Artec 1 1/4-12 left-hand jam nut, supplied as a single reverse-thread hex nut. Sized for 1.25-12 left-hand threads, this jam nut serves as a locking fastener to secure mating hardware in left-handed applications. The description denotes its left-hand orientation explicitly, making it suitable for assemblies that use reverse-thread components where a compact locking nut is needed.
Artec Industries Jam Nut 1 1/4 In - 12Tpi Left Hand (Reverse)