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Technical Data Sheet
PartsTable / COMPONENT / 278308R1
278308R1 ✓ 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 GASKET is a the manufacturer industrial component. Key specifications include material: ASBESTOS AND RUBBER POLYISOPRENE NATURAL CLASS NR OR RUBBER POLYISOPRENE SYNTHETIC CLASS IR OVERALL, aperture_width: 4.490 INCHES NOMINAL IN, aperture_length: 28.240 INCHES NOMINAL IN, inside_corner_radius: 0.810 INCHES NOMINAL IN, bearing_surface_width: 0.380 INCHES NOMINAL IN, outside_corner_radius: 1.190 INCHES NOMINAL 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 5330-00-770-5940, 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
278308R1
NSN: 5330-00-770-5940
FSC: 5330
CAGE: 31007 — NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR (USA)
SPECIFICATIONS
materialASBESTOS AND RUBBER POLYISOPRENE NATURAL CLASS NR OR RUBBER POLYISOPRENE SYNTHETIC CLASS IR OVERALL
aperture_width4.490 INCHES NOMINAL IN
aperture_length28.240 INCHES NOMINAL IN
inside_corner_radius0.810 INCHES NOMINAL IN
bearing_surface_width0.380 INCHES NOMINAL IN
outside_corner_radius1.190 INCHES NOMINAL IN
cross-sectional_thickness0.062 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMIL-G-12803,+1162-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
NSN5330-00-770-5940
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 278308R1 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
•
APERTURE WIDTH: 4.490 INCHES NOMINAL IN
•
APERTURE LENGTH: 28.240 INCHES NOMINAL IN
•
OUTSIDE CORNER RADIUS: 1.190 INCHES NOMINAL IN
•
CROSS-SECTIONAL THICKNESS: 0.062 INCHES NOMINAL IN
•
INSIDE CORNER RADIUS: 0.810 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
MATERIAL: ASBESTOS AND RUBBER POLYISOPRENE NATURAL CLASS NR OR RUBBER POLYISOPRENE SYNTHETIC CLASS IR OVERALL
•
BEARING SURFACE WIDTH: 0.380 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
APERTURE WIDTH4.490 INCHES NOMINAL IN
APERTURE LENGTH28.240 INCHES NOMINAL IN
OUTSIDE CORNER RADIUS1.190 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.062 INCHES NOMINAL IN
INSIDE CORNER RADIUS0.810 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
MATERIALASBESTOS AND RUBBER POLYISOPRENE NATURAL CLASS NR OR RUBBER POLYISOPRENE SYNTHETIC CLASS IR OVERALL
BEARING SURFACE WIDTH0.380 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-12803,+1162-A MIL SPEC ALL MATERIAL RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
13891AInterchangeable
interchangeable cross-reference
interchangeable
5746911Interchangeable
interchangeable cross-reference
interchangeable
88505X1CInterchangeable
interchangeable cross-reference
interchangeable
278308R1Interchangeable
interchangeable cross-reference
interchangeable
5999-03-L00-8567Interchangeable
interchangeable cross-reference
interchangeable
88505Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 278308R1?
278308R1 is a GASKET.
What parts can replace 278308R1?
There are 7 known substitutes for 278308R1: 13891A, 5746911, 88505X1C and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 278308R1?
278308R1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-770-5940. 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