Installing U Nuts and how they work. Advance Components is an authorized distributor of ARaymond/Tinnerman U Nuts, both U-shaped Speed Nuts and Tapped Barrel. U Nuts are self-retaining fasteners that don't require special tools, are vibration proof and replace clinch or weld nuts. Visit https://www.advancecomponents.com/products/araymond-tinnerman/ to purchase U Nuts today!