7 Replies Latest reply on Mar 26, 2015 2:38 PM by Frank Phelps

# Standard Tolerances for Inch and Metric

Hello all, I was wanting to know where I could find the standard drawing tolerances used in ANSI for inch and ISO for metric.  I know they vary from company to company.  Again just the standard ball park that is accepted as the norm.  Thanks in advance.

• ###### Re: Standard Tolerances for Inch and Metric

A simple "standard" is around plus or minus .003

That being said, that will just get you close on a lot of things.  There are many different kinds of tolerances and to properly design something you need to know about the different kinds tolerances you need to incorporate in your design.  There are many things like slip and press fits as well as extrusion gaps and many other factors that must be known before properly tolerancing a part.

• ###### Re: Standard Tolerances for Inch and Metric

What I have seen the most is 0-6" +/- .005, 6-12" +/-.010, 12-18" +/-.020, 18" up +/-.030 and 1 degree for angles.

• ###### Re: Standard Tolerances for Inch and Metric

Raymond - Exactly.  I was just curious about standard title block tolerances out to three decimal places.  Thanks

• ###### Re: Standard Tolerances for Inch and Metric

For most of the government prints I work with the inch tolerances are as follows:

X° = ±0°30'

X.XX = ±.03"

X.XXX = ±.010"

Chris

• ###### Re: Standard Tolerances for Inch and Metric

We use:

X° = ±.5°

X.XX = ±.01"

X.XXX = ±.005"

• ###### Re: Standard Tolerances for Inch and Metric

This is common in industry from what I've seen.  For .X, the tolerance is often .02".

As for metric, these are typically controlled by an ISO standard for tolerance ISO-8062, I think.  It provides a series of tolerances based on the size of the dimension rather than a single block based on number of decimal places.

• ###### Re: Standard Tolerances for Inch and Metric

Thanks everyone for the input.