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MIL-R-25988/4 1971 Edition, November 23, 1971
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RUBBER, FLUOROSILICONE ELASTOMER, OIL- AND FUEL-RESISTANT, O-RINGS, CLASS 1, GRADE 80
Includes all amendments and changes through Notice 4, August 11, 2006
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The complete requirements for procuring the o-ring described herein shall consist of this document and the issue in effect of Specification MIL-R-25988 (USAF)

Purpose. The purpose of this specification sheet is to set up a standardized part numbering system for o-rings procured to MIL-R-25988, Class 1, Grade 80.

Part Numbers. When this document is used for procurement of o-rings, part numbers shall consist of the following:

1. The letter M and the specification sheet number.

2. A dash followed by the appropriate dash number from the listing of o-ring sizes (see MIL-R-25988/1(USAF)).
               Example 1                     Example 2

             M25988/4-220                  M25988/4-335




See MIL-R-25988/1(USAF) for o-ring drawing and dimensions.