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3120B — CUP,TAPERED ROLLER BEARING

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

3120B: CUP,TAPERED ROLLER BEARING.

The CUP,TAPERED ROLLER BEARING is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include diameter: 4.750 INCHES NOMINAL IN, material: COPPER ALLOY, construction: SEAMLESS, wall_thickness: 0.083 INCHES NOMINAL IN, first_end_style: PLAIN, cross-sectional_shape_style: PLAIN ROUND. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-142-4403, 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
3120B
NSN: 3110-00-142-4403
NIINs: 001424403, 002184018
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
diameter4.750 INCHES NOMINAL IN
materialCOPPER ALLOY
constructionSEAMLESS
wall_thickness0.083 INCHES NOMINAL IN
first_end_stylePLAIN
cross-sectional_shape_stylePLAIN ROUND
measuring_method_and_length17.125 INCHES NOMINAL SPECIFIC IN
second_end_relationship_with_first_endIDENTICAL
NSN3110-00-142-4403
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 3120B · 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 OUTSIDE DIAMETER: 3.0473 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NORMAL ANGLE, FLANGED
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
FLANGE WIDTH: 0.1875 INCHES NOMINAL IN
•
OUTER RING OUTSIDE DIAMETER: 2.8593 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
MATERIAL: STEEL OVERALL
TYPICAL APPLICATIONS
  • Long-term data archival and compliance retention
  • Offsite backup and disaster recovery
  • Air-gapped ransomware protection
  • Cold storage tier for infrequently accessed data
TECHNICAL CHARACTERISTICS
FLANGE OUTSIDE DIAMETER3.0473 INCHES NOMINAL IN
STYLE DESIGNATORNORMAL ANGLE, FLANGED
OVERALL WIDTH0.9375 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
FLANGE WIDTH0.1875 INCHES NOMINAL IN
OUTER RING OUTSIDE DIAMETER2.8593 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3120B?
3120B is a CUP,TAPERED ROLLER BEARING.
What is the NSN for 3120B?
3120B is cataloged in the U.S. Government catalog under NSN 3110-00-142-4403. 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.