Online Parts Store › Nylon Insert Locknut - Stainless M8-1.25 Image 1 of 1 Nylon Insert Locknut - Stainless M8-1.25 $21.16 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, 5/16", .062" Thick, OD 7/8" $21.67 Flat Washer, #6, .032" Thick, OD 3/8" $8.19 Phillips Tapping Screws - Oval Head, #12 x 1-1/2" $30.55 Phillips Tapping Screw - Pan Head, #8 x 2" $19.02 Flat Washer, #4, .032" Thick, OD 5/16" $6.74