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Bard part number 1012-231 is an OEM 4-40 steel Keps hex nut with zinc plating used throughout Bard wall-mounted HVAC equipment wherever a small machine-screw fastener needs added vibration resistance. The captive external-tooth lock washer is built into the nut, helping it bite into the mating surface as you tighten it so panels, brackets, and control-box hardware stay secure during blower and compressor operation. This is the correct Bard-specified hardware for matching factory thread size and fit, which helps avoid stripped screws, loose electrical mounting points, or rattles caused by using the wrong nut style or washer combination.
* Orders less than $50 may incure a minimum order fee.