Online Parts Store › Phillips Machine Screw - Pan Head. 1/4"-20 x 3-1/2" Image 1 of 1 Phillips Machine Screw - Pan Head. 1/4"-20 x 3-1/2" $46.42 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #10 x 2-1/2" $37.66 Stainless External Tooth Lock Washer #10 $14.42 Phillips Tapping Screw - Pan Head, #8 x 1-1/4" $27.71 Phillips Tapping Screw - Pan Head, #10 x 1" $29.03 Phillips Tapping Screw - Pan Head, #8 x 1/2" $13.86