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 Seachoice 01531 Hex Nut, 3/8-16 $30.68 Phillips Tapping Screws - Flat Head, #14 x 1" $45.79 Seachoice 01009 Lock Washer, 1/4" $13.60 Phillips Tapping Screws - Oval Head, #12 x 1" $45.16 Phillips Tapping Screws - Oval Head, #10 x 3" $32.37