Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 1-1/2" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 1-1/2" $42.20 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Stainless Fender Washer 5/8", .109" Thick, OD 2" $37.03 Seachoice 01009 Lock Washer, 1/4" $13.60 Phillips Tapping Screw - Pan Head, #8 x 2" $19.02 Seachoice 01007 Lock Washer, #10 $10.77 Phillips Tapping Screws - Flat Head, #6 x 5/8" $9.57