What is the minimum pitch diameter for an external thread 7/16-14 UNC - 2A?

What is the minimum pitch diameter for an external thread 7/16-14 UNC - 2A?

• A. 0.2500
• B. 0.3850
• C. 0.3000
• D. 0.4000

Answer: (B)

The minimum pitch diameter for an external thread is determined based on standards provided by the Unified National Coarse (UNC) thread specification. For a thread designated as 7/16-14 UNC, the first part (7/16) refers to the nominal diameter of the screw, and the second part (14) indicates that the screw has 14 threads per inch. To find the minimum pitch diameter for an external UNC thread, one can consult the Unified Thread Standard (UTS) tables, which provide the values based on nominal diameter and threads per inch. For a 7/16 diameter screw with 14 threads per inch, the minimum pitch diameter is indeed 0.3850 inches. This value is critical in applications where proper fit and strength of the threaded connection are necessary. Using the correct pitch diameter helps ensure that the fitting works effectively, preventing issues such as thread stripping or weakened connections. Other choices do not align with the standardized measurements for this specific external thread. The sizes presented in those choices do not comply with the specifications outlined for a 7/16-14 UNC thread, affirming that 0.3850 inches is indeed the correct and minimum required pitch diameter for this type of thread.

The minimum pitch diameter for an external thread is determined based on standards provided by the Unified National Coarse (UNC) thread specification. For a thread designated as 7/16-14 UNC, the first part (7/16) refers to the nominal diameter of the screw, and the second part (14) indicates that the screw has 14 threads per inch.

To find the minimum pitch diameter for an external UNC thread, one can consult the Unified Thread Standard (UTS) tables, which provide the values based on nominal diameter and threads per inch. For a 7/16 diameter screw with 14 threads per inch, the minimum pitch diameter is indeed 0.3850 inches.

This value is critical in applications where proper fit and strength of the threaded connection are necessary. Using the correct pitch diameter helps ensure that the fitting works effectively, preventing issues such as thread stripping or weakened connections.

Other choices do not align with the standardized measurements for this specific external thread. The sizes presented in those choices do not comply with the specifications outlined for a 7/16-14 UNC thread, affirming that 0.3850 inches is indeed the correct and minimum required pitch diameter for this type of thread.