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PartsTable / COMPONENT / R4B2ZYMILG3278A
R4B2ZYMILG3278A ✓ 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 OUTER RING, bore_shape: STRAIGHT, bore_diameter: 4.00 MILLIMETERS NOMINAL MM, overall_width: 5.0 MILLIMETERS NOMINAL MM, load_direction: RADIAL, surface_finish: GROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-554-3261, 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
R4B2ZYMILG3278A
NSN: 3110-00-554-3261
FSC: 3110
CAGE: 52676 — SKF USA INC. (USA)
SPECIFICATIONS
materialSTEEL OUTER RING
bore_shapeSTRAIGHT
bore_diameter4.00 MILLIMETERS NOMINAL MM
overall_width5.0 MILLIMETERS NOMINAL MM
load_directionRADIAL
surface_finishGROUND
shield_quantity2
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
lubrication_materialGREASE
overall_outside_diameter16.00 MILLIMETERS NOMINAL MM
internal_fit-up_designationSTANDARD
retainer_fabrication_methodPRESSED
NSN3110-00-554-3261
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: R4B2ZYMILG3278A · 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
•
BORE DIAMETER: 4.00 MILLIMETERS NOMINAL MM
•
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
•
LOAD DIRECTION: RADIAL
•
LUBRICATION MATERIAL: GREASE
•
SURFACE FINISH: GROUND
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
BORE SHAPE: STRAIGHT
•
RETAINER FABRICATION METHOD: PRESSED
TECHNICAL CHARACTERISTICS (FLIS)
BORE DIAMETER4.00 MILLIMETERS NOMINAL MM
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
LOAD DIRECTIONRADIAL
LUBRICATION MATERIALGREASE
SURFACE FINISHGROUND
STANDARD TOLERANCE DESIGNATIONABEC NO.1
BORE SHAPESTRAIGHT
RETAINER FABRICATION METHODPRESSED
INTERNAL FIT-UP DESIGNATIONSTANDARD
SHIELD QUANTITY2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
77037X1MILL7711Interchangeable
interchangeable cross-reference
interchangeable
37KDDMILL7711Interchangeable
interchangeable cross-reference
interchangeable
C97PPTFMILL7711Interchangeable
interchangeable cross-reference
interchangeable
34FFB106A023F75B00000Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R4B2ZYMILG3278A?
R4B2ZYMILG3278A is a BEARING,BALL,ANNULAR.
What parts can replace R4B2ZYMILG3278A?
There are 4 known substitutes for R4B2ZYMILG3278A: 77037X1MILL7711, 37KDDMILL7711, C97PPTFMILL7711 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R4B2ZYMILG3278A?
R4B2ZYMILG3278A is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-554-3261. 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