Cap Nut Material Grade/Class 316 Material Stainless Steel Finish Plain Thread Size 5/8 In.-18 Overall Height 1 in Hex Width 1 1/16 in Tensile Strength 75 000 psi Dimensional Standards SAE J483 Material Quality Standards AISI Grade 316 ASTM System of Measurement Inch Color Silver Pack Size Small Pack Rockwell Hardness B80 Thread Direction Right Hand