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Technical Data Sheet
PartsTable / COMPONENT / 1B3948
1B3948 ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

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 disk_type: MAGNETIC, disk_diameter: 5.250 INCHES NOMINAL IN, disk_quantity: 10, tracks_per_inch: 40, special_features: PREFORMATTED; DOUBLE SIDED,DOUBLE DENSITY,SOFT SECTORED; 40 TRACKS,320KB; USED ON IBM PC KB, disk_density_rating: DS/DD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0350, 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
1B3948
NSN: 3110-00-100-0350
FSC: 3110
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
disk_typeMAGNETIC
disk_diameter5.250 INCHES NOMINAL IN
disk_quantity10
tracks_per_inch40
special_featuresPREFORMATTED; DOUBLE SIDED,DOUBLE DENSITY,SOFT SECTORED; 40 TRACKS,320KB; USED ON IBM PC KB
disk_density_ratingDS/DD
NSN3110-00-100-0350
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 1B3948 · 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
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
27954Interchangeable
interchangeable cross-reference
interchangeable
00044Interchangeable
interchangeable cross-reference
interchangeable
51X1930Interchangeable
interchangeable cross-reference
interchangeable
52055Interchangeable
interchangeable cross-reference
interchangeable
1930Interchangeable
interchangeable cross-reference
interchangeable
5099Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1B3948?
1B3948 is a CUP,TAPERED ROLLER BEARING.
What parts can replace 1B3948?
There are 19 known substitutes for 1B3948: 27954, 00044, 51X1930 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1B3948?
1B3948 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0350. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026