Lock Nut, Dimensional Standards MIL-S-7742, NASM25027, Finish Cadmium Plated, Hex Height 3/32 in, Hex Type Standard Heavy Hex, Hex Width 1/2 in, Lock Type Flexible Top, Material Steel, Material Grade/Class Grade 2, Maximum Temperature 1,200 Degrees F, Minimum Temperature -70 Degrees F, Pack Size Small Pack, Removable Yes, Resistance Properties Impact , Shock and Vibration , System of Measurement Inch, Thread Direction Right Hand, Thread Fit 2B, Thread Size 1/4 In.-20