Mark critical features
Explain which dimensions control the function of the part.

A tolerance communicates the acceptable variation in a dimension. Identify features that control fit, assembly or function, and distinguish them from less critical features. Avoid assigning tight requirements to every dimension without a functional reason. Feasibility must be reviewed against geometry, material and inspection method.
Explain which dimensions control the function of the part.
Define the reference surfaces used to measure and assemble the part.
Discuss inspection method and required reporting before ordering.
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Share your material, finish and order quantity.
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