Threaded Rivet

Overview

Threaded rivets, also known as rivet nuts or blind threaded inserts, are specialized fasteners that provide threaded holes in materials too thin or fragile for traditional tapping. Unlike solid rivets, they allow repeated assembly and disassembly via machine screws or bolts. Their design typically includes a cylindrical body with internal threads and an external gripping mechanism (such as knurling or ribs) to prevent rotation once installed. Originally developed for aviation in the 1940s, these rivets now serve industries requiring lightweight yet robust threaded connections. Common installation methods include manual tools, pneumatic squeezers, or hydraulic presses, with variations like bulge-type or countersunk heads for specific flush-mount needs.

Structure and Working Principle

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A standard threaded rivet comprises three key parts: the head (to bear load), the shank (with external features for grip), and the internally threaded bore. Installation involves inserting the rivet into a pre-drilled hole and deforming the shank using a mandrel or tool. This expansion creates a permanent mechanical lock against the host material’s backside while preserving the internal threads. For blind applications (where only one side is accessible), pull-through designs use a threaded mandrel to collapse the rivet body radially. Materials like stainless steel (A2/A4 grades) resist corrosion, while aluminum variants reduce weight. High-strength steel versions (e.g., 8.8 or 10.9 grade) handle greater tensile loads.

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Key Features

Reusability sets threaded rivets apart from conventional rivets—their internal threads accommodate repeated bolt insertions without wear. Vibration resistance is achieved through tight tolerances and locking features like nylon inserts or deformed thread sections. Some models include sealing flanges to prevent fluid ingress in automotive or marine environments. Metric (ISO) and imperial (UNC/UNF) thread standards are available, with M3–M12 and #4–½" diameters being most common. Specialty versions offer electrical conductivity (copper alloys) or non-magnetic properties (phosphor bronze). Testing certifications like ISO 15983 (for blind rivet nuts) ensure performance consistency.

Application Areas

In automotive manufacturing, threaded rivets secure panels, brackets, and wiring harnesses while allowing service access. Aerospace applications use lightweight aluminum or titanium rivets for avionics mounts and interior fittings. Electronics manufacturers favor miniature versions (e.g., M1.6 threads) for PCB standoffs and chassis assembly. Construction equipment employs large-diameter rivets (up to M20) to attach hydraulic components. Consumer goods like furniture and appliances use them for modular designs requiring field adjustments. The oil/gas industry relies on corrosion-resistant variants for offshore platforms and pipelines.

Maintenance and Precautions

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Threaded rivets require minimal maintenance but benefit from periodic thread inspection. Lubricate threads with anti-seize compound in high-temperature or saline environments to prevent galling. Avoid using impact drivers on small-diameter rivets (<M5) to prevent thread stripping. For removal, carefully drill out the rivet if damaged, ensuring the host material remains intact. Always select rivet lengths 1.5x the material thickness for optimal grip. In dissimilar metal pairings (e.g., aluminum rivets in steel), isolate materials with dielectric coatings to prevent galvanic corrosion.

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B2B Procurement Guide

Bulk purchases (1,000+ units) typically reduce costs by 20–40%. Request material certifications (e.g., RoHS, REACH) for regulated industries. Leading manufacturers include Bollhoff, PEM®, and Avdel (Stanley Engineered Fastening). Evaluate suppliers based on lead times (standard sizes often ship within 2 weeks), custom machining options (e.g., non-standard threads), and packaging (bulk bins vs. labeled bags). For prototyping, order sample kits with multiple sizes. Online platforms like Alibaba or ThomasNet facilitate supplier comparisons but verify quality via third-party inspections.