CRL 1/4"-20 A-T series insert fasteners can be used in light and medium duty fastening applications. They can be installed into thinner materials with greater ease than can be accomplished with weld nuts, pierce nuts, clinch nuts, thread tapping, and thread forming screws. The unique method of installing load threads in virtually any material including aluminum, magnesium, steel, cast iron, plastics, fiberglass, or hardboard They are "non-grip sensitive", one Steel Insert Fastener part number per thread size accommodates any grip over .030", eliminating the need for various grip ranges. The unique feature of CRL Riv-Nuts Steel Insert Fasteners is the axial knurl under the flange of the insert. The expansion of the sleeve causes the knurl to bite into the parent material, providing greater torque resistance. Use CRL Riv-Nuts Steel Insert Fasteners to improve your product and speed up production. They're ideal for high-speed installations, as well as low volume applications using manual tools.