Mili Std - Steel Dry Filmed Nut, Self-Locking, Hexagon | MS21045L8 

• Thread Class: 3B
• Thread Direction: Right-Hand
• Locking Feature: Prevailing Torque All Metal Design
• Lubrication: Dry Film Lubricant
• Nut Style: Hexagon
• Nut Height: 0.575 Nominal Mils And 0.610 Nominal Centimeters
• Width Across Flats: 0.741 Inches Minimum And 0.752 Inches Maximum
• Temp Rating: 450.0 Deg Fahrenheit Nominal
• Thread Series: Unjf
• Thread Quantity Per Inch: 20
• Nominal Thread Size: 0.500 Inches
• Countersink Angle: 88.0 Degrees Nominal Nut
• Bearing Surface Type: Chamfered
• Bearing Surface Finish: 125.0 Microinches
• Material: Steel Overall
• Surface Treatment: Cadmium Overall
• Surface Treatment Document And Classification: Qq-P-416 Fed Spec Single Treatment Response Overall