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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
81343 SOCIETY OF AUTOMOTIVE ENGINEERS INC

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 LIFT CHECK VALVE
FEAT SPECIAL FEATURES SCAEF CUT 000 CUT AT ANGLE 22-19 DEGREES;WIDTH 0.118IN
ADYT CENTER HOLE DIAMETER 1.625 INCHES NOMINAL
MDCL MATERIAL DOCUMENT AND CLASSIFICATION MIL-R-8791,-8791/1-223 MIL SPEC SINGLE MATERIAL RESPONSE
ADVN CROSS-SECTIONAL HEIGHT 0.060 INCHES NOMINAL
MATT MATERIAL PLASTIC POLYTETRAFLUOROETHYLENE
AAGR CROSS-SECTIONAL SHAPE STYLE SINGLE TURN SPIRAL
ADYU PERIPHERAL DIAMETER 1.861 INCHES NOMINAL

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