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 Cotter Pin 3/32" x 1" $46.14 Nylon Flat Washer 5/16", 0.62" Thick, OD 7/8" $37.54 Stainless Cotter Pin 1/8" x 1-1/4" $65.75 Phillips Self Drilling Screw - Pan Head #10 x 1-1/4" $37.54 Stainless Cotter Pin $147.38