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, #14 x 2" $45.91 Carriage Bolt, 1/2"-13 x 4" $109.86 Phillips Tapping Screw - Pan Head, #12 x 1-1/4" $23.49 Phillips Tapping Screws - Oval Head, #10 x 1" $27.33 Stainless Fender Washer #8, .050" Thick, OD 3/4" $21.67