Online Parts Store › Nylon Insert Locknut - Stainless 1/4-20 Image 1 of 1 Nylon Insert Locknut - Stainless 1/4-20 $27.84 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #8 x 1-1/2" $25.70 Nylon Flat Washer 5/16", 0.62" Thick, OD 7/8" $37.54 Phillips Tapping Screws - Flat Head, #14 x 3" $59.58 Phillips Tapping Screw - Pan Head, #8 x 5/8" $18.01 Phillips Tapping Screw - Truss Head #8 x 1/2" $18.52