Online Parts Store › Nylon Insert Locknut - Stainless M4-.7 Image 1 of 1 Nylon Insert Locknut - Stainless M4-.7 $23.30 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Oval Head, #10 x 3/4" $23.24 Phillips Tapping Screws - Flat Head, #6 x 1" $11.21 Phillips Tapping Screw - Pan Head, #8 x 5/8" $18.01 Phillips Tapping Screw - Pan Head, #10 x 5/8" $24.31 Stainless Cotter Pin 5/32" x 1-1/4" $33.25