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A Castle nut, castellated nut, or slotted nut is normally used with a Cotter Pin to create a locking fastener assembly that cannot be loosened due to accidental vibration. It is common to see this type of nut on vehicles and machinery where vibration is frequent.
Nut Sizes
Width Across Flats
Overall Height
#10
0.375" REF
0.248" REF
1/4"
0.434" REF
0.281" REF
5/16"
0.499" REF
0.326" REF
3/8"
0.562" REF
0.410" REF
7/16"
0.686" REF
0.456" REF
1/2"
0.745" REF
0.569" REF
5/8"
0.934" REF
0.724" REF
3/4"
1.125" REF
0.820" REF
7/8"
1.126" REF
0.814" REF
1"
1.498" REF
1.005" REF
Play video
Castle Nuts - How to Install or Fit a Cotter Pin and Slotted Nut | Fasteners 101
