Dongshuo Fastener
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Flat Head: Aligned with the surface of the workpiece after installation, reducing protrusions for a streamlined appearance.
Conical bottom surface: Usually conical to be embedded into pre-made counterbores for a better fit.
Features a central hexagonal groove (ISO 4762) that fits internal wrenches, allowing high torque transmission without slipping.
Available in metric coarse (M4, M6) or fine threads (M8 × 1.25). Length and diameter are customizable.
Mechanical manufacturing: Assembly of precision equipment like machine tools and molds in limited spaces.
Automotive industry: Reliable connections for engine components, transmissions, and chassis.
Electronic products: Structural fixation for compact devices like laptops and mobile phones.
Aerospace: High-strength, lightweight design connection points.
Large contact area between the hexagonal hole and wrench withstands greater tightening torque.
Flat head design occupies no external space, ideal for aesthetic and compact installations.
Works effectively with spring washers or thread glue to prevent vibration-induced loosening.
Provides a flat surface without exposed bolt heads for high appearance requirements.
Texture of Material: Carbon steel (galvanized/blackened), Stainless steel (304/316), Titanium alloy.
Size Standard: Metric (ISO 4762), American (ANSI/ASME B18.3), Diameter range M2 to M24.
Surface Treatment: Galvanized (rust proof), Dacromet (corrosion resistance), Electrophoretic (decorative coating).
