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 Stainless Cotter Pin 1/16" x 3/4" $17.76 Square Tapping Screw - Flat Head,#8 x 1-1/4" $28.68 Seachoice 01008 Lock Washer, #12 $16.44 Phillips Tapping Screws - Flat Head, #14 x 1-1/2" $28.97 Carriage Bolt, 1/2"-13 x 3" $92.78