In bolted joints, which component should be the same material as the bolts and can be standard or locking?

In bolted joints, which component should be the same material as the bolts and can be standard or locking?

• A. Nuts
• B. Washers
• C. Caps
• D. Vent

Answer: (A)

In bolted joints, the nut is the component that should be made from the same material as the bolt. Matching materials helps ensure compatible strength, hardness, and corrosion behavior, and it keeps the torque–tension relationship predictable. It also minimizes issues like galvanic corrosion when the bolt and nut are in contact in a from-the-same-metal pair. Nuts can be standard or locking, providing either normal fastening or resistance to loosening under vibration, depending on the service conditions. The other parts—washers, caps, or vents—serve different roles and do not need to be the same material as the bolt.

In bolted joints, the nut is the component that should be made from the same material as the bolt. Matching materials helps ensure compatible strength, hardness, and corrosion behavior, and it keeps the torque–tension relationship predictable. It also minimizes issues like galvanic corrosion when the bolt and nut are in contact in a from-the-same-metal pair. Nuts can be standard or locking, providing either normal fastening or resistance to loosening under vibration, depending on the service conditions. The other parts—washers, caps, or vents—serve different roles and do not need to be the same material as the bolt.