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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
CRTL CRITICALITY CODE JUSTIFICATION ZZZY
ADYU PERIPHERAL DIAMETER 1.096 INCHES MINIMUM AND 1.152 INCHES MAXIMUM
ADVN CROSS-SECTIONAL HEIGHT 0.045 INCHES MINIMUM AND 0.052 INCHES MAXIMUM
ZZZY REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS NAVY SPECIAL MATERIAL INDICATOR CODE CP, SPECIAL CLEAN FOR OXYGEN/NITROGEN SERVICE
MATT MATERIAL PLASTIC POLYTETRAFLUOROETHYLENE
ADYT CENTER HOLE DIAMETER 0.956 INCHES MINIMUM AND 0.958 INCHES MAXIMUM
AAGR CROSS-SECTIONAL SHAPE STYLE SINGLE TURN SPIRAL
ZZZK SPECIFICATION/STANDARD DATA 96906-MS28774L AMENDMENT 1/INACTIVE/ GOVERNMENT STANDARD
MDCL MATERIAL DOCUMENT AND CLASSIFICATION AS8791/1 ASSN STD SINGLE MATERIAL RESPONSE

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