Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 1-1/2" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 1-1/2" $42.20 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Nylon Insert Locknut - Stainless 5/16-24 $46.35 Phillips Tapping Screws - Oval Head, #10 x 1-1/2" $36.59 Seachoice Hex Nut, 5/16-24 $58.82 Carriage Bolt, 1/2"-13 x 5" $49.07 Stainless Cotter Pin 5/32" x 2" $84.08