Online Parts Store › Nylon Insert Locknut - Stainless M6-1 Image 1 of 1 Nylon Insert Locknut - Stainless M6-1 $24.25 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, 1/2", .078" Thick, OD 1-3/8" $74.51 Stainless Cotter Pin $169.61 Phillips Tapping Screw - Pan Head, #14 x 1" $55.11 Phillips Tapping Screws - Flat Head, #12 x 3" $42.89 Nylon Flat Washer #6, 0.32" Thick, OD 3/8" $17.45