Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 4" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 4" $36.28 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #10 x 3/4" $32.06 Flat Washer, 1/2", .078" Thick, OD 1-3/8" $74.51 Nylon Flat Washer 1/4", 0.56" Thick, OD 11/16" $24.88 Phillips Tapping Screws - Flat Head, #12 x 2-1/2" $41.63 Stainless Cotter Pin $169.61