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Technical Data Sheet
PartsTable / O-RING / 77998
77998 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The MICROCIRCUIT,LINEAR is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, body_width: 0.280 INCHES MAXIMUM IN, body_height: 0.105 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN, body_length: 0.725 INCHES MAXIMUM IN, hardness_rating: 90.0 SHORE DUROMETER A NOMINAL, outside_diameter: 0.803 INCHES MINIMUM AND 0.833 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-808-0794, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
77998
NSN: 5331-00-808-0794
FSC: 5331 — O-RING
CAGE: 25184 — PARKER HANNIFIN CORPORATION DIV O-RING DIVISION (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
body_width0.280 INCHES MAXIMUM IN
body_height0.105 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN
body_length0.725 INCHES MAXIMUM IN
hardness_rating90.0 SHORE DUROMETER A NOMINAL
outside_diameter0.803 INCHES MINIMUM AND 0.833 INCHES MAXIMUM IN
features_providedHERMETICALLY SEALED AND HIGH GAIN AND INTERNALLY COMPENSATED AND MONOLITHIC AND POSITIVE OUTPUTS
precious_materialGOLD
inclosure_materialCERAMIC AND GLASS
storage_temp_range-65.0 TO 150.0 CELSIUS DEGC
center_hole_diameter0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN
operating_temp_range-25.0 TO 85.0 CELSIUS DEGC
NSN5331-00-808-0794
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 77998 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HARDNESS RATING: 90.0 SHORE DUROMETER A NOMINAL
•
CROSS-SECTIONAL HEIGHT: 0.084 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
OUTSIDE DIAMETER: 0.803 INCHES MINIMUM AND 0.833 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING90.0 SHORE DUROMETER A NOMINAL
CROSS-SECTIONAL HEIGHT0.084 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
OUTSIDE DIAMETER0.803 INCHES MINIMUM AND 0.833 INCHES MAXIMUM IN
CENTER HOLE DIAMETER0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN
END ITEM IDENTIFICATION3990-01-444-5196 CEMENT MIXER; RG-31 MRAP; MEDIUM MINE PROTECTED VEHICLE - AMPV; MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); ARMORED MULTI-PURPOSE VEHICLE (AMPV); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE; HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 31
908-7507Interchangeable
interchangeable cross-reference
interchangeable
M15-16700PIECE2Interchangeable
interchangeable cross-reference
interchangeable
5331PL0784464Interchangeable
interchangeable cross-reference
interchangeable
MS28778-8Interchangeable
interchangeable cross-reference
interchangeable
9469127107Interchangeable
interchangeable cross-reference
interchangeable
456239Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 77998?
77998 is a MICROCIRCUIT,LINEAR.
What parts can replace 77998?
There are 31 known substitutes for 77998: 908-7507, M15-16700PIECE2, 5331PL0784464 and 28 more. Substitute compatibility should be verified for your specific system.
Is 77998 still available?
77998 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026