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551397B — BEARING,BALL,ANNULAR

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

551397B: BEARING,BALL,ANNULAR.

The BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL COMP M50 OVERALL, bore_shape: STRAIGHT, bore_diameter: 2.1651 INCHES MINIMUM AND 2.1654 INCHES MAXIMUM IN, load_direction: ANGULAR, surface_finish: GROUND, inner_ring_width: 0.9250 INCHES MINIMUM AND 0.9300 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-01-202-6680, 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
551397B
NSN: 3110-01-202-6680
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: D2456 — SCHAEFFLER AEROSPACE GERMANY GMBH & CO. KG (DEU)
SPECIFICATIONS
materialSTEEL COMP M50 OVERALL
bore_shapeSTRAIGHT
bore_diameter2.1651 INCHES MINIMUM AND 2.1654 INCHES MAXIMUM IN
load_directionANGULAR
surface_finishGROUND
inner_ring_width0.9250 INCHES MINIMUM AND 0.9300 INCHES MAXIMUM IN
outer_ring_width0.7537 INCHES MINIMUM AND 0.7587 INCHES MAXIMUM IN
style_designatorLOADING GROOVE, NON-SEPARABLE
end_item_identificationCH47D,HELICOPTER
overall_outside_diameter3.5430 INCHES MINIMUM AND 3.5433 INCHES MAXIMUM IN
precious_material_and_locationRETAING RING SILVER
NSN3110-01-202-6680
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 551397B · 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
•
OUTER RING WIDTH: 0.7537 INCHES MINIMUM AND 0.7587 INCHES MAXIMUM IN
•
SURFACE FINISH: GROUND
•
STYLE DESIGNATOR: LOADING GROOVE, NON-SEPARABLE
•
OVERALL OUTSIDE DIAMETER: 3.5430 INCHES MINIMUM AND 3.5433 INCHES MAXIMUM IN
•
BORE SHAPE: STRAIGHT
•
LOAD DIRECTION: ANGULAR
•
PRECIOUS MATERIAL AND LOCATION: RETAING RING SILVER
TECHNICAL CHARACTERISTICS
OUTER RING WIDTH0.7537 INCHES MINIMUM AND 0.7587 INCHES MAXIMUM IN
SURFACE FINISHGROUND
STYLE DESIGNATORLOADING GROOVE, NON-SEPARABLE
OVERALL OUTSIDE DIAMETER3.5430 INCHES MINIMUM AND 3.5433 INCHES MAXIMUM IN
BORE SHAPESTRAIGHT
LOAD DIRECTIONANGULAR
PRECIOUS MATERIAL AND LOCATIONRETAING RING SILVER
END ITEM IDENTIFICATIONCH47D,HELICOPTER
BORE DIAMETER2.1651 INCHES MINIMUM AND 2.1654 INCHES MAXIMUM IN
MATERIALSTEEL COMP M50 OVERALL
OTHER ITEMS IN FSC 3110 — Bearings, Antifriction, Unmounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3110-00-001-1937 3110-00-001-1938 3110-00-001-4661 3110-00-001-4662 3110-00-001-4689 3110-00-001-4722
SUBSTITUTES & CROSS-REFERENCES 3
AAV9111K6MSRReference document
Same NSN cross-reference
Reference document — Secondary reference
114DS669-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
114DS669Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 551397B?
551397B is a BEARING,BALL,ANNULAR.
What parts can replace 551397B?
There are 3 known substitutes for 551397B: AAV9111K6MSR, 114DS669-3, 114DS669. Substitute compatibility should be verified for your specific system.
What is the NSN for 551397B?
551397B is cataloged in the U.S. Government catalog under NSN 3110-01-202-6680. 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.