PartsTable
Technical Data Sheet
PartsTable / O-RING / 391-2881-261
391-2881-261 ✓ 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 BUTADIENE-ACRYLONITRILE CLASS NBR, outside_diameter: 1.056 INCHES MINIMUM AND 1.092 INCHES MAXIMUM IN, center_hole_diameter: 0.786 INCHES MINIMUM AND 0.806 INCHES MAXIMUM IN, cross-sectional_height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-559-6182, 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
391-2881-261
NSN: 5331-00-559-6182
FSC: 5331 — O-RING
CAGE: 13829 — PARKER HANNIFIN CORPORATION DIV CYLINDER DIVISION (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
outside_diameter1.056 INCHES MINIMUM AND 1.092 INCHES MAXIMUM IN
center_hole_diameter0.786 INCHES MINIMUM AND 0.806 INCHES MAXIMUM IN
cross-sectional_height0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
NSN5331-00-559-6182
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 391-2881-261 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: 0.786 INCHES MINIMUM AND 0.806 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.056 INCHES MINIMUM AND 1.092 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER0.786 INCHES MINIMUM AND 0.806 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.056 INCHES MINIMUM AND 1.092 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
131416Interchangeable
interchangeable cross-reference
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91304726Interchangeable
interchangeable cross-reference
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113-116Interchangeable
interchangeable cross-reference
interchangeable
7260009-2Interchangeable
interchangeable cross-reference
interchangeable
21845-1Interchangeable
interchangeable cross-reference
interchangeable
20-40201Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 391-2881-261?
391-2881-261 is a O-RING.
What parts can replace 391-2881-261?
There are 26 known substitutes for 391-2881-261: 131416, 91304726, 113-116 and 23 more. Substitute compatibility should be verified for your specific system.
Is 391-2881-261 still available?
391-2881-261 is currently cancelled.
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Last verified: July 2026