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999999K121NT — BEARING,BALL,ANNULAR

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

999999K121NT: BEARING,BALL,ANNULAR.

The BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, bore_diameter: 2.3620 INCHES MINIMUM AND 2.3622 INCHES MAXIMUM IN, overall_width: 1.3730 INCHES MINIMUM AND 1.3780 INCHES MAXIMUM IN, load_direction: ANGULAR, surface_finish: GROUND, style_designator: UNIVERSAL GROUND FACES, COUNTERBORED OUTER RING, NON-SEPARABLE. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-991-0966, 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
999999K121NT
NSN: 3110-00-991-0966
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_diameter2.3620 INCHES MINIMUM AND 2.3622 INCHES MAXIMUM IN
overall_width1.3730 INCHES MINIMUM AND 1.3780 INCHES MAXIMUM IN
load_directionANGULAR
surface_finishGROUND
style_designatorUNIVERSAL GROUND FACES, COUNTERBORED OUTER RING, NON-SEPARABLE
overall_outside_diameter5.9053 INCHES MINIMUM AND 5.9055 INCHES MAXIMUM IN
bearing_preload_designationLIGHT
internal_fit-up_designationTIGHT
nondefinitive_spec/std_data134 TYPE AND 1 CLASS
retainer_fabrication_methodPRESSED
departure_from_cited_documentANNUAL BALL BEARING FOR QUIET OPERATION APPLICATION TO SUBMARINE USAGE
NSN3110-00-991-0966
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 999999K121NT · 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
•
RETAINER FABRICATION METHOD: PRESSED
•
INTERNAL FIT-UP DESIGNATION: TIGHT
•
SURFACE FINISH: GROUND
•
BEARING PRELOAD DESIGNATION: LIGHT
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
STYLE DESIGNATOR: UNIVERSAL GROUND FACES, COUNTERBORED OUTER RING, NON-SEPARABLE
•
OVERALL OUTSIDE DIAMETER: 5.9053 INCHES MINIMUM AND 5.9055 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
RETAINER FABRICATION METHODPRESSED
INTERNAL FIT-UP DESIGNATIONTIGHT
SURFACE FINISHGROUND
BEARING PRELOAD DESIGNATIONLIGHT
CRITICALITY CODE JUSTIFICATIONZZZW
STYLE DESIGNATORUNIVERSAL GROUND FACES, COUNTERBORED OUTER RING, NON-SEPARABLE
OVERALL WIDTH1.3730 INCHES MINIMUM AND 1.3780 INCHES MAXIMUM IN
OVERALL OUTSIDE DIAMETER5.9053 INCHES MINIMUM AND 5.9055 INCHES MAXIMUM IN
DEPARTURE FROM CITED DOCUMENTANNUAL BALL BEARING FOR QUIET OPERATION APPLICATION TO SUBMARINE USAGE
NONDEFINITIVE SPEC/STD DATA134 TYPE AND 1 CLASS
SUBSTITUTES & CROSS-REFERENCES 8
30412DTL7077NTSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1-2186500-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
MILB17931NTReference document
Same NSN cross-reference
Reference document — Secondary reference
7412BGM2BRGSW1BNTSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
M17931-A027NTSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
M17931-A027Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedDemilitarization required — mutilation + specific procedure
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FREQUENTLY ASKED QUESTIONS
What is 999999K121NT?
999999K121NT is a BEARING,BALL,ANNULAR.
What parts can replace 999999K121NT?
There are 8 known substitutes for 999999K121NT: 30412DTL7077NT, 1-2186500-1, MILB17931NT and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 999999K121NT?
999999K121NT is cataloged in the U.S. Government catalog under NSN 3110-00-991-0966. 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.