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 - Flat Head, #14 x 3/4" $44.09 Flat Washer, #4, .032" Thick, OD 5/16" $6.74 Stainless Cotter Pin 1/8" x 2" $18.81 Phillips Tapping Screws - Flat Head, #4 x 3/4" $13.73 Phillips Tapping Screws - Oval Head, #10 x 5/8" $28.59