Cap Nut Material Grade/Class 18-8 Material Stainless Steel Finish Plain Thread Size 5/16 In.-18 Overall Height 0.531 in Hex Width 1/2 in Tensile Strength 85 000 psi Dimensional Standards SAE J483 Material Quality Standards AISI Grade 303 ASTM System of Measurement Inch Lock Type Self-Locking Pack Size Small Pack Removable Yes Resistance Properties Corrosion Resistant Rockwell Hardness B83 to B95 Thread Direction Right Hand Package Quantity 10