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39521 — CUP,TAPERED ROLLER BEARING

✓ Government record, cited
Clementoni · TAPERED BEARING
PRODUCT OVERVIEW

39521: CUP,TAPERED ROLLER BEARING.

The CUP,TAPERED ROLLER BEARING is a Clementoni tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include special_features: INCLUDES LINING, end_item_identification: 3930-01-382-2567. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-078-9579, 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
39521
NSN: 3110-00-078-9579
NIINs: 000789579, 002916492, 010935493, 014392907, 015868651
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
special_featuresINCLUDES LINING
end_item_identification3930-01-382-2567
NSN3110-00-078-9579
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 39521 · Clementoni ⚠ 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
•
STYLE DESIGNATOR: NORMAL ANGLE
•
OUTSIDE DIAMETER: 4.4375 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.0300 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
STYLE DESIGNATORNORMAL ANGLE
OVERALL WIDTH0.9375 INCHES NOMINAL IN
OUTSIDE DIAMETER4.4375 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0300 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 3
2GN331Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
D79397Reference document
Same NSN cross-reference
Reference document — Secondary reference
79397Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 39521?
39521 is a CUP,TAPERED ROLLER BEARING manufactured by Clementoni.
What parts can replace 39521?
There are 3 known substitutes for 39521: 2GN331, D79397, 79397. Substitute compatibility should be verified for your specific system.
What is the NSN for 39521?
39521 is cataloged in the U.S. Government catalog under NSN 3110-00-078-9579. 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.