Round Head Weld Nuts
Size: M4-M10mm
Primary Material
- Low-Carbon Steel: The most common materials are low-carbon steels (e.g., 10B21, Q235, or equivalent) due to their excellent welding capability and ductility. These materials ensure reliable fusion during projection welding without hardening cracks.
- Stainless Steel (optional): For specialized corrosion-resistant applications, though less common for standard projection welding.
Surface Treatments
- Black Oxide / Phosphate: Provides basic rust prevention and a black finish; phosphate also improves weld conductivity and oil retention.
- Zinc Plating (White/Yellow): Used for higher corrosion resistance in outdoor or humid environments.
Key Features of Round Head Weld Nuts
- Cylindrical Boss with Internal Thread: Provides a longer thread engagement length than the sheet thickness, ensuring strong clamping force.
- Flanged Base with Weld Projections (visible as small raised bumps in the image): The projections concentrate welding current to form a strong nugget quickly.
- Compact Size (M10 and below): Ideal for automated assembly lines and high-volume production.
- Flange Design: Distributes clamping stress over a larger area to prevent sheet metal deformation.
Key Advantages of Round Head Weld Nuts
- High Load-Bearing Capacity: The extended thread engagement resists pull-out forces and torque, preventing thread stripping.
- Reliable & Precise Positioning: Projection welding creates a strong, localized bond without damaging the workpiece surface, ensuring accurate placement.
- Prevents Sheet Deformation: The wide flange spreads the fastening load, protecting thin panels from being crushed or warped.
- Suitable for Automation: Small sizes (M6–M8) are easily fed and welded in automated resistance welding processes, boosting efficiency.
- Cost-Effective: Eliminates the need for thick base materials or complex tapping operations on thin sheets.
Main Applications of Round Head Weld Nuts
Because these round head weld nuts solve the problem of thin sheet metal that cannot be directly tapped, they are widely used in:
- Automotive & Heavy Machinery: Body frames, chassis attachments, engine brackets, and structural panels.
- Home Appliances & Electronics: Mounting points inside sheet-metal enclosures for air conditioners, washing machines, and electronic chassis.
- Construction & Hardware: Steel structures, shelving, and general machinery where components must be fastened to metal plates.
Our Custom Service for Round Head Weld Nuts
1. Provide us with the parameters:
- Dimension Requirements ( thread size, head size, height, etc.)
- Material ( stainless steel, carbon steel, etc.)
- Surface treatment requirements (Black Oxide / Phosphate/ Zinc Plating (White/Yellow), etc.)
- Other requirements.
2. You can also send us the sample or drawing and we will study it.
Selection & Usage Notes for Round Head Weld Nuts
- Material Matching: Choose weld nuts compatible with the base metal (especially for high-strength or galvanized steel) to avoid hot cracking.
- Welding Parameters: For M10 and below (especially M6–M8), control current and cycle time carefully to prevent thread deformation or burn-through.
- Corrosion Consistency: For corrosive environments, apply post-weld coating or select zinc-plated nuts matching the base material’s protection level.
