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3879-3820B — BEARING,ROLLER,TAPERED

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

3879-3820B: BEARING,ROLLER,TAPERED.

The BEARING,ROLLER,TAPERED is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include material: STEEL OVERALL, cup_width: 0.9375 INCHES NOMINAL IN, cone_width: 1.1875 INCHES NOMINAL IN, flange_width: 0.1875 INCHES NOMINAL IN, bore_diameter: 1.5749 INCHES NOMINAL IN, overall_width: 1.1875 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-204-5378, 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
3879-3820B
NSN: 3110-00-204-5378
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.9375 INCHES NOMINAL IN
cone_width1.1875 INCHES NOMINAL IN
flange_width0.1875 INCHES NOMINAL IN
bore_diameter1.5749 INCHES NOMINAL IN
overall_width1.1875 INCHES NOMINAL IN
standout_width0.2500 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, FLANGED CUP, NORMAL ANGLE
cone_corner_radius0.0300 INCHES NOMINAL IN
cup_outside_diameter3.3750 INCHES NOMINAL IN
lubrication_materialLUBRICANT
backface_corner_radius0.1300 INCHES NOMINAL IN
NSN3110-00-204-5378
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 3879-3820B · 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
•
LUBRICATION MATERIAL: LUBRICANT
•
CUP OUTSIDE DIAMETER: 3.3750 INCHES NOMINAL IN
•
FLANGE OUTSIDE DIAMETER: 3.5270 INCHES NOMINAL IN
•
CUP WIDTH: 0.9375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, FLANGED CUP, NORMAL ANGLE
•
BACKFACE CORNER RADIUS: 0.1300 INCHES NOMINAL IN
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
RETAINER FABRICATION METHODPRESSED
LUBRICATION MATERIALLUBRICANT
CUP OUTSIDE DIAMETER3.3750 INCHES NOMINAL IN
FLANGE OUTSIDE DIAMETER3.5270 INCHES NOMINAL IN
CUP WIDTH0.9375 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, FLANGED CUP, NORMAL ANGLE
OVERALL WIDTH1.1875 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1300 INCHES NOMINAL IN
CONE CORNER RADIUS0.0300 INCHES NOMINAL IN
STANDOUT WIDTH0.2500 INCHES NOMINAL IN
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 1
SER6743PT30Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3879-3820B?
3879-3820B is a BEARING,ROLLER,TAPERED.
What parts can replace 3879-3820B?
There is 1 known substitute for 3879-3820B: SER6743PT30. Substitute compatibility should be verified for your specific system.
What is the NSN for 3879-3820B?
3879-3820B is cataloged in the U.S. Government catalog under NSN 3110-00-204-5378. 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.