What shape nut (besides squares) is used with machine screws?

What shape nut (besides squares) is used with machine screws?

• A. Octagonal
• B. Round
• C. Hexagonal
• D. Oblong

Answer: (C)

Hexagonal is the standard shape for nuts used with machine screws because it provides the best combination of grip, torque transfer, and ease of use. With six flat sides, a wrench or pliers can engage from multiple angles, which makes tightening and loosening easier in cramped spaces and helps apply more even torque. This shape also resists slipping and rounding off under load, and it’s simple to manufacture to precise thread standards. Round nuts are hard to grip securely, especially in tight spots. Oblong or slotted varieties exist for specific alignment needs but aren’t the typical choice for general machine screws. Octagonal nuts do occur in some applications, but hex nuts are far more common due to their practicality and compatibility with standard tools.

Hexagonal is the standard shape for nuts used with machine screws because it provides the best combination of grip, torque transfer, and ease of use. With six flat sides, a wrench or pliers can engage from multiple angles, which makes tightening and loosening easier in cramped spaces and helps apply more even torque. This shape also resists slipping and rounding off under load, and it’s simple to manufacture to precise thread standards.

Round nuts are hard to grip securely, especially in tight spots. Oblong or slotted varieties exist for specific alignment needs but aren’t the typical choice for general machine screws. Octagonal nuts do occur in some applications, but hex nuts are far more common due to their practicality and compatibility with standard tools.