INCH-POUND
A-A-55801A
13 February 2012
SUPERSEDING
A-A-55801
22 September 1995
COMMERCIAL ITEM DESCRIPTION
RUBBER, SILICONE; PACKING, PREFORMED (O-RING)
The General Services Administration has authorized the use of this Commercial Item Description
for all Federal Agencies.
1. SCOPE. This commercial item description (CID) covers a silicone rubber preformed packing (o-
ring), of various classes and grades.
2. CLASSIFICATION. The silicone rubber shall be of the following classes and grades as
specified. The designated grade number corresponds to the nominal Shore Durometer A hardness
value.
Class 1A Low temperature resistant
Grade 40, 50, 60, 70, and 80
Class 1B Low temperature resistant and low compression set at high temperature
Grade 40, 50, 60, 70, and 80
Class 2A High temperature resistant
Grade 25, 40, 50, 60, 70, and 80
Class 2B High temperature resistant and low compression set
Grade 25, 40, 50, 60, 70, and 80
Class 3A Low temperature, tear and flex resistant
Grade 30, 50, and 60
Class 3B Tear and flex resistant
Grade 30, 50, 60, 70, and 80
3. SALIENT CHARACTERISTICS.
3.1 Dimensional and physical requirements. Dimensional and physical requirements shall conform
to SAE AS568. O-rings not made to SAE AS568 shall be identified by a drawing number.
Comments, suggestions, or questions on this document should be addressed to Defense Supply
Center Philadelphia (DSCP), ATTN: DSCP-NASA, 700 Robbins Avenue, Philadelphia, PA
19111-5096 or e-mail to dscpg&inspecomments@dla.mil . Since contact information can
change, you may want to verify the currency of this address information using ASSIST Online
database at https://assist.daps.dla.mil .
AMSC N/A
FSC 5331
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business