The Mittler Bros. NL-12 Left-Hand Spindle Nut is the left-hand thread spindle nut for Grand National rear hub assemblies. Left-hand spindle nuts have reverse thread direction compared to standard right-hand nuts — using the correct nut for each side is critical for safe hub retention. The NL-12 designation indicates left-hand thread.
Install and remove with the Mittler Bros. 12 GN Spindle Nut Socket (SKU 1400-013) for clean, damage-free service. For the right-hand version, see the N-12 Right-Hand Spindle Nut (SKU 1400-512). Made in the USA.
