Online Parts Store › Phillips Machine Screw - Flat Head, 5/16"-18 x 2" Image 1 of 1 Phillips Machine Screw - Flat Head, 5/16"-18 x 2" $35.02 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, #4, .032" Thick, OD 5/16" $6.74 Flat Washer, #8, .032" Thick, OD 3/8" $5.42 Phillips Tapping Screws - Oval Head, #10 x 2" $27.33 Phillips Tapping Screws - Flat Head, #12 x 2-1/2" $41.63 Phillips Tapping Screws - Flat Head, #8 x 1/2" $12.41