Premium American standard nylon insert lock nuts in Grade 12, available with UNC coarse thread and UNF fine thread, featuring white nylon ring for anti-loosening function. Standard size 9/16-20 is in full stock, with complete specifications for various American standard thread types. Made of high-quality carbon steel with fine overall processing, matched with high toughness white nylon inner ring. It delivers excellent self-locking and anti-vibration performance, effectively preventing loosening caused by vibration and pressure during long-term operation. The thread is neat and precise for smooth assembly and tight fitting. Resistant to corrosion and wear, suitable for mechanical equipment, vehicle fittings, industrial assembly and other American standard fastener matching scenarios. We provide spot supply of standard specifications and support non-standard custom processing, factory direct sales for bulk wholesale with stable quality.