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Technical Data Sheet
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FF-B-187/1 — Technical Data Sheet

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— · 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 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: 0.6563 INCHES NOMINAL IN, cone_width: 0.8125 INCHES NOMINAL IN, bore_diameter: 3.5000 INCHES NOMINAL IN, overall_width: 0.8125 INCHES NOMINAL IN, alignment_type: RIGID. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-053-9360, 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
FF-B-187/1
NSN: 3110-00-053-9360
FSC: 3110
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.6563 INCHES NOMINAL IN
cone_width0.8125 INCHES NOMINAL IN
bore_diameter3.5000 INCHES NOMINAL IN
overall_width0.8125 INCHES NOMINAL IN
alignment_typeRIGID
standout_width0.1563 INCHES NOMINAL IN
outside_diameter4.7500 INCHES NOMINAL IN
special_featuresDUTY CL HM SERIES
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.0620 INCHES NOMINAL IN
lubrication_materialGREASE
NSN3110-00-053-9360
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: FF-B-187/1 · 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
•
BORE DIAMETER: 1.1875 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.0620 INCHES NOMINAL IN
•
OVERALL OUTSIDE DIAMETER: 2.5312 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
STANDOUT WIDTH: 0.1875 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
BACKFACE CORNER RADIUS: 0.0620 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
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)
BORE DIAMETER1.1875 INCHES NOMINAL IN
CONE CORNER RADIUS0.0620 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER2.5312 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
STANDOUT WIDTH0.1875 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
BACKFACE CORNER RADIUS0.0620 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
CUP WIDTH0.6563 INCHES NOMINAL IN
CONE WIDTH0.8438 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
63513Interchangeable
interchangeable cross-reference
interchangeable
3156063Interchangeable
interchangeable cross-reference
interchangeable
D73569Interchangeable
interchangeable cross-reference
interchangeable
73569Interchangeable
interchangeable cross-reference
interchangeable
2849-008Interchangeable
interchangeable cross-reference
interchangeable
951025-8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF-B-187/1?
FF-B-187/1 is a BEARING,ROLLER,TAPERED.
What parts can replace FF-B-187/1?
There are 12 known substitutes for FF-B-187/1: 63513, 3156063, D73569 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FF-B-187/1?
FF-B-187/1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-053-9360. 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: September 2026