Intro to Millwright Practice Exam

Question: 1 / 400

Which class of fit is considered too tight for hand assembly but loose enough for assembly using a wrench?

Class 1 Fit

Class 2 Fit

Class 3 Fit

Class 3 Fit is defined as the type of fit that provides a level of clearance suitable for assembly using tools like wrenches, while being tight enough to prevent free movement without additional force. This class of fit typically balances between snug assembly and the ease of use with tools, making it ideal for applications where a firm connection is necessary but manual assembly without powered tools is impractical.

In mechanical assemblies, a Class 3 Fit ensures that parts can be assembled without excessive force but still maintain a level of contact that prevents play or wobble. This is particularly useful in environments where components might experience vibration or require a secure alignment, allowing for both reliability and ease when tightening with a wrench.

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Class 4 Fit

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