April 17, 2015 Online Store No Comments +3 Nylok Nuts NS51 C$0.55 In stock Quantity: 1 Add to Bag Product Details Grade 5, zinc plated. Some available in thin sizes. 1/4-20 SS, 3/8-16, 5/16-18, 7/16-14, 7/16-20, 1/2-20, 9/16-18, 5/8-18. Save this product for later Favorite