Online Parts Store › Phillips Machine Screw - Flat Head, 3/8"-16 x 2-1/2" Image 1 of 1 Phillips Machine Screw - Flat Head, 3/8"-16 x 2-1/2" $25.76 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Oval Head, #12 x 3/4" $33.07 Stainless External Tooth Lock Washer 3/8" $34.20 Lock Washer, M5 $10.83 Flat Washer, 5/8", .078" Thick, OD 1-1/2" $22.42 Seachoice 01011 Lock Washer ,5/16" $31.68