Made from steel. Cad plated to QQ-P-416A, Type II, Class 3. AN320 castle
nuts for use with drilled-shank bolts, clevis bolts, eye bolts
and studs. The slots in the nut are for a cotter pin to lock for safety. The AN320 is a thinner castellated nut, with
half the tensile rating of the AN310 nut.
