# What is perpendicularity tolerance?

**Perpendicularity tolerance**symbol is shown as "⊥".

**Perpendicularity tolerance**is a three-dimensional geometric

**tolerance**that controls how much a surface, axis, or plane can deviate from a 90 degree angle or it is can be defined as a condition of a surface, median plant, or axis at 90 degree to a datum plane or axis.

In this regard, how do you define perpendicularity?

In elementary geometry, the property of being **perpendicular** (**perpendicularity**) is the relationship between two lines which meet at a right angle (90 degrees). The property extends to other related geometric objects. A line is said to be **perpendicular** to another line if the two lines intersect at a right angle.

Also, what GD&T symbol would be used to control a 90 degree relationship between two surfaces? **Surface** Perpendicularity **is** a tolerance that **controls** Perpendicularity **between two surfaces** aligned at **90 degrees** to each other. It **is controlled** by **two** parallel planes acting as a tolerane zone.

Moreover, does true position control perpendicularity?

**True Position** using features of size (MMC/LMC) However, with **true position** you can make the tolerance referenced to several datum's as opposed to just one with axis **perpendicularity**. When you callout **true position** using datums on the face, and sides of the part – **perpendicularity** is **controlled** as well.

How do you manually measure perpendicularity?

**Perpendicularity** is **measured** using a height gauge, similar to flatness, however, the gauge (or part) is locked to a 90° datum to **measure** how **perpendicular** the surface is. The entire surface has to be **measured** if it is a flat feature.