Lower Parts

The TDP spec castle nut is a simple and robust fastener that is almost perfect for the job it’s tasked to perform. Over the years, FCD has consistently come up with two minor gripes, first is its staking notches seem rather shallow and short, second is many don’t enjoy using the castle nut’s wrench notches as serrations (fingers invariably find their way to these sharp cutouts) to rotate it towards to the endplate while installing it.

• Staking notches angle changed from 45 to 30 degrees, this results in longer (25% longer than TDP spec) and deeper notches than found on TDP castle nuts.
• Number of staking notches increased from 3 to 4, spaced equally on the CNF. The castle nut is to be staked in two places, we’re not advocating staking in more than two places, CNF’s 4 staking notches mean that, at all times, 3 will be visible and available for staking, it simply gives the user more staking location options.
• Coarse serrations on the wrench side of the nut, a single-use feature to make it easier while rotating the CNF towards the endplate.