3/8 UNC 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 = 16 TPI

GST Incl
Excl
3/8 UNC SLOTTED NUT BL
NSLTC038B
Each
$5.1536