RJ-502206-1 - 1/2 in. Jam Nut (Thin, 1/2 in.-20, RH Thread) SKU RJ-502206-1 $1.00 Quantity discounts available QuantityPrice Quantity -+ Add to Cart Details 1/2 in.-20 RH thread Jam Nut features a thin (5/16 in.) height for use in tighter applications. Grade 5, clear zinc plated. Details Back Details1/2 in.-20 RH thread Jam Nut features a thin (5/16 in.) height for use in tighter applications. Grade 5, clear zinc plated.