug‑Free Masonry Fastener
• Diameter: 7.5 mm
• Overall Length: 180 mm
• Head Style: Countersunk — T30 Torx (Star)
• Point Style: Sharp Point
• Thread Profile: Special Sharp Design — self‑tapping 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, Multi‑Leaf Walls
• Compatible Fixtures: Thick PVC/Aluminium Frames, Timber Beams, Steel Sections, Facade Panels, Thermal Insulation Systems
• Packaging: 50 Pieces per Box

Applications

• Deep anchoring of thick‑profile PVC and aluminium window and door systems
• Fixing timber beams, large frames, and structural components to concrete bases
• Securing exterior cladding, curtain‑wall panels, and thermal insulation systems
• Connecting outer finishes to the main load‑bearing wall in multi‑layer constructions
• Mounting heavy shelving, machine bases, air‑conditioning units, and load‑bearing brackets
• High‑capacity fixing in aerated concrete and lightweight concrete walls
• Prefabricated building, steel‑frame, and large‑scale renovation projects
• Deep‑embedment connections through thick wall and ceiling assemblies

Product Advantages

• Plug‑Free Installation: No separate wall plug required — lowers material cost and shortens labour time
• 180 mm Length: Ideal for thick sections, cladding layers, and deep‑anchor applications; one screw secures multiple layers in a single pass
• Self‑Tapping Thread: Forms its own thread in the pilot hole; debris channels prevent binding, ensure full seating, and resist long‑term loosening
• T30 Torx Drive: Positive bit engagement eliminates slippage and cam‑out; delivers consistent torque transfer even with long fasteners
• Zinc Coating: Long‑term corrosion resistance for indoor and sheltered outdoor environments
• Hardened Steel: Resists bending and breaking despite its extended shank; provides deep, firm holding power
• Removable and Reusable: Not a permanent, irreversible anchor — can be easily extracted and re‑installed as needed
• 50‑Piece Box: Reliable supply for uninterrupted work on large projects; practical stockholding for low‑volume long‑fastener requirements

Installation Guidelines

• Drill a 6 mm pilot hole in concrete or solid brick; use 5 mm for aerated concrete; make the hole approx. 10–15 mm deeper than the screw’s intended embedment
• Fully clear dust from the bore using a brush and compressed air — residual debris significantly reduces holding power in long‑length fixings
• Drive the screw at a true right angle to the surface; the extended shank is more sensitive to angled insertion, which weakens thread engagement and may cause breakage
• Use a T30 Torx driver bit with a high‑torque, low‑speed screwdriver; excessive speed overheats the bit and reduces performance
• Apply moderate torque and slow rotation in hollow brick or lightweight masonry; internal webs may fracture under excessive force
• Select stainless steel versions for permanent outdoor exposure, persistent humidity, or coastal environments
• For high‑load‑critical applications, determine fastener count, spacing, and embedment depth based on structural calculations
• Store in dry conditions; prolonged moisture exposure shortens coating life

Frequently Asked Questions

Does it provide sufficient grip without a wall plug?
Yes — the custom thread profile cuts its own integrated bond within the pilot hole; no separate plug is required.

How does it differ from the 7.5×200 version?
This model is 180 mm long, serving as a medium‑long option between the 150 mm and 200 mm variants; the 200 mm version is preferred where deeper embedment is required.

What load can it carry?
Capacity varies with base material; it delivers dependable performance in concrete — refer to manufacturer technical data for critical projects.

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

How many should I use?
For heavy‑duty fixings: a minimum of two at each corner, spaced 250–300 mm along intermediate runs; increase quantity in line with applied load.