Online Parts Store › Nylon Insert Locknut - Stainless M5-.8 Image 1 of 1 Nylon Insert Locknut - Stainless M5-.8 $15.56 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Flat Head, #8 x 3/4" $12.91 Phillips Tapping Screw - Pan Head, #8 x 3/8" $12.60 Seachoice 01533 Hex Nut, 1/2-13 $66.78 Stainless Fender Washer 1/4", .062" Thick ,OD 1" $39.24 Phillips Tapping Screws - Flat Head, #14 x 3/4" $44.09