How far do bolts on a flange extend through the nut?

The correct answer is based on standard practices regarding how bolts and nuts interact in a bolted joint, particularly when it comes to flanged connections. Bolts are designed to extend through the nut a distance that allows for adequate engagement while also ensuring that the bolt is securely fastened.

When a bolt extends 1 or 2 threads through the nut, this provides enough thread engagement to ensure a strong connection without compromising the integrity of the bolt or joint. If the bolts extend too far beyond the nut, it can lead to issues such as cross-threading or uneven loading, which may not provide the necessary strength for the application.

The other options imply either a greater distance or an incomplete engagement of the threads which may not be standard or preferred practice in many applications involving flanges. It is crucial to adhere to these dimensional standards for safety and performance in a water works system, ensuring reliability and preventing leaks or failures in the connection.