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 Nylon Flat Washer #6, 0.32" Thick, OD 3/8" $17.45 Tee Nut - Stainless 10-24 $37.98 Stainless Countersunk Finishing Washer, #6 $13.10 Flat Washer, 3/4", .109" Thick, OD 1-7/8" $47.99 Stainless Cotter Pin 1/8" x 1-1/2" $55.55