Online Parts Store › Nylon Insert Locknut - Stainless M5-.8 Image 1 of 1 Nylon Insert Locknut - Stainless M5-.8 $15.56 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Stainless Countersunk Finishing Washer, #6 $13.10 Nylon Insert Locknut - Stainless 1/2-13 $35.14 Phillips Tapping Screw - Pan Head, #10 x 1-1/4" $32.56 Phillips Tapping Screws - Oval Head, #12 x 2-1/2" $39.93 Stainless Cotter Pin 1/8" x 1-1/4" $65.75