Overview
Serrated rivets are a type of blind rivet distinguished by circumferential grooves or barbs along their shank. These grooves bite into the material during installation, creating a locking effect that resists pull-out and vibration. First patented in the mid-20th century, they address the limitations of smooth-shank rivets in dynamic load applications. Modern variants include multi-groove designs and specialized coatings for corrosion resistance.
Structure and Working Principle
The rivet consists of a head, serrated shank, and mandrel. During installation, the mandrel is pulled to deform the shank, forcing the grooves to embed into the substrate material. The teeth profile varies—triangular grooves suit soft materials like plastics, while trapezoidal grooves work better for metals. This mechanical interlocking provides up to 30% higher retention force compared to standard rivets, making them ideal for assemblies subject to shock or thermal cycling.
Key Features
Anti-vibration performance is the hallmark feature, with serrations maintaining grip even under sustained dynamic loads. The grooves also compensate for minor material thickness variations. Material options include 5056 aluminum for lightweight applications, A286 stainless steel for high-temperature environments, and carbon steel with zinc plating for cost-effective solutions. Some designs incorporate sealing washers for watertight joints.
Application Areas
Automotive manufacturers use them for underbody panels and trim attachments where road vibrations are constant. In aerospace, they secure non-structural components like cable trays. Industrial applications include agricultural machinery, conveyor systems, and electrical enclosures. The construction sector employs them for HVAC ducting and metal roofing, especially in wind-prone areas.
Maintenance and Precautions
Unlike threaded fasteners, serrated rivets are not reusable—drilling out is required for disassembly. Use carbide drill bits to prevent shank rotation during removal. Avoid installing in brittle materials like cast iron where grooves may cause cracking. For dissimilar metals, select rivet material to match the more noble substrate to prevent galvanic corrosion.
B2B Procurement Guide
Bulk purchases (10,000+ units) typically offer 15–30% cost savings. Leading manufacturers include Gesipa, Avdel, and Marson. Specify groove count (usually 3–6), grip range (material thickness + 25%), and mandrel break type (protruding or flush). For quality assurance, request certification to ISO 15977 (blind rivets) or ASME B18.1.3 standards.
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