Online Parts Store › Nylon Insert Locknut - Stainless 1/2-13 Image 1 of 1 Nylon Insert Locknut - Stainless 1/2-13 $35.14 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, 7/16", .062" Thick, OD 1-1/8" $27.80 Square Tapping Screw - Flat Head,#10 x 2" $31.61 Stainless Fender Washer 3/8", .078" Thick, OD 1-1/2" $54.73 Phillips Tapping Screw - Truss Head #10 x 1-1/4" $50.76 Flat Washer, 1/4", .050" Thick, OD 11/16" $17.26