CE-H0020 - 1/2 In. Jam Nut (1/2 In.-20, LH Thread) SKU CE-H0020 $1.00 Quantity discounts available QuantityPrice Quantity -+ Add to Cart Details 1/2 in.-20 LH thread nut finished in gold zinc plating. We use this nut for a jam nut with our Antirock sway bar kit end link heim joints. Details Back Details1/2 in.-20 LH thread nut finished in gold zinc plating. We use this nut for a jam nut with our Antirock sway bar kit end link heim joints.