1/4"-20 Grade 8 Yellow Zinc Finish NE 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: 0.328 INCHES NOMINAL WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL THREAD SERIES: UNC THREAD QUANTITY PER INCH: 20 NOMINAL THREAD SIZE: 0.250 INCHES BEARING SURFACE TYPE: FLAT SPECIAL FEATURES: YELLOW ZINC FINISH NE GRADE 8 NYLON INSERT LOCK NUT MATERIAL: PLASTIC POLYAMIDE LOCKING INSERT MATERIAL: STEEL OVERALL EXCEPT INSERT SURFACE TREATMENT: ZINC OVERALL