A112 is a nickel plated hex nut designed for secure switch mounting applications. It features a 1/4-40 thread size with a 5/16 inch hex dimension and 30° chamfer on both faces for easy installation. The nut is commonly used as a back-up nut in conjunction with lockwasher A115 to provide secure, vibration-resistant mounting for toggle switches and pushbuttons. This hardware accessory is ideal for panel mounting applications where reliable fastening is required.