What does the specification 10-32NC-1bLH indicate about the threads?

The specification 10-32NC-1bLH provides detailed information about a specific type of thread. The "32" in this specification indicates that there are 32 threads per inch. The "NC" stands for National Coarse, referring to a type of thread standard in the United States that defines coarse threads. Additionally, "1b" typically signifies the thread depth or a specific feature related to the thread form.

The suffix "LH" means that the threads are left-handed. In the context of machine screws and bolts, "internal" versus "external" specifies whether the threading is inside (like in a nut) or outside (like on a bolt). The fact that this option specifies "internal" threads is crucial because these threads are designed to fit onto a specific type of fastener or connection.

Choosing "32 threads per inch" confirms that we correctly recognize the thread count as part of the specified dimensions, along with "internal" indicating the nature of the threading. Therefore, this interpretation aligns perfectly with the specification, confirming that "32 threads per inch, Internal" is indeed the correct answer.