9/16"-12 Grade C Zinc Finish Steel Top Lock Nut / THREAD DIRECTION: RIGHT-HAND NUT STYLE: A17 SLOTTED, HEXAGON NUT HEIGHT: 0.621 INCHES NOMINAL THREAD SERIES: UNC THREAD QUANTITY PER INCH: 12 NOMINAL THREAD SIZE: 0.562 INCHES SPECIAL FEATURES: TRP INTERNATIONAL, INC., 3925 HAGAN STREET, SUITE 307, BLOOMINGTON, IN 47401, WWW.TRPINTL.COM 972-279-9863 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL