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Technical Data Sheet
PartsTable / COMPONENT / 77R4X1921
77R4X1921 ✓ 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: 0.1960 INCHES NOMINAL IN, load_direction: RADIAL, surface_finish: GROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-555-5536, 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
77R4X1921
NSN: 3110-00-555-5536
FSC: 3110
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
bore_diameter0.2500 INCHES NOMINAL IN
overall_width0.1960 INCHES NOMINAL IN
load_directionRADIAL
surface_finishGROUND
shield_quantity2
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
lubrication_materialGREASE
overall_outside_diameter0.6250 INCHES NOMINAL IN
internal_fit-up_designationSTANDARD
retainer_fabrication_methodPRESSED
NSN3110-00-555-5536
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 77R4X1921 · 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: GREASE
•
SHIELD QUANTITY: 2
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
SURFACE FINISH: GROUND
•
RETAINER FABRICATION METHOD: PRESSED
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
BORE SHAPE: STRAIGHT
•
LOAD DIRECTION: RADIAL
TECHNICAL CHARACTERISTICS (FLIS)
LUBRICATION MATERIALGREASE
SHIELD QUANTITY2
INTERNAL FIT-UP DESIGNATIONSTANDARD
SURFACE FINISHGROUND
RETAINER FABRICATION METHODPRESSED
STANDARD TOLERANCE DESIGNATIONABEC NO.1
BORE SHAPESTRAIGHT
LOAD DIRECTIONRADIAL
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-81322 MIL SPEC SINGLE MATERIAL RESPONSE
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 35
Z99R3XRCJ3Interchangeable
interchangeable cross-reference
interchangeable
R3ZZQ5A7MILG3278AInterchangeable
interchangeable cross-reference
interchangeable
4131103&4A1A&SInterchangeable
interchangeable cross-reference
interchangeable
R2SXA7YInterchangeable
interchangeable cross-reference
interchangeable
R2MR3Interchangeable
interchangeable cross-reference
interchangeable
FF-B-2844/02Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 77R4X1921?
77R4X1921 is a BEARING,BALL,ANNULAR.
What parts can replace 77R4X1921?
There are 35 known substitutes for 77R4X1921: Z99R3XRCJ3, R3ZZQ5A7MILG3278A, 4131103&4A1A&S and 32 more. Substitute compatibility should be verified for your specific system.
Is 77R4X1921 still available?
77R4X1921 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