5/8 UNF SLOTTED NUT BL

Slotted nuts are used together with a bolt and a cotter pin to create a secure nut in place so that it cannot be tightened or loosened. In Metric these are known as Castle nuts.
Thread = 18 TPI

GST Incl
Excl
5/8 UNF SLOTTED NUT BL
NSLTF058B
Each
$6.4033