Colored aluminum alloy 6061 hexagon socket screw (oxidized umbrella head screw/bolt) is a fastener that combines beauty and functionality. Its core functions can be summarized as follows, which are described in layers according to importance.
1. Core functionality
High-strength and lightweight fastening
Material advantages: The tensile strength of 6061 aluminum alloy after heat treatment can reach 310MPa, which is close to some steel screws, but the weight is only 1/3 of steel, which is suitable for weight-reduction sensitive scenes such as drones and aerospace accessories.
Hexagon drive: Provides higher torque transmission efficiency, is less prone to thread slippage than cross slots or slotted slots, and is suitable for precision assembly.
Anti-loosening and sealing assistance
Umbrella head design: semicircular head + umbrella-shaped edge can increase the contact surface, disperse pressure, and prevent soft materials from being crushed; at the same time, it has a certain dustproof and waterproof penetration ability, and needs to be used with gaskets when it is not completely sealed.
Oxide layer friction control: The anodized film can adjust the friction coefficient to balance the preload and anti-loosening requirements.
2. Additional functions of surface treatment
Corrosion resistance is enhanced
The anodized layer provides basic protection, and the colored oxide film further improves the salt spray resistance through sealing treatment, which can reach more than 500 hours of neutral salt spray test. It is recommended to use stainless steel or titanium alloy in a marine climate.
Aesthetics and logo management
The colored surface is convenient for equipment assembly and identification, and improves the integrity of industrial design.
3. Application scenario adaptability
Precision electronics: M2.5-M4 small specifications are used for PCB board fixing and camera modules to avoid electromagnetic interference.
Sports equipment: M5-M8 specifications are used for carbon fiber frames and drone bodies to balance strength and weight reduction requirements.
Outdoor equipment: The oxidation color can be customized as camouflage or high-contrast color, which has both camouflage and maintenance convenience.
4. Limitation description
Torque limit: The hardness of aluminum alloy is lower than that of steel. Specifications above M8 are not recommended for ultra-high torque scenarios (such as car chassis).
Temperature limit: The long-term working temperature is recommended to be ≤150℃ to avoid oxide layer failure.
The core value of this screw lies in the trinity of "lightweight and high-strength fastening + surface protection + visual management". It is suitable for scenarios that require weight reduction, rust prevention, and appearance, but the specifications and surface treatment levels must be selected according to the specific load and environment.
