Online Parts Store › Phillips Machine Screw - Pan Head. 5/16"-18 x 2-1/2" Image 1 of 1 Phillips Machine Screw - Pan Head. 5/16"-18 x 2-1/2" $21.73 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Flat Head, #14 x 1-3/4" $36.21 Stainless Cotter Pin 1/16" x 1/2" $9.76 Lag Screw, 3/8 x 3" $41.46 Socket Set Screw 1/4"-20 x 1/4" $26.96 Phillips Tapping Screws - Flat Head, #8 x 3/4" $12.91