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 Seachoice 01533 Hex Nut, 1/2-13 $66.78 Nylon Flat Washer #6, 0.32" Thick, OD 3/8" $17.45 Phillips Tapping Screw - Pan Head, #8 x 5/8" $18.01 Phillips Tapping Screws - Oval Head, #10 x 3" $32.37 Stainless Cotter Pin 3/32" x 1-1/2" $56.56