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Tec-Ease, Inc. provides the most comprehensive GD&T training and coaching in the industry. Our GD&T courses are designed to keep the participant interested and engaged, while having fun.

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Tec-Ease, Inc. software packages are designed to help train and offer continued support to companies and employees in the industrial manufacturing field.

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A Hole’s Primary Datum Feature Does Not Have to Be Perpendicular to the Hole (#219)

(In accordance with Y14.5M-1994 standard)

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Where do these myths come from? A lot of folks think that the primary datum for a position tolerance on a hole must be the surface that is perpendicular to that hole. That might be helpful for the shop but may have nothing to do with function. The result might be a part that is easy to machine that does not function. The majority of the time …

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Back to Tips Tip added Apr 2008