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 Phillips Tapping Screws - Oval Head, #10 x 3/4" $23.24 Phillips Tapping Screws - Flat Head, #14 x 1-3/4" $36.21 Phillips Tapping Screw - Pan Head, #8 x 3/8" $12.60 Stainless Cotter Pin 3/32" x 3/4" $22.42 Nylon Flat Washer #10, 0.32" Thick, OD 7/16" $17.32