General Tolerances for Angular Dimensions

Angular dimensions refer to the angles between the different surfaces or edges of a part, such as a 90° angle. If no individual tolerances are specified on the drawing, the general tolerances in accordance with ISO 2768-1:1989 apply.

The standard defines how much an angle may deviate from its nominal value in different accuracy classes (f, m, c, v). For small dimensions, a greater deviation is permitted in degrees, but in practice the angle remains sufficiently accurate to ensure that the parts fit together. For larger dimensions, the permitted angular deviation is proportionally smaller, because even a small angular error could otherwise cause significant deviations at the ends of the part.

General tolerances for angular dimensions simplify design and manufacturing and ensure that parts fit together correctly without requiring every angle to be toleranced separately.

General Tolerance Table for Angular Dimensions

Tolerance class		Permitted deviations for the shorter side of the angle concerned over the length range (mm)
Symbol	Description	>		10	50	120	400
		≤	10	50	120	400
f	fine		1°	0°30´	0°20´	0°10´	0°5´
m	medium		1°	0°30´	0°20´	0°10´	0°5´
c	coarse		1°30´	1°	0°30´	0°15´	0°10´
v	very coarse		3°	2°	1°	0°30´	0°20´

The values in the table are given in millimeters (mm)