Rivet Nuts are used to install a threaded insert into a material where only one side is accessible. Installed “blind”, the Rivet Nut partially collapses upon installation to grip the material between the head and compressed body. Rivet Nuts are useful for securing permanent threads into materials otherwise too thin for tapped holes. Sizes listed as Diameter - Thread Count x Length Specifications: Thread Size: #10-32 UNF Grip Range: .020 - .130 - Length: 0.435 - Installed Length: 0.275 - Head Diameter: 0.39 - Head Height (Nominal): 0.027 - Body Dia Max: 0.28 - Hole Size Across Flats: 0.281 Thread Size: 1/4-20 UNC Grip Range: .027 - .165 - Length: 0.585 - Installed Length: 0.4 - Head Diameter: 0.51 - Head Height (Nominal): 0.03 - Body Dia Max: 0.374 - Hole Size Across Flats: 0.375 Thread Size: 5/16-18 UNC Grip Range: .027 - .150 - Length: 0.685 - Installed Length: 0.53 - Head Diameter: .655* - Head Height (Nominal): 0.035 - Body Dia Max: 0.499 - Hole Size Across Flats: 0.5