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504902-21 — BEARING,BALL,ANNULAR

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

504902-21: BEARING,BALL,ANNULAR.

The BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL BALL, bore_shape: STRAIGHT, bore_diameter: 20.00 MILLIMETERS NOMINAL MM, overall_width: 15.00 MILLIMETERS NOMINAL MM, load_direction: RADIAL, surface_finish: GROUND. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-156-6716, 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
504902-21
NSN: 3110-00-156-6716
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 23667 — SMITHS DETECTION INC. DBA SMITHS DETECTION INC CASC (USA)
SPECIFICATIONS
materialSTEEL BALL
bore_shapeSTRAIGHT
bore_diameter20.00 MILLIMETERS NOMINAL MM
overall_width15.00 MILLIMETERS NOMINAL MM
load_directionRADIAL
surface_finishGROUND
style_designatorCOUNTERBORED OUTER RING, MAGNETO TYPE, S EPARABLE
end_item_identificationLOGISTICS SUPPORT VESSEL
overall_outside_diameter52.00 MILLIMETERS NOMINAL MM
internal_fit-up_designationSTANDARD
nondefinitive_spec/std_data132 TYPE AND 00 GRADE
standard_tolerance_designationABEC NO.1
NSN3110-00-156-6716
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 504902-21 · 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
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
SURFACE FINISH: GROUND
•
STYLE DESIGNATOR: COUNTERBORED OUTER RING, MAGNETO TYPE, S EPARABLE
•
OVERALL OUTSIDE DIAMETER: 52.00 MILLIMETERS NOMINAL MM
•
BORE SHAPE: STRAIGHT
•
NONDEFINITIVE SPEC/STD DATA: 132 TYPE AND 00 GRADE
•
LOAD DIRECTION: RADIAL
TECHNICAL CHARACTERISTICS
INTERNAL FIT-UP DESIGNATIONSTANDARD
SURFACE FINISHGROUND
STYLE DESIGNATORCOUNTERBORED OUTER RING, MAGNETO TYPE, S EPARABLE
OVERALL WIDTH15.00 MILLIMETERS NOMINAL MM
OVERALL OUTSIDE DIAMETER52.00 MILLIMETERS NOMINAL MM
BORE SHAPESTRAIGHT
NONDEFINITIVE SPEC/STD DATA132 TYPE AND 00 GRADE
LOAD DIRECTIONRADIAL
END ITEM IDENTIFICATIONLOGISTICS SUPPORT VESSEL
STANDARD TOLERANCE DESIGNATIONABEC NO.1
SUBSTITUTES & CROSS-REFERENCES 3
FFB171Reference document
Same NSN cross-reference
Reference document — Identification reference
TM20Reference document
Same NSN cross-reference
Reference document — Secondary reference
M20Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 504902-21?
504902-21 is a BEARING,BALL,ANNULAR.
What parts can replace 504902-21?
There are 3 known substitutes for 504902-21: FFB171, TM20, M20. Substitute compatibility should be verified for your specific system.
What is the NSN for 504902-21?
504902-21 is cataloged in the U.S. Government catalog under NSN 3110-00-156-6716. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.