Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 4" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 4" $36.28 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Carriage Bolt, 1/2"-13 x 3" $92.78 Phillips Tapping Screws - Oval Head, #10 x 1-3/4" $26.77 Socket Set Screw 10-24 x 1/4" $22.63 Flat Washer, 1/2", .078" Thick, OD 1-1/4" $38.42 Phillips Wood Screw - Flat Head, #8 x 3/4" $43.08