Thread Class: 3A Thread Direction: Right-Hand Thread Length: 0.438 Inches Minimum And 0.500 Inches Maximum Fastener Length: 0.500 Inches Nominal Head Style: Pan Head Diameter: 0.256 Inches Minimum And 0.270 Inches Maximum Head Height: 0.087 Inches Minimum And 0.097 Inches Maximum Internal Drive Style: Cross Recess Type 1 Nominal Thread Diameter: 0.138 Inches Thread Quantity Per Inch: 32 Minimum Tensile Strength: 160000 Pounds Per Square Inch Hardness Rating: 36.0 Rockwell C Minimum And 40.0 Rockwell C Maximum Screw Material: Steel Comp 8630 Screw Material Document And Classification: Mil-S-6050 Mil Spec Single Material Response Or An-S-9 Mil Std Single Material Response Screw Surface Treatment: Cadmium Or Chromium Screw Surface Treatment Document And Classification: Qq-P-416 Type 2 Class 3 Fed Spec 1St Treatment Response Thread Series Designator: Unc