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 Screws - Flat Head, #14 x 3" $59.58 Phillips Tapping Screws - Flat Head, #14 x 2" $41.13 Nylon Flat Washer 1/2", 0.62" Thick, OD 1-1/4" $36.72 Phillips Tapping Screws - Flat Head, #12 x 3" $42.89 Nylon Flat Washer #8, 0.32" Thick, OD 3/8" $16.50