About

About J.Lanfranco Fastener Systems Inc About J. Lanfranco Fastener Systems Inc. J.Lanfranco locknuts have been trusted by mining operators for more than 40 years. The single piece all-metal design resists vibration, shock, and corrosion. Capable of being installed on standard bolts using standard tools, our THU locknuts will not damage bolts or succumb to seized nuts – even under the most extreme mining environments. J.Lanfranco makes the toughest all‑metal locknuts on the market. Easy to install with standard tools, they’re built to resist shock, vibration, and wear in any application. Available in metric and Imperial sizes with multiple materials and finishes, our locknuts keep mining and processing operations running smoothly—eliminating costly downtime and maintenance. J.Lanfranco locknuts have been trusted by mining operators for more than 40 years. The single piece all-metal design resists vibration, shock, and corrosion. Capable of being installed on standard bolts using standard tools, our THU locknuts will not damage bolts or succumb to seized nuts – even under the most extreme mining environments. J. Lanfranco Fastener Systems is a global leader in the design and manufacture of safety-critical fastening solutions for the transit industry. Trusted by major transit authorities and rolling stock manufacturers worldwide, J. Lanfranco delivers engineered self-locking nuts, modular fastening systems, specialty washers, and application-specific components that meet the most demanding operating conditions. Our solutions are purpose-built to maximize Safety, Performance, and Reliability—reducing risk, extending service life, and ensuring consistent performance under severe vibration and high-load conditions. Fastening systems are not just components—they are critical systems designed to protect infrastructure, equipment, and the people who rely on it every day.