Which item is used to properly load bolt with minimum 2 threads protruding?

• A. Nuts
• B. Non Self Locking Nuts
• C. Castellated
• D. Wing Nut

Answer: (A)

The load on a bolt is created by tightening the nut, which clamps the joined parts together. When you tighten, you want enough bolt length to still have at least two full threads visible beyond the nut. This ensures the nut isn’t bottomed out on the bolt end, keeps adequate thread engagement under load, and maintains a secure clamp. The standard nut is the item used to load the bolt in this way because it directly provides that clamping force.

The other options serve different purposes: a castellated nut is used with a cotter pin to prevent rotation, wing nuts are designed for hand tightening, and non-self-locking nuts describe a basic nut type without a locking feature. None specifically ensures the two-thread protrusion rule in the same direct way as a regular nut tightening onto a bolt.