Lock Nut Dimensional Standards MIL-S-7742 NASM25027 Finish Cadmium Plated Hex Height 7/64 in Hex Type Standard Heavy Hex Hex Width 9/16 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 Resistant Shock and Vibration Resistant System of Measurement Inch Thread Direction Right Hand Thread Fit 2B Thread Size 5/16 In.-18