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 01006 Lock Washer, #8 $15.43 Flat Washer, #4, .032" Thick, OD 5/16" $6.74 Nylon Insert Locknut - Stainless 10-32 $25.51 Phillips Tapping Screw - Pan Head, #10 x 3" $37.54 Flat Washer, #10, .050" Thick, OD 7/16 $13.35