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 Phillips Tapping Screws - Flat Head, #6 x 3/8" $9.01 Seachoice 01009 Lock Washer, 1/4" $13.60 Stainless Fender Washer 3/8", .078" Thick, OD 1-1/2" $54.73 Phillips Tapping Screw - Pan Head, #10 x 1/2" $21.73 Phillips Tapping Screw - Pan Head, #14 x 3" $61.60