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 Phillips Tapping Screws - Flat Head, #8 x 1" $18.01 Flat Washer, #6, .032" Thick, OD 3/8" $8.19 Flat Washer, 3/8", .062" Thick, OD 1" $38.36 Seachoice 01011 Lock Washer ,5/16" $31.68 Phillips Tapping Screw - Pan Head, #8 x 1-1/4" $27.71