Permissible form and surface deviations

Permissible deviations in accordance with DIN 3771/4, grade N

Type of deviation	Schematic image (cross section)	Letter designation of dimension	Variety characteristic N ; d2 based on DIN 3771 part 1
			1.00-1.80	1.81-2.65	2.66-3.55	3.56-5.30	5.31-7.00
			Maximum size
Shoulder and shape deformation		е	0.08	0.10	0.13	0.15	0.15
Bead, ridge, shoulder, combined		f	0.10	0.12	0.14	0.16	0.18
Grooving		g	0.18	0.27	0.36	0.53	0.70
		h	0.08	0.08	0.10	0.10	0.13
Ridge removal area		---	Deviations from the round cross-section of an O-ring are permissible if the flat section of the surface passes  smoothly into the rounded section while maintaining d2 within its limits
Flow lines (radial expansion not permissible)		j	0.05 х d1 or J-value given below, depending on which value is higher
			1.5	1.5	6.5	6.5	6.5
		k	0.08
Indentations		I	0.60	0.80	1.00	1.30	1.70
		Depth m	0.08	0.08	0.10	0.10	0.13
Foreign bodies	---	---	Not permissible
d1=inside diameter                 d2=cross section diameter

For the most accurate application of this norm, please consult the latest edition of DIN 3771 available at the current moment.

The latter can be obtained at Beuth Verlag GmbH, Burggrafenstrasse 6, 10787 Berlin.

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