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Technical Data Sheet
PartsTable / O-RING / 500491-2
500491-2 ✓ 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 INSULATOR,BUSHING is a the manufacturer industrial component. Key specifications include material: GLASS AND PLASTIC MELAMINE OVERALL, corner_shape: SQUARE ALL CORNERS, overall_height: 1.250 INCHES NOMINAL IN, overall_length: 0.7400 INCHES MINIMUM AND 0.7600 INCHES MAXIMUM IN, hardness_rating: 65.0 SHORE DUROMETER A NOMINAL, inside_diameter: 0.328 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-582-7475, 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
500491-2
NSN: 5331-00-582-7475
FSC: 5331 — O-RING
CAGE: FB459 — EMBRAER AVIATION INTERNATIONAL (FRA)
SPECIFICATIONS
materialGLASS AND PLASTIC MELAMINE OVERALL
corner_shapeSQUARE ALL CORNERS
overall_height1.250 INCHES NOMINAL IN
overall_length0.7400 INCHES MINIMUM AND 0.7600 INCHES MAXIMUM IN
hardness_rating65.0 SHORE DUROMETER A NOMINAL
inside_diameter0.328 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
outside_diameter0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
style_designatorCYLINDRICAL
end_configurationBOTH ENDS SQUARED
surface_treatmentCADMIUM OVERALL
body_inside_diameter0.5120 INCHES MINIMUM AND 0.5160 INCHES MAXIMUM IN
center_hole_diameter0.463 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
NSN5331-00-582-7475
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 500491-2 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
•
CENTER HOLE DIAMETER: 0.463 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
•
ELONGATION PERCENTAGE: 200 MAXIMUM
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
OUTSIDE DIAMETER: 0.624 INCHES NOMINAL IN
•
HARDNESS RATING: 65.0 SHORE DUROMETER A NOMINAL
•
CROSS-SECTIONAL HEIGHT: 0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER0.463 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
ELONGATION PERCENTAGE200 MAXIMUM
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
OUTSIDE DIAMETER0.624 INCHES NOMINAL IN
HARDNESS RATING65.0 SHORE DUROMETER A NOMINAL
CROSS-SECTIONAL HEIGHT0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
8526718Interchangeable
interchangeable cross-reference
interchangeable
50049-12Interchangeable
interchangeable cross-reference
interchangeable
306118Interchangeable
interchangeable cross-reference
interchangeable
4192800-90Interchangeable
interchangeable cross-reference
interchangeable
151-041Interchangeable
interchangeable cross-reference
interchangeable
1855467-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 500491-2?
500491-2 is a INSULATOR,BUSHING.
What parts can replace 500491-2?
There are 14 known substitutes for 500491-2: 8526718, 50049-12, 306118 and 11 more. Substitute compatibility should be verified for your specific system.
Is 500491-2 still available?
500491-2 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