Slotted Hex Nuts & Castle Nuts

Castle Hex Nuts are similar to Slotted Hex Nuts except the slots are cut into cylindrical portions that are equal in length to the slot depth and slightly smaller in diameter than the hex width. They are used with a cotter pin and drilled fastener to prevent loosening. The slotted and castle styles are both interchangeable with the slotted design now the preferred style.

Slotted Hex Nut & Castle Nut Resources