Description of rolled copper nut
1, Product Definition and Core Features
Rolled copper nut is a fastener made of copper alloy (such as H62 brass, C3604 lead brass) as the substrate, formed by cold heading/machining, and rolled with straight/mesh patterns on the surface. It has conductivity, corrosion resistance, and anti loosening function, and is widely used in fields such as electronics, machinery, and automobiles. The core design logic is:
• Roll pattern structure: By physical extrusion, tooth shaped patterns (depth 0.05-0.2mm) are formed to increase frictional resistance with the substrate;
Copper based characteristics: Utilizing copper's conductivity (≥ 58MS/m) and corrosion resistance (salt spray test ≥ 72h), it is suitable for precision equipment.
2, Technical parameters and structural analysis
1. Key Parameters [Table]
Application scenarios of parameter standard value range
Material H62 brass (Cu62%, Zn38%) for electronic device casing and communication module
Hardness HB80-120 (annealed state) thin plate installation to avoid crushing the substrate
Thread specifications M2-M10 (metric), 4-40UNC (imperial) PCB board fixing, sensor bracket
Roll pattern type: straight grain (120 °), mesh pattern (diamond cross), vibration environment anti loosening, shaft connection
Surface treatment includes nickel plating (Ni ≥ 5 μ m), passivation, natural polishing for oxidation prevention (nickel plating), and conductivity requirements (natural color)
2. Structural innovation points
Double end embossing design: one end is embossed and the other end is chamfered, balancing anti loosening and guiding functions (such as M3 × 0.5 nuts, chamfered 15 °);
Thin wall strengthening process: By cold extrusion, the wall thickness is thickened (conventional 0.8mm → 1.2mm), and the torsional strength is improved (≥ 15N · m).
3, Application scenarios and selection logic
1. Typical application scenarios
Electronic devices: fixing the phone frame to the PCB board (M2 × 0.4 embossed copper nut, nickel plated for oxidation prevention);
Automotive industry: connection between sensors and metal brackets (M4 × 0.7 mesh roller pattern, high temperature resistance of 150 ºC);
Precision instrument: Optical lens focusing ring (M2.5 × 0.45 straight line rolling, low friction coefficient ≤ 0.15).
2. Three step selection method
Step 1: Substrate matching
Soft plastic (such as PC): choose straight grain embossing+annealed state (hardness HB80) to avoid cracking;
Metal substrate (such as aluminum alloy): Choose mesh rolling and nickel plating to enhance corrosion resistance.
Step 2: Load verification
Static load: The tensile strength of a single M3 knurled copper nut is ≥ 300N (measured data);
Dynamic load: No loosening after 2000 cycles of vibration testing (10-55Hz, 1.5mm amplitude).
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