1/2"-13 Grade 18-8 NE Stainless Steel Nylon Insert Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM END ITEM IDENTIFICATION: 4220-01-617-9406 WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 13 NOMINAL THREAD SIZE: 0.500 INCHES BEARING SURFACE TYPE: FLAT PART NAME ASSIGNED BY CONTROLLING AGENCY: NE NYLON INSERT LOCKNUT MATERIAL: STEEL COMP 302 OVERALL