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 Fender Washer 1/4", .062" Thick1/4", OD1-1/4" $59.33 Square Tapping Screw - Flat Head,#10 x 1-1/4" $48.20 Stainless Cotter Pin $169.61 Flat Washer, 1/2", .078" Thick, OD 1-1/4" $38.42 Phillips Tapping Screw - Truss Head #8 x 3/4" $17.19