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Technical Data Sheet
PartsTable / COMPONENT / 77R4A
77R4A ✓ 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 CORROSION RESISTING OVERALL, bore_shape: STRAIGHT, bore_diameter: 0.2500 INCHES NOMINAL IN, overall_width: 0.2812 INCHES NOMINAL IN, 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 3110-01-049-6272, 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
77R4A
NSN: 3110-01-049-6272
FSC: 3110
CAGE: 43334 — GENERAL MOTORS CORP DELCO MORAINE NDH DIV (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
bore_shapeSTRAIGHT
bore_diameter0.2500 INCHES NOMINAL IN
overall_width0.2812 INCHES NOMINAL IN
load_directionRADIAL
surface_finishGROUND
shield_quantity2
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
lubrication_materialGREASE
overall_outside_diameter0.7500 INCHES NOMINAL IN
retainer_fabrication_methodPRESSED
standard_tolerance_designationABEC NO.1
NSN3110-01-049-6272
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 77R4A · 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
•
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
•
OVERALL OUTSIDE DIAMETER: 0.7500 INCHES NOMINAL IN
•
SHIELD QUANTITY: 2
•
SURFACE FINISH: GROUND
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
INTERNAL FIT-UP CONTACT ANGULAR DIRECTION: PRIMARILY RADIAL
•
BORE SHAPE: STRAIGHT
•
LOAD DIRECTION: RADIAL
TECHNICAL CHARACTERISTICS (FLIS)
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
OVERALL OUTSIDE DIAMETER0.7500 INCHES NOMINAL IN
SHIELD QUANTITY2
SURFACE FINISHGROUND
STANDARD TOLERANCE DESIGNATIONABEC NO.1
INTERNAL FIT-UP CONTACT ANGULAR DIRECTIONPRIMARILY RADIAL
BORE SHAPESTRAIGHT
LOAD DIRECTIONRADIAL
RETAINER FABRICATION METHODPRESSED
LUBRICATION MATERIALGREASE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
19592Interchangeable
interchangeable cross-reference
interchangeable
6157-P-17-13Interchangeable
interchangeable cross-reference
interchangeable
S1KDDFS381Interchangeable
interchangeable cross-reference
interchangeable
X-74222Interchangeable
interchangeable cross-reference
interchangeable
X74222 PIECE 78Interchangeable
interchangeable cross-reference
interchangeable
932892-1BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 77R4A?
77R4A is a BEARING,BALL,ANNULAR.
What parts can replace 77R4A?
There are 13 known substitutes for 77R4A: 19592, 6157-P-17-13, S1KDDFS381 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 77R4A?
77R4A is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-01-049-6272. 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