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 - Oval Head, #12 x 3/4" $33.07 Stainless External Tooth Lock Washer 5/16" $19.48 308 Piece Stainless Steel Fastener Display $6,664.43 Lock Washer, M4 $10.20 Tee Nut - Stainless 5/16"-18 $26.64