Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 2-1/2" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 2-1/2" $21.73 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, #10, .050" Thick, OD 9/16 $16.12 Stainless Cotter Pin 1/16" x 3/4" $17.76 Phillips Wood Screw - Flat Head, #14 x 3" $73.50 Phillips Tapping Screws - Oval Head, #12 x 1" $45.16 Carriage Bolt, 1/2"-13 x 4" $109.86