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Technical Data Sheet
PartsTable / O-RING / X2878
X2878 ✓ 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 SCREW,ASSEMBLED WASHER is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, head_style: FILLISTER, head_height: 0.118 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.292 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, thread_length: 0.290 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-043-3988, 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
X2878
NSN: 5331-00-043-3988
FSC: 5331 — O-RING
CAGE: 03092 — AMERICAN TRACTOR EQUIPMENT CORP (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
head_styleFILLISTER
head_height0.118 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.292 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
thread_length0.290 INCHES MAXIMUM IN
fastener_length0.281 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER
washer_quantity1
special_featuresSTYLE DESIGNATOR:NO.60 IRREGULAR SHAPE FROM FIIG A03200
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
NSN5331-00-043-3988
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: X2878 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 SYNTHETIC
•
CROSS-SECTIONAL HEIGHT: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER SYNTHETIC
CROSS-SECTIONAL HEIGHT0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
7706796Interchangeable
interchangeable cross-reference
interchangeable
673273Interchangeable
interchangeable cross-reference
interchangeable
X2878Interchangeable
interchangeable cross-reference
interchangeable
2878Interchangeable
interchangeable cross-reference
interchangeable
KD31821Interchangeable
interchangeable cross-reference
interchangeable
31821Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X2878?
X2878 is a SCREW,ASSEMBLED WASHER.
What parts can replace X2878?
There are 18 known substitutes for X2878: 7706796, 673273, X2878 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for X2878?
X2878 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-043-3988. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026