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Technical Data Sheet
PartsTable / COMPONENT / R4ASS3MILG3278A
R4ASS3MILG3278A ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

The BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, bore_shape: STRAIGHT, bore_diameter: 0.2500 INCHES NOMINAL IN, overall_width: 0.2813 INCHES NOMINAL IN, load_direction: RADIAL, surface_finish: GROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-554-3921, 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
R4ASS3MILG3278A
NSN: 3110-00-554-3921
FSC: 3110
CAGE: 70854 — SCHAEFFLER AEROSPACE USA CORP DIV SCHAEFFLER AEROSPACE USA CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
bore_diameter0.2500 INCHES NOMINAL IN
overall_width0.2813 INCHES NOMINAL IN
load_directionRADIAL
surface_finishGROUND
shield_quantity2
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
lubrication_materialGREASE
overall_outside_diameter0.7500 INCHES NOMINAL IN
internal_fit-up_designationSTANDARD
retainer_fabrication_methodPRESSED
NSN3110-00-554-3921
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: R4ASS3MILG3278A · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SHIELD QUANTITY: 2
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.5
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
SURFACE FINISH: GROUND
•
RETAINER FABRICATION METHOD: PRESSED
•
LOAD DIRECTION: RADIAL
•
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL WIDTH0.2813 INCHES NOMINAL IN
SHIELD QUANTITY2
STANDARD TOLERANCE DESIGNATIONABEC NO.5
INTERNAL FIT-UP DESIGNATIONSTANDARD
SURFACE FINISHGROUND
RETAINER FABRICATION METHODPRESSED
LOAD DIRECTIONRADIAL
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
BORE SHAPESTRAIGHT
LUBRICATION MATERIALGREASE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
18730/F16KA-1Interchangeable
interchangeable cross-reference
interchangeable
88B8799-18Interchangeable
interchangeable cross-reference
interchangeable
30-03021Interchangeable
interchangeable cross-reference
interchangeable
RS77R4ACZD5MILG3278Interchangeable
Same NIIN cross-reference
interchangeable
9004138Interchangeable
Same NIIN cross-reference
interchangeable
Z99R4AXR5EInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R4ASS3MILG3278A?
R4ASS3MILG3278A is a BEARING,BALL,ANNULAR.
What parts can replace R4ASS3MILG3278A?
There are 7 known substitutes for R4ASS3MILG3278A: 18730/F16KA-1, 88B8799-18, 30-03021 and 4 more. Substitute compatibility should be verified for your specific system.
Is R4ASS3MILG3278A still available?
R4ASS3MILG3278A 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