What is true about a broken bolt that needs to be replaced?

When dealing with a broken bolt that needs replacement, it's important to understand the characteristics of bolts, particularly in relation to thread pitch, coarseness, and tensile strength.

Thread pitch refers to the distance between threads, which is crucial for ensuring that the new bolt will fit properly into the existing thread of the assembly. If the pitch and coarseness (the number of threads per unit length) are the same, it indicates that the new bolt will properly engage with the existing threads. Thus, stating that thread pitch and coarseness are the same could reflect a necessary condition for a successful replacement.

Additionally, markings on the head of a bolt often indicate its tensile strength. Different manufacturers or grades of bolts will utilize specific markings to communicate the material and strength characteristics of the bolt. If it is asserted that bolt head markings do not indicate tensile strength, it challenges the common practice in bolt manufacturing that utilizes these markings as a guide.

Therefore, both affirmations reflect requirements or common misconceptions relevant to the replacement of bolts. Understanding these attributes helps ensure that the replacement bolt will meet appropriate specifications for the application, thus supporting safe and effective repair and maintenance practices.