Final answer:
The maximum lack of thread engagement on a flange bolt up depends on factors like bolt size, flange material, and application. A general guideline is the '1x diameter rule' which recommends a minimum of one full thread protrusion beyond the nut. Adequate thread engagement is important for joint integrity and to prevent issues like bolt fatigue or thread stripping.
Step-by-step explanation:
The maximum lack of thread engagement that is acceptable on a flange bolt up depends on several factors, such as the size of the bolt, the material of the flange, and the specific application. However, as a general rule, it is important to ensure that there is enough thread engagement to provide sufficient strength and prevent the bolt from loosening or failing. The International Organization for Standardization (ISO) recommends a minimum of one full thread protrusion beyond the nut, which is known as the '1x diameter rule'.
For example, if the diameter of the bolt is 10 millimeters, the minimum acceptable thread engagement would be 10 millimeters. It is important to note that this is a minimum requirement, and it is often advisable to have a longer thread engagement for added safety and reliability.
Having adequate thread engagement is crucial in order to ensure the integrity of the bolted joint and prevent potential issues such as bolt fatigue, loss of preload, or thread stripping.