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 Phillips Tapping Screws - Oval Head, #12 x 2" $30.67 Phillips Tapping Screw - Pan Head, #10 x 1-1/4" $32.56 Carriage Bolt, 1/2"-13 x 5" $49.07 Phillips Tapping Screw - Pan Head, #12 x 3/4" $37.60 Phillips Tapping Screws - Oval Head, #12 x 2-1/2" $39.93