Selectron 7.5x150 Buldex Screw (100 Pieces

Selectron 7.5×150 Buldex Screw — 100 Pieces

The Selectron 7.5×150 mm Buldex Screw is a long‑length fastener designed for direct installation without wall plugs into solid structural surfaces such as concrete, aerated concrete, brick, and natural stone. With an overall length of 150 mm, it is the ideal solution for thick cladding layers, fixings requiring deep anchoring, and securing multi‑layered building components together. It forms its own thread within the pilot hole to create a monolithic bond with the base material — eliminating both plug cost and extended installation time. Featuring a T30 Torx drive and zinc‑coated robust body, it delivers reliable performance in high‑load projects. The 100‑piece box provides a practical supply option for medium‑ and large‑scale construction, facade, and residential projects.

Technical Specifications

• Brand: Selectron
• Type: Buldex Screw / Plug‑Free Masonry Fastener
• Diameter: 7.5 mm
• Overall Length: 150 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: 100 Pieces per Box

Applications

• Deep anchoring of medium‑thickness PVC and aluminium window and door systems
• Fixing timber beams, 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, air‑conditioning units, machine brackets, and service connections
• High‑capacity fixing in aerated concrete and lightweight concrete walls
• Prefabricated building, renovation, and refurbishment projects
• Wall and ceiling connections requiring moderate‑depth embedment

Product Advantages

• Plug‑Free Installation: No separate wall plug required — saves material cost and reduces labour time
• 150 mm Ideal Length: Penetrates through thick sections and cladding to reach the structural wall; more economical and practical than the 180 mm and 200 mm variants
• 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 speed and reliability in high‑volume work
• Zinc Coating: Long‑term corrosion resistance for indoor and sheltered outdoor environments
• Hardened Steel: Resists bending and breaking during installation; provides deep, firm holding power
• Removable and Reusable: Not a permanent, irreversible anchor — can be easily extracted and re‑installed as needed
• 100‑Piece Box: Uninterrupted supply for medium‑scale projects; cost‑effective stockholding with competitive unit pricing

Installation Guidelines

• Drill a 6 mm pilot hole in concrete or solid brick; use 5 mm for aerated concrete; make the hole approx. 10 mm deeper than the screw’s intended embedment
• Fully clear dust from the bore using a brush or compressed air — residual debris reduces holding power
• Drive the screw at a true right angle to the surface; the extended shank is more sensitive to angled insertion, which weakens engagement and may cause breakage
• Use a T30 Torx driver bit with a high‑torque, low‑speed screwdriver; do not over‑tighten
• Apply moderate torque in hollow brick or lightweight masonry; internal webs may fracture under excessive force
• Select stainless steel versions for persistently humid, rainy, or coastal environments
• For high‑load‑critical applications, determine fastener count and spacing based on structural calculations
• Store in dry conditions; prolonged moisture exposure shortens coating life

Frequently Asked Questions

Does it hold firmly 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 7.5×180 version?
This model is 150 mm long, ideal for moderate‑depth connections; the 180 mm version is preferred for thicker assemblies and deeper embedment.

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 frame installations: a minimum of two at each corner, spaced 300–400 mm along intermediate runs; increase quantity in line with applied load.