Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 3/4" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 3/4" $24.06 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Square Tapping Screw - Flat Head,#8 x 1" $27.12 Nylon Flat Washer 1/4", 0.56" Thick, OD 11/16" $24.88 Phillips Tapping Screw - Pan Head, #12 x 1-1/2" $30.92 Phillips Tapping Screw - Pan Head, #14 x 3/4" $49.38 Flat Washer, #4, .032" Thick, OD 5/16" $6.74