What percentage of nickel is contained in SAE 2340 shafting?

SAE 2340 is a steel specification that is part of the alloy steel family. It is known for its combination of strength and toughness, which is beneficial for various applications, including shafting. The composition of SAE 2340 typically includes nickel as one of its alloying elements.

The correct option states that SAE 2340 contains nickel in the range of 3.25% to 3.75%. This range is characteristic of this alloy, providing it with enhanced properties such as improved hardenability and resistance to impact. Nickel is crucial in developing these attributes, especially in applications requiring high strength and toughness under stress.

In contrast, the other responses either specify a percentage that goes beyond or below this typical range, failing to accurately reflect the composition of SAE 2340. By recognizing the correct range, one can appreciate the role of nickel in improving the mechanical properties of the alloy, making this understanding vital for applications and specifications in machine design.