Overview

Flat head auto fastener semi-hollow/semi-tubular step rivets are specialized fasteners characterized by a flat head, a partially hollow or tubular shank, and a distinct “step” or shoulder along the shank. This design allows them to create a strong, low-profile joint where the stepped portion serves as a spacer or a bearing surface. The semi-hollow/semi-tubular nature reduces the force required for riveting and allows for material flow, enabling strong but less critical joints than solid rivets.

Definition

Flat head auto fastener semi-hollow/semi-tubular step rivets are mechanical fasteners featuring a flat, low-profile head, a partially hollow or tubular body, and a specific “step” or change in diameter along the shank. This step acts as a locating or spacing feature, while the semi-hollow design facilitates efficient installation and forms a secure joint by flaring or crimping the tubular end. They are commonly used in automotive and other industries where a consistent stand-off and a strong, yet easily formed, connection are required.

Key Features

• Flat Head: Provides a low-profile, aesthetic finish once installed, suitable for applications where minimal protrusion is desired.
• Semi-Hollow / Semi-Tubular Shank: The partially hollow design reduces the material required and the force needed for riveting, making them ideal for softer materials or high-speed assembly. It allows the end of the rivet to be easily flared, crimped, or rolled to form the secondary head.
• Step/Shoulder: A distinct change in the shank diameter functions as a spacer or bearing surface, controlling the distance between joined components or providing a specific pivot point.
• Material Versatility: Can be made from various materials like steel, aluminum, brass, or copper, depending on application requirements for strength, corrosion resistance, and conductivity.
• Permanent Fastening: Forms a permanent, secure mechanical joint that is resistant to loosening from vibration.

Applications

• Automotive Industry: Widely used in car interiors, trim, dashboards, seat components, and various body assemblies where a secure, flush, and often spaced connection is needed.
• Appliance Manufacturing: Employed in household appliances to join components, provide pivot points, or act as stand-offs for electronic parts.
• Electronics: Used in circuit boards and electronic enclosures for fastening components while maintaining specific spacing.
• Light Fabrication: Suitable for joining sheet metal, plastic, and other light materials in various manufacturing processes.
• Consumer Goods: Found in toys, sporting goods, and other consumer products requiring reliable, low-cost assembly.

Advantages

• Efficient Assembly: Semi-hollow design reduces riveting force, making them suitable for automated assembly processes and joining delicate materials.
• Integrated Spacing/Locating: The “step” feature inherently provides precise spacing, eliminating the need for additional washers or spacers.
• Cost-Effective: Generally more economical than threaded fasteners, especially for high-volume production.
• Strong, Permanent Joint: Forms a robust mechanical interlock that is resistant to vibration and fatigue.
• Versatile Design: Can be customized in terms of head style, shank length, and step dimensions to meet specific application needs.