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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
99517 VACCO INDUSTRIES DIV VACCO

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
MDCL MATERIAL DOCUMENT AND CLASSIFICATION AS8791/1-236 ASSN STD SINGLE MATERIAL RESPONSE
AGAV END ITEM IDENTIFICATION 1IN MANUAL DEPRESSURIZATION VALVE
MATT MATERIAL PLASTIC POLYTETRAFLUOROETHYLENE
AAGR CROSS-SECTIONAL SHAPE STYLE SINGLE TURN SPIRAL
ADVN CROSS-SECTIONAL HEIGHT 0.086 INCHES NOMINAL
FEAT SPECIAL FEATURES HAS SCARF CUT AT ANGLE 22-19 DEGREES
ADYU PERIPHERAL DIAMETER 3.237 INCHES NOMINAL
ADYT CENTER HOLE DIAMETER 2.873 INCHES NOMINAL

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