View source for GDT:Modifiers Overview

{{Author Credit
|author=[[User:Admin|Admin]]
}}

{{GDT Infobox
|symbol=Modifiers Overview
|type=Modifiers
|category=Modifiers
|standard=ASME Y14.5
|author=[[User:Admin|Admin]]
|datums=Datum reference modifiers and material condition modifiers
|modifiers=MMC, LMC, RFS, projected tolerance zone, tangent plane, unequal, free state, statistical
|tolerance_zone=Modifier-dependent zone sizing and boundaries
|image=<!-- TODO: add diagram file name -->
|mistakes=Using prohibited modifiers; mixing incompatible modifiers; missing diameter where required
|related=[[GDT:Position]]
}}

== Summary ==
Modifiers refine how tolerance zones are sized, oriented, or interpreted.

== Definition ==
Modifiers are symbols or text applied to tolerance values or datum references that change how a tolerance is evaluated, such as material condition, projected tolerance zones, or profile distribution.

== When to use it ==
Use modifiers when functional requirements require bonus tolerance, constrained simulators, or special zone definitions.

== Examples ==
{{GDT Example
|title=MMC on a hole position
|body=Position with MMC allows bonus tolerance as the hole departs from MMC.
}}
{{GDT Example
|title=Projected tolerance zone
|body=Projected tolerance zone used for fastener engagement.
}}

== Common mistakes ==
* Applying diameter or projected tolerance zone to planar features of size.
* Mixing modifiers that are not allowed for the tolerance type.
* Omitting diameter on cylindrical features of size where required.

== Related pages ==
* [[GDT:Position]]
* [[GDT:Profile of a Line]]
* [[F4:Compliance Logic]]

[[Category:GDT Reference]]
[[Category:Modifiers]]