High-Performance Metal Frame Anchors for Secure Window & Door Installation
The Handan Bolt Metal Frame Anchor (also known as a Metal Frame Fixing or Express Nail) is a specialized, heavy-duty fastener designed for the stress-free standoff installation of window and door frames. Comprising a zinc-plated steel sleeve, a threaded screw with a countersunk head, and a captive cone nut, this anchor provides a rigid, permanent fixing in concrete, solid brick, and hollow block substrates.
Unlike traditional nylon plugs, our all-steel construction ensures maximum load-bearing capacity and shear strength, making it the preferred choice for professional installers fixing uPVC, aluminum, and timber frames.
Engineering Principle: Stress-Free Standoff Installation
One of the critical challenges in frame installation is preventing the frame from bowing or distorting during tightening. Our Metal Frame Anchor utilizes a unique cone expansion mechanism. When the screw is tightened, the cone nut is pulled into the sleeve, expanding it against the wall of the drilled hole.
Crucially, this expansion occurs only at the anchor point in the masonry, not within the frame itself. This allows for a “standoff” fixing where the frame is held firmly in position without being pulled towards the wall, ensuring the window or door remains perfectly square and operational.
Fire Resistance & Safety Compliance
In modern construction, fire safety is paramount. Unlike plastic or nylon frame fixings which can melt under high temperatures, causing frames to collapse and blocking escape routes, our All-Metal Frame Anchors are non-combustible. They maintain their structural integrity in the event of a fire, complying with strict building regulations for fire-rated door assemblies.
For more information on the importance of fire-resistant fasteners in construction, you can refer to the Passive Fire Protection entry on Wikipedia.
Key Technical Specifications
- Material: High-grade Carbon Steel.
- Corrosion Protection: Yellow Zinc Plated or Blue/White Zinc Plated (CR3+) options available for long-lasting rust resistance (min 5µm).
- Head Style: Countersunk (CSK) head with Philips (Pozidriv) or Torx drive for high torque transmission.
- Anti-Rotation Lugs: The sleeve features specialized ribs/lugs near the collar to prevent the anchor from spinning in the hole during installation.
- Versatility: Suitable for push-through installation in concrete, solid brick, perforated brick, natural stone, and aerated concrete.
Installation Guide (Best Practices)
To ensure a secure fix and maximize the pull-out value, follow these factory-recommended steps:
- Drill: Drill a 10mm hole (or 8mm depending on anchor size) through the frame and into the masonry substrate to the required depth.
- Clean: Essential step – remove dust and debris from the hole using a blow-out pump or vacuum. Dust can significantly reduce holding power.
- Insert: Push the assembled anchor through the frame into the hole until the sleeve collar is flush with the frame profile.
- Tighten: Tighten the screw using an impact driver or screwdriver. As the screw turns, the cone is drawn up, expanding the sleeve deep inside the masonry.
- Cap (Optional): Apply a plastic cover cap to conceal the screw head for a neat finish.
Why Choose Handan Bolt?
As a dedicated fastener manufacturer, we control every stage of production from wire drawing to plating. Our Metal Frame Anchors undergo rigorous tensile testing to ensure they meet international safety standards.
Available Sizes: M8 and M10 diameters, with lengths ranging from 72mm to 202mm to accommodate various frame thicknesses and gap widths.
Do you require a custom size or a specific plating thickness for a large project? Click here to contact our export team for a competitive quote and free samples.
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