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Technical Data Sheet
PartsTable / COMPONENT / S12RFFMILG3278A
S12RFFMILG3278A ✓ 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: 1.2500 INCHES NOMINAL IN, overall_width: 0.5000 INCHES NOMINAL IN, load_direction: RADIAL, surface_finish: GROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-554-3311, 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
S12RFFMILG3278A
NSN: 3110-00-554-3311
FSC: 3110
CAGE: 21760 — SCHATZ BEARING CORPORATION DBA SCHATZ BEARING CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
bore_diameter1.2500 INCHES NOMINAL IN
overall_width0.5000 INCHES NOMINAL IN
load_directionRADIAL
surface_finishGROUND
shield_quantity2
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
lubrication_materialGREASE
overall_outside_diameter2.2500 INCHES NOMINAL IN
internal_fit-up_designationSTANDARD
retainer_fabrication_methodPRESSED
NSN3110-00-554-3311
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: S12RFFMILG3278A · 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
•
SURFACE FINISH: GROUND
•
RETAINER FABRICATION METHOD: PRESSED
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
•
LUBRICATION MATERIAL: GREASE
•
BORE SHAPE: STRAIGHT
•
LOAD DIRECTION: RADIAL
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE FINISHGROUND
RETAINER FABRICATION METHODPRESSED
STANDARD TOLERANCE DESIGNATIONABEC NO.1
INTERNAL FIT-UP DESIGNATIONSTANDARD
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
LUBRICATION MATERIALGREASE
BORE SHAPESTRAIGHT
LOAD DIRECTIONRADIAL
SHIELD QUANTITY2
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
R24-FFInterchangeable
interchangeable cross-reference
interchangeable
77R24Interchangeable
interchangeable cross-reference
interchangeable
AA59645Interchangeable
interchangeable cross-reference
interchangeable
77R18LR3MV3Interchangeable
interchangeable cross-reference
interchangeable
AA59645-06XHXInterchangeable
interchangeable cross-reference
interchangeable
AA59645-02EEEBInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S12RFFMILG3278A?
S12RFFMILG3278A is a BEARING,BALL,ANNULAR.
What parts can replace S12RFFMILG3278A?
There are 28 known substitutes for S12RFFMILG3278A: R24-FF, 77R24, AA59645 and 25 more. Substitute compatibility should be verified for your specific system.
Is S12RFFMILG3278A still available?
S12RFFMILG3278A 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