What does tolerance mean in dimensions?

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Prepare for the Machinist Apprentice Level One Test. Utilize flashcards and multiple choice questions, complete with hints and explanations, to ensure readiness for your exam!

Multiple Choice

What does tolerance mean in dimensions?

Explanation:
Tolerance is the allowable variation from the nominal size. It sets a range of acceptable measurements so parts produced at different times still fit together as intended. For example, a shaft specified as 25 mm with a tolerance of +0.05 / -0.00 can measure between 25.00 and 25.05 mm, and a matching hole with a corresponding tolerance will still accept the shaft within that range, ensuring the intended fit. It’s not the exact dimension, and it’s not about the material’s stiffness or the surface finish, which are separate specifications.

Tolerance is the allowable variation from the nominal size. It sets a range of acceptable measurements so parts produced at different times still fit together as intended. For example, a shaft specified as 25 mm with a tolerance of +0.05 / -0.00 can measure between 25.00 and 25.05 mm, and a matching hole with a corresponding tolerance will still accept the shaft within that range, ensuring the intended fit. It’s not the exact dimension, and it’s not about the material’s stiffness or the surface finish, which are separate specifications.

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