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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
ADVM CROSS-SECTIONAL THICKNESS 0.025 INCHES MINIMUM AND 0.029 INCHES MAXIMUM
CRTL CRITICALITY CODE JUSTIFICATION ZZZY
ADYT CENTER HOLE DIAMETER 0.750 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
ADYU PERIPHERAL DIAMETER 0.990 INCHES MINIMUM AND 0.994 INCHES MAXIMUM
ZZZY REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS SPECIAL CLEANING,PACKAGING,AND MARKING IAW MIL-STD-1330D
AAGR CROSS-SECTIONAL SHAPE STYLE DOUBLE SPIRAL

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