RJ-502206-2 - 1/2 in. Jam Nut (Thin, 1/2 in.-20, LH Thread) SKU RJ-502206-2 $1.70 Quantity discounts available QuantityPrice Quantity -+ Add to Cart Details 1/2 in.-20 LH thread Jam Nut features a thin (5/16 in.) height for use in tighter applications. Grade 5, gold zinc plated. Details Back Details1/2 in.-20 LH thread Jam Nut features a thin (5/16 in.) height for use in tighter applications. Grade 5, gold zinc plated.