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Technical Data Sheet
PartsTable / COMPONENT / L1681-18
L1681-18 ✓ 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 material: STEEL OVERALL, overall_width: 0.7288 INCHES NOMINAL IN, outside_diameter: 3.1510 INCHES NOMINAL IN, style_designator: NORMAL ANGLE, backface_corner_radius: 0.0625 INCHES NOMINAL IN, standard_tolerance_designation: AFBMA CLASS 2. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0561, 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
L1681-18
NSN: 3110-00-100-0561
FSC: 3110
CAGE: 46717 — PETTIBONE LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_width0.7288 INCHES NOMINAL IN
outside_diameter3.1510 INCHES NOMINAL IN
style_designatorNORMAL ANGLE
backface_corner_radius0.0625 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-0561
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: L1681-18 · 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
•
BACKFACE CORNER RADIUS: 0.0625 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NORMAL ANGLE
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
MATERIAL: STEEL OVERALL
•
OUTSIDE DIAMETER: 3.1510 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 (FLIS)
BACKFACE CORNER RADIUS0.0625 INCHES NOMINAL IN
STYLE DESIGNATORNORMAL ANGLE
OVERALL WIDTH0.7288 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
OUTSIDE DIAMETER3.1510 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
15S-3R9KInterchangeable
interchangeable cross-reference
interchangeable
2307-392Interchangeable
interchangeable cross-reference
interchangeable
27820Interchangeable
interchangeable cross-reference
interchangeable
2674Interchangeable
interchangeable cross-reference
interchangeable
27820DInterchangeable
interchangeable cross-reference
interchangeable
7161-01Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is L1681-18?
L1681-18 is a CUP,TAPERED ROLLER BEARING.
What parts can replace L1681-18?
There are 21 known substitutes for L1681-18: 15S-3R9K, 2307-392, 27820 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for L1681-18?
L1681-18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0561. 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