Online Parts Store › Nylon Insert Locknut - Stainless M12-1.75 Image 1 of 1 Nylon Insert Locknut - Stainless M12-1.75 $32.69 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Flat Head, #14 x 1-1/2" $28.97 Nylon Flat Washer 5/16", 0.62" Thick, OD 7/8" $37.54 Phillips Tapping Screw - Pan Head, #10 x 5/8" $24.31 Nylon Flat Washer #6, 0.32" Thick, OD 3/8" $17.45 Nylon Insert Locknut - Stainless 5/16-24 $46.35