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Technical Data Sheet
PartsTable / O-RING / MS2778-033
MS2778-033 ✓ 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: 2.105 INCHES MINIMUM AND 2.153 INCHES MAXIMUM IN, center_hole_diameter: 1.979 INCHES MINIMUM AND 1.999 INCHES MAXIMUM IN, cross-sectional_height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-057-3133, 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
MS2778-033
NSN: 5331-01-057-3133
FSC: 5331 — O-RING
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
outside_diameter2.105 INCHES MINIMUM AND 2.153 INCHES MAXIMUM IN
center_hole_diameter1.979 INCHES MINIMUM AND 1.999 INCHES MAXIMUM IN
cross-sectional_height0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
NSN5331-01-057-3133
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS2778-033 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
•
OUTSIDE DIAMETER: 2.105 INCHES MINIMUM AND 2.153 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.979 INCHES MINIMUM AND 1.999 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER2.105 INCHES MINIMUM AND 2.153 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.979 INCHES MINIMUM AND 1.999 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
31HCS18PC145Interchangeable
interchangeable cross-reference
interchangeable
MS28775-033Interchangeable
interchangeable cross-reference
interchangeable
AS28775Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS28775Interchangeable
interchangeable cross-reference
interchangeable
M83248/2-033Interchangeable
interchangeable cross-reference
interchangeable
4400173-0330CPInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS2778-033?
MS2778-033 is a O-RING.
What parts can replace MS2778-033?
There are 12 known substitutes for MS2778-033: 31HCS18PC145, MS28775-033, AS28775 and 9 more. Substitute compatibility should be verified for your specific system.
Is MS2778-033 still available?
MS2778-033 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