Online Parts Store › Phillips Machine Screw - Pan Head. 1/4"-20 x 1/2" Image 1 of 1 Phillips Machine Screw - Pan Head. 1/4"-20 x 1/2" $38.86 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Seachoice 01006 Lock Washer, #8 $15.43 Phillips Tapping Screw - Pan Head, #10 x 5/8" $24.31 Nylon Insert Locknut - Stainless 12-24 $75.96 Stainless Countersunk Finishing Washer, #10 $14.99 Phillips Tapping Screws - Flat Head, #6 x 1-1/4" $15.93