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Technical Data Sheet
PartsTable / O-RING / 2306990 REV J IT NO 168
2306990 REV J IT NO 168 ✓ 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 O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER FLUOROCARBON CLASS FPM, hardness_rating: 75.0 SHORE DUROMETER A NOMINAL, outside_diameter: 1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN, center_hole_diameter: 1.706 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN, elongation_percentage: 125 MAXIMUM, cross-sectional_height: 0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-165-1978, 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
2306990 REV J IT NO 168
NSN: 5331-00-165-1978
FSC: 5331 — O-RING
CAGE: 63005 — ROLLS-ROYCE CORPORATION (USA)
SPECIFICATIONS
materialRUBBER FLUOROCARBON CLASS FPM
hardness_rating75.0 SHORE DUROMETER A NOMINAL
outside_diameter1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN
center_hole_diameter1.706 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN
elongation_percentage125 MAXIMUM
cross-sectional_height0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
NSN5331-00-165-1978
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2306990 REV J IT NO 168 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
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
•
OUTSIDE DIAMETER: 1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN
•
HARDNESS RATING: 75.0 SHORE DUROMETER A NOMINAL
•
CROSS-SECTIONAL HEIGHT: 0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.706 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN
•
ELONGATION PERCENTAGE: 125 MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER FLUOROCARBON CLASS FPM
OUTSIDE DIAMETER1.934 INCHES MINIMUM AND 1.978 INCHES MAXIMUM IN
HARDNESS RATING75.0 SHORE DUROMETER A NOMINAL
CROSS-SECTIONAL HEIGHT0.114 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.706 INCHES MINIMUM AND 1.734 INCHES MAXIMUM IN
ELONGATION PERCENTAGE125 MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
D-42042 PIECE 6Interchangeable
interchangeable cross-reference
interchangeable
AS568-924Interchangeable
interchangeable cross-reference
interchangeable
AS568-924MIL-G- 23652 TYPE 2Interchangeable
interchangeable cross-reference
interchangeable
000-605-1024Interchangeable
interchangeable cross-reference
interchangeable
D65186 AND R52998Interchangeable
interchangeable cross-reference
interchangeable
9100C2008Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2306990 REV J IT NO 168?
2306990 REV J IT NO 168 is a O-RING.
What parts can replace 2306990 REV J IT NO 168?
There are 30 known substitutes for 2306990 REV J IT NO 168: D-42042 PIECE 6, AS568-924, AS568-924MIL-G- 23652 TYPE 2 and 27 more. Substitute compatibility should be verified for your specific system.
Is 2306990 REV J IT NO 168 still available?
2306990 REV J IT NO 168 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