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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
03950 NAVAL INVENTORY CONTROL POINT MECHAN

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
AGAV END ITEM IDENTIFICATION SEAWOLF CLASS SUBMARINE
CRTL CRITICALITY CODE JUSTIFICATION ZZZY
ZZZY REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS SPECIAL CLEANING FOR OXYGEN/NITROGEN SERVICE
ADVM CROSS-SECTIONAL THICKNESS 0.046 INCHES MINIMUM AND 0.052 INCHES MAXIMUM
ADYT CENTER HOLE DIAMETER 5.250 INCHES NOMINAL
MDCL MATERIAL DOCUMENT AND CLASSIFICATION MIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE
CXCY PART NAME ASSIGNED BY CONTROLLING AGENCY RETAINER, PACKING BACK-UP
ADVN CROSS-SECTIONAL HEIGHT 0.138 INCHES MINIMUM AND 0.156 INCHES MAXIMUM
MATT MATERIAL PLASTIC POLYTETRAFLUOROETHYLENE
ADYU PERIPHERAL DIAMETER 5.724 INCHES MINIMUM AND 5.728 INCHES MAXIMUM
AAGR CROSS-SECTIONAL SHAPE STYLE DOUBLE SPIRAL

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