Jack Nuts Blind Expansion Fasteners
When joining thin sheet metals, hollow panels, or low-strength brittle substrates—such as plastics, fiberglass, and composite materials—conventional threaded fasteners often fail due to insufficient thread engagement or material damage. Engineered to solve challenging blind-hole applications, our high-performance Jack Nuts feature a unique body design that collapses during installation to form a broad, four-leg anchoring structure on the blind side. This dramatically increases pull-out resistance while protecting sensitive base materials from cracking or deformation.
Key Features & Technical Highlights
Broad Four-Leg Anchor Footprint: Upon tightening, the body expands outward into four wide legs, distributing clamping loads over a large surface area on the backside of the substrate.
Blind-Side Installation: Requires access from only one side of the workpiece, significantly streamlining assembly workflows and reducing labor costs in fast-paced production lines.
Wide Grip Range Capability: Highly forgiving of material thickness variations, allowing a single Jack Nut size to accommodate various panel thicknesses securely.
Soft & Fragile Material Friendly: Prevents distortion, pull-through, or cracking when installed in sensitive materials like thin aluminum, plastics, and wallboards.
Technical Specifications
Standard Materials: Carbon Steel (Zinc Plated / Nickel Plated), Stainless Steel (SUS304 / SUS316).
Thread Sizes: Metric M4 to M8 / Imperial #6-32 to 1/4"-20 (Custom lengths and special thread pitches available upon request).
Corrosion Protection: Options available for 500+ hour salt spray test resistance to meet harsh industrial environment demands.
Target Applications
Automotive & Transportation: Interior door panel trim, plastic bumper mountings, roof rack installations, and commercial vehicle bodywork.
Electronics & Appliances: Enclosure mounting, control panel brackets, and chassis assembly for telecommunications gear.
Building & HVAC Systems: Hollow metal door frames, thin sheet metal ducting, and architectural cladding fastenings.
For technical datasheets, CAD models, sample kits, or volume quotation requests, please contact our engineering sales team today.