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Technical Data Sheet
PartsTable / COMPONENT / F5DDMILG3278A
F5DDMILG3278A ✓ 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, flange_width: 0.0420 INCHES NOMINAL IN, bore_diameter: 0.3125 INCHES MINIMUM IN, load_direction: RADIAL, surface_finish: GROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-227-2443, 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
F5DDMILG3278A
NSN: 3110-00-227-2443
FSC: 3110
CAGE: 21335 — TIMKEN CO DIV THE TIMKEN COMPANY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
flange_width0.0420 INCHES NOMINAL IN
bore_diameter0.3125 INCHES MINIMUM IN
load_directionRADIAL
surface_finishGROUND
shield_quantity2
inner_ring_width0.2490 INCHES MINIMUM IN
outer_ring_taper0.0680 PER FOOT IN INCHES NOMINAL
outer_ring_width0.2250 INCHES NOMINAL IN
special_featuresREMOVABLE SHIELDS
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
NSN3110-00-227-2443
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: F5DDMILG3278A · 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
•
FLANGE WIDTH: 0.0420 INCHES NOMINAL IN
•
OUTER RING WIDTH: 0.2250 INCHES NOMINAL IN
•
SURFACE FINISH: GROUND
•
BORE SHAPE: STRAIGHT
•
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
•
OUTER RING TAPER: 0.0680 PER FOOT IN INCHES NOMINAL
•
LUBRICATION MATERIAL: GREASE
TECHNICAL CHARACTERISTICS (FLIS)
FLANGE WIDTH0.0420 INCHES NOMINAL IN
OUTER RING WIDTH0.2250 INCHES NOMINAL IN
SURFACE FINISHGROUND
SPECIAL FEATURESREMOVABLE SHIELDS
BORE SHAPESTRAIGHT
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
OUTER RING TAPER0.0680 PER FOOT IN INCHES NOMINAL
LUBRICATION MATERIALGREASE
SHIELD QUANTITY2
INNER RING WIDTH0.2490 INCHES MINIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
25831Interchangeable
interchangeable cross-reference
interchangeable
A10-6186Interchangeable
interchangeable cross-reference
interchangeable
U-65A138-140Interchangeable
interchangeable cross-reference
interchangeable
38014Interchangeable
interchangeable cross-reference
interchangeable
131489Interchangeable
interchangeable cross-reference
interchangeable
132731Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is F5DDMILG3278A?
F5DDMILG3278A is a BEARING,BALL,ANNULAR.
What parts can replace F5DDMILG3278A?
There are 20 known substitutes for F5DDMILG3278A: 25831, A10-6186, U-65A138-140 and 17 more. Substitute compatibility should be verified for your specific system.
Is F5DDMILG3278A still available?
F5DDMILG3278A 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