Datasheet

Technical Principles | O-Rings and Static Seals

Tolerances

ISC O-Ring are manufactured to extremely close tol-

erance levels, as specified in DIN 3771. The stated

values are only valid for ISC O-Rings made of the

standard material 72 NBR 872.

With Simrit materials having a different material base

or a different hardness, deviations from the nominal

dimensions could arise as a result of shrinkage. These,

however, are normally so small that they have no effect

on the intended ISC O-Ring function.

The inside diameter tolerances can be found in the tool

list → Fig. 16. For intermediate sizes the next higher

tolerance level is applicable.

Ring thickness d

Tolerance

Greater than Up to

1,80 ±0,08

1,80 2,65 ±0,09

2,65 3,55 ±0,10

3,55 5,30 ±0,13

5,30 7,00 ±0,15

7,00 8,00 ±0,16

8,00 10,00 ±0,18

10,00 15,00 ±0,22

Tbl. 14

0,01

0,05

0,5

1,5

1,0

0,1

Reduction in cross-section d

percent

Expansion d

in percent

Diagram 3 Reduction of the cross-sectional area with elastic expansion of the inside diameter for different d

relationships