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 Square Tapping Screw - Flat Head,#8 x 1-1/4" $28.68 Stainless Cotter Pin 1/16" x 3/4" $17.76 Flat Washer, 3/8", .062" Thick, OD 1" $40.34 Nylon Insert Locknut - Stainless 7/16-14 $21.10 Flat Washer, #8, .032" Thick, OD 3/8" $5.42