Which formula is utilized to find the size of the wrench needed for a stub bolt (2H nuts)?

The formula used to determine the size of the wrench required for a stub bolt with 2H nuts incorporates the dimensions of the stub itself and considers the necessary clearance for proper fit and operation. Specifically, the correct formula involves multiplying the stub size by 1.5, which scales up its size appropriately to account for the nut's design and how the wrench needs to engage with it.

Adding 1/8 further ensures that there is sufficient margin for ease of maneuverability and access when turning the wrench. This is particularly important as a snug fit might hinder turning, so the addition of 1/8 provides that additional clearance that helps in practical application. Therefore, this comprehensive calculation ensures both that the wrench fits the nut properly and provides the necessary leverage to effectively tighten or loosen the bolt.

Understanding the physical characteristics and engineering principles behind this calculation is crucial for any pipefitter, especially when working with various bolt sizes and types. This result enhances the effectiveness and safety of the work being conducted.