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Technical Data Sheet
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77R12X1E — Technical Data Sheet

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— · 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: 0.7500 INCHES NOMINAL IN, overall_width: 0.4375 INCHES NOMINAL IN, load_direction: RADIAL, surface_finish: GROUND. This part is cataloged in the Federal Logistics Information System under NSN 3110-00-293-9091, 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
77R12X1E
NSN: 3110-00-293-9091
FSC: 3110
CAGE: 43334 — GENERAL MOTORS CORP DELCO MORAINE NDH DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
bore_diameter0.7500 INCHES NOMINAL IN
overall_width0.4375 INCHES NOMINAL IN
load_directionRADIAL
surface_finishGROUND
shield_quantity2
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
lubrication_materialGREASE
overall_outside_diameter1.6250 INCHES NOMINAL IN
internal_fit-up_designationSTANDARD
retainer_fabrication_methodPRESSED
NSN3110-00-293-9091
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 77R12X1E · 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
•
LOAD DIRECTION: RADIAL
•
LUBRICATION MATERIAL: GREASE
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
RETAINER FABRICATION METHOD: PRESSED
•
SHIELD QUANTITY: 2
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
BORE SHAPE: STRAIGHT
•
SURFACE FINISH: GROUND
TECHNICAL CHARACTERISTICS
LOAD DIRECTIONRADIAL
LUBRICATION MATERIALGREASE
STANDARD TOLERANCE DESIGNATIONABEC NO.1
RETAINER FABRICATION METHODPRESSED
SHIELD QUANTITY2
INTERNAL FIT-UP DESIGNATIONSTANDARD
BORE SHAPESTRAIGHT
SURFACE FINISHGROUND
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
STYLE DESIGNATORNON-LOADING GROOVE, NON-SEPARABLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 34
Z99R3XRCJ3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
R3ZZQ5A7MILG3278AInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4131103&4A1A&SInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
STD176InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
AN805-2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
R2SXA7YInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 77R12X1E?
77R12X1E is a BEARING,BALL,ANNULAR.
What parts can replace 77R12X1E?
There are 34 known substitutes for 77R12X1E: Z99R3XRCJ3, R3ZZQ5A7MILG3278A, 4131103&4A1A&S and 31 more. Substitute compatibility should be verified for your specific system.
Is 77R12X1E still available?
77R12X1E 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: September 2026