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 Seachoice 01533 Hex Nut, 1/2-13 $66.78 Phillips Tapping Screws - Oval Head, #12 x 3/4" $33.07 Stainless Fender Washer 1/4", .062" Thick1/4", OD1-1/4" $59.33 Nylon Insert Locknut - Stainless 5/8-11 $35.08 Nylon Flat Washer 1/2", 0.62" Thick, OD 1-1/4" $36.72