General Tolerances for Chamfered Angles

General tolerances for chamfered edges are covered by ISO 2768-1:1989 and are used when the drawing does not specify an exact tolerance for the chamfer’s length or angle. Chamfers are often used to remove sharp edges, facilitate part assembly, and improve operational safety, so they generally require a less stringent level of accuracy than critical dimensions.

The tolerance classes (f, m, c, v) define how much the chamfer dimensions may deviate from the nominal value. The smaller the chamfer, the smaller the permitted deviation, while larger chamfers may allow greater variation.

This ensures that the chamfers fulfill their intended purpose without requiring unnecessarily precise machining.

General Tolerance Table for Chamfered Angles

Tolerance class		Permitted deviations within the nominal dimension range
Symbol	Description	>	0.5	3	6
		≤	3	6
f	fine		0.2	0.5	1
m	medium		0.2	0.5	1
c	coarse		0.4	1	2
v	very coarse		0.4	1	2

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