Hex Standoff Thread Size #4-40 Standoff Thread Gender Male-Female Body Length 1 1/2 in Thread Length 3/16 in Body Thread Length 1/4 in Hex Width 3/16 in Square Size Not Applicable Outside Diameter 3/16 in Shape Hex Material Brass Finish Zinc Plated Pack Size Small Pack System of Measurement Inch Color Silver Stud Thread Length 3/16 in Material Quality Standards ASTM B16 Hex Width Tolerance +/-0.006 in