Overview Reviews Product Description Engine stud nuts are used with all types of engine studs. Made of brass for a high quality look for any repair and are made of non-magnetic material that offers excellent corrosion resistance. Papco Nuts Catalog Product Videos Custom Field Box quantity 25 Diameter 5/16"-18 Product Reviews Write a Review Write a Review × Paulin 5/16"-18 UNC Brass Engine Stud Nut 25 Pc. 264-954 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *