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Part Number

Part Number:
NSN:
NIIN:
Item Name:
BACK-UP RING , PREFORMED PACKING

Definition:

A CIRCULAR SHAPED ITEM WITH AN APERTURE MANUFACTURED TO PREDETERMINED DIMENSIONS, CONSTRUCTED WITH A RECTANGULAR CROSS SECTION THAT MAY BE SOLID, WITH JOINT, OR IN A HELICAL FORM THAT FACILITATES SPIRAL WRAP INSTALLATION. IT PREVENTS SEAL EXTRUSION UNDER PRESSURE AND IS DESIGNED TO FIT ON THE DOWN-PRESSURE SIDE OF A GLAND GROOVE WITH A PACKING, PREFORMED OR O-RING.

CAGE Information

Code Company
96169 ELECTRIC BOAT CORPORATION

Federal Supply Class

Title

PACKING AND GASKET MATERIALS

Inclusions:

INCLUDES GENERAL PURPOSE OIL GREASE, AIR, LIQUID, GAS, AND CHEMICAL SEALS; OAKUM; PREFABRICATED GASKETS AND SEALS DESIGNED FOR A SINGLE SPECIFIC APPLICATION.

Exclusions:

EXCLUDES O-RINGS (FSC 5331); BULK MATERIAL ITEMS, SUCH AS; RUBBER, CORK, AND ASBESTOS SHEETS AND STRIPS (FSG 93); LIQUID GASKET MATERIALS (RTV, PERMATEX, ETC.) (FSG 80); RFI AND EMI SEALS AND GASKETS (FSC 5999), AND ALL SEAL RETAINERS.

Characteristics (Decoded)

MRC Requirements Statement Clear Text Reply
ADVM CROSS-SECTIONAL THICKNESS 0.025 INCHES MINIMUM AND 0.029 INCHES MAXIMUM
CRTL CRITICALITY CODE JUSTIFICATION ZZZY
ADYT CENTER HOLE DIAMETER 2.875 INCHES NOMINAL
MDCL MATERIAL DOCUMENT AND CLASSIFICATION MIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE
ADVN CROSS-SECTIONAL HEIGHT 0.050 INCHES MINIMUM AND 0.058 INCHES MAXIMUM
MATT MATERIAL PLASTIC POLYTETRAFLUOROETHYLENE
AGAV END ITEM IDENTIFICATION SEAWOLF CLASS SSN
ZZZY REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS SPECIAL CLEANING,PACKAGING,AND MARKING IAW MIL-STD-1330D
ADYU PERIPHERAL DIAMETER 3.113 INCHES MINIMUM AND 3.117 INCHES MAXIMUM
AAGR CROSS-SECTIONAL SHAPE STYLE DOUBLE SPIRAL

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