1/4"-20 Grade 2 Zinc Finish NE Steel Nylon Insert Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: SELF-LOCKING NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.225 INCHES MINIMUM AND 0.328 INCHES MAXIMUM INSIDE WIDTH ACROSS FLATS: 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM END ITEM IDENTIFICATION: 3655-01-556-1083, NITROGEN GENERATOR; MRAP COUGAR WIDTH ACROSS FLATS: 0.488 INCHES NOMINAL THREAD SERIES: UNEF THREAD QUANTITY PER INCH: 20 NOMINAL THREAD SIZE: 0.250 INCHES BEARING SURFACE TYPE: CHAMFERED PART NAME ASSIGNED BY CONTROLLING AGENCY: LOCK NUT, 1/4-20 SPECIAL FEATURES: DIAMETER: 0.25 IN; THICKNESS: 0.313 IN; THREAD SIZE: 20; NYLON INSERT; WRENCH SIZE: 7/16 IN MATERIAL: STEEL NUT SURFACE TREATMENT: ZINC NUT