Industrial shaft seals

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Tolerances
The bore diameter d 2 in the housing should be
machined to tolerance H8 (Table 16). The
circularity (out-of-round) should be 1 to 2
tolerance grades better than H8, depending on
the conditions.
Surface finish
The surface roughness (to ISO 4288 or DIN
4768) of the housing bore should be kept
within the limits specified to the right. These
limits apply for radial shaft seals with an
elastomeric outside diameter, or a metal case
coated with Bore-Tite, as well as the HS seals
made of elastomer.
R a 1,6 to 6,3 µm
R z 10 to 25 µm
R max 25 µm
For seals with a steel shell without Bore-Tite
or similar coating, the limits are
R a 0,8 to 3,2 µm
R z 6,3 to 10 µm
R max 10 µm
Table 16. Housing bore tolerances for large diameter seals
Housing bore for metric size seals
Housing bore for inch size seals
Nominal Housing bore Chamfer Nominal Housing bore Chamfer
diameter (ISO tolerance H8) diameter
d 2 Deviation R d 2 Deviation R
over incl. high low max over incl. high low max
mm µm mm in in in
180 250 +72 0 0,8 6 10 +0.002 –0.002 1/32
250 315 +81 0 0,8 10 20 +0.002 –0.004 1/32
315 400 +89 0 0,8 20 40 +0.002 –0.006 1/32
400 500 +97 0 0,8 40 60 +0.002 –0.010 1/32
500 630 +110 0 0,8
630 800 +125 0 0,8
800 1 000 +140 0 0,8
1 000 1 250 +165 0 0,8
1 250 1 600 +195 0 0,8
1 600 2 000 +230 0 0,8
2 000 2 500 +280 0 0,8
2 500 3 150 +330 0 0,8
3 150 4 000 +410 0 0,8
4 000 5 000 +500 0 0,8
gab.ru 84 Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22