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 Stainless Cotter Pin $169.61 Phillips Tapping Screws - Flat Head, #14 x 1-1/2" $28.97 Flat Washer, 7/16", .062" Thick, OD 1-1/8" $27.80 Flat Washer, 1/2", .078" Thick, OD 1-3/8" $74.51 Phillips Tapping Screws - Flat Head, #14 x 1-1/4" $25.76