Self-Sealing Phillips Pan Head Screw Head Type Pan Drive Phillips Finish Plain Material 18-8 Stainless Steel Thread Size 1/4 In.-20 Fastener Length 1 in Head Width 0.517 in Head Height 0.175 in Drive Size #3 Tensile Strength 70 000 psi Dimensional Standards Not Applicable Pack Size Small O-Ring Material Silicone Rubber O-Ring Maximum Temperature 300 Degrees F O-Ring Minimum Temperature -60 Degrees F O-Ring Pressure Rating 435 psi Thread Style Fully Threaded