The rubber elastomer outer covering tolerates thermal expansion as well as roughness in the housing bore. There will be no fretting corrosion. Furthermore, damage of the housing bore will be prevented when frequently replaced. This qualifies for sealing gaseous or liquid media.
Metallic casing enables easier fitting. However, this type of seal demands closer tolerances in the housing bore to ensure proper sealing on the outer covering.
Metallic casing and reinforcing cap. Sealing and mounting identical with type B. Preferentially applied in case of rougher operating conditions and where larger dimensions are utilized. Less delicate in case of incorrect mounting due to reinforcing cap.
Cross Reference
Rubber Dynamics
BS
CS
B
A
C
AS
CR/SKF
CRWA1
CRWHA1
CRW1
HMS4
CRWH1
HMSA7
NAK/TCM
TB
TA
SB
SC
SA
TC
National
47
41
48
35
45
32
NOK
TB
TA
SB
SC
SA
TC
Garlock
76
-
71,91
92
68
94
Case Material
SAE
Application
Carbon Steel
1008-1010
General Purpose
Stainless Steel
302/304
Corrosive Environments
Spring Material
SAE
Application
Carbon Steel
1070-1090
General Purpose
Stainless Steel
302/304
Corrosive Environments
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