TYP Typical (TYP)
Typical (TYP) · Anotaciones de plano · ISO 1101 + ASME Y14.5
Example in plan
How to interpret it
On the drawing, “R2 TYP at all visible corners” states a typical (typ) requirement.
What controls
An abbreviation indicating that the dimension or detail is repeated identically at all equivalent locations on the part, without needing to dimension them one by one. It is a drafting convention to save dimensions, not a different requirement: each of those locations must meet exactly the same as the one dimensioned, with the same tolerance. The practical problem is that it does not say how many there are: the quantity has to be worked out from the views, and that is where errors happen.
How to verify
All affected locations are verified, not just the dimensioned one, with the same instrument and the same tolerance. In the inspection report it is advisable to break them out as separate characteristics so it is clear they were all checked. If the number of locations is large, the control plan may define sampling, but that is a control plan decision, not a consequence of the abbreviation.
Common mistakes when interpreting it
- Interpreting it as “on all edges” or “on the whole part” without counting in the views.
- Applying it to locations that are not truly equivalent to the dimensioned one.
- Inspecting only the detail that carries the dimension and accepting the others without checking.
How to get it in the workshop / if it comes out of tolerance
Before programming, count in every view how many locations it affects and write it down; do not assume it means “everywhere” without checking. When the drawing allows, a callout with an explicit quantity is preferable, as it leaves no room for interpretation. If there is doubt about the scope, ask before manufacturing: repeating too many times is usually irreversible.
If a discrepancy appears between what was made and what was expected, the first thing is to review the count of affected locations in all views, which is the most common failure. If the drawing is ambiguous, ask for it to be replaced by a callout with a quantity. And if a repeated detail turns out to be impossible at one of the locations due to interference, flag it: the abbreviation was probably applied without checking every location.
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