Intro to Millwright Practice Exam

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What does 'UNC' stand for in bolt designation?

  1. Unified National Coarse

  2. Unified National Class

  3. Uniform National Coarse

  4. Uniform National Class

The correct answer is: Unified National Coarse

The designation 'UNC' stands for Unified National Coarse. This term is used to describe a specific series of thread standards for bolts and screws that are standardized in terms of their pitch and diameter. The 'Unified' aspect of the designation indicates that the standard is used in both the United States and Canada, providing a common framework for fasteners. The 'National' portion refers to the recognition that this standard was established nationally within these countries. Lastly, 'Coarse' describes the type of thread, which has a larger pitch when compared to fine threads, making it more suitable for general use where quick assembly is needed. This classification is essential for millwrights and other professionals, as it ensures compatibility and proper fit when selecting and using fasteners in assemblies.

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