Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 3" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 3" $28.28 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Nylon Flat Washer 1/2", 0.62" Thick, OD 1-1/4" $36.72 Stainless Fender Washer 1/4", .062" Thick, OD 1-1/2 $103.98 Nylon Insert Locknut - Stainless 7/16-14 $21.10 Phillips Tapping Screws - Oval Head, #12 x 3/4" $33.07 Flat Washer, 3/8", .062" Thick, OD 1" $38.36