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, #6 x 3/4" $10.33 Blind Rivet, 1/8" x 1/4" $43.39 Stainless Fender Washer 1/4", .062" Thick ,OD 1" $39.24 Phillips Tapping Screw - Truss Head #10 x 3/4" $31.18 Blind Rivet, 1/8" x 1/2" $71.23