Lock Nut, Dimensional Standards MIL-S-8879, NASM25027, Finish Black Oxide, Hex Height 13/32 in, Hex Type Standard Light Hex, Hex Width 15/16 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 , Temperature , System of Measurement Inch, Thread Direction Right Hand, Thread Fit 2B