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Technical Data Sheet

FF-B-187/01-688 — BEARING,ROLLER,TAPERED

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

FF-B-187/01-688: 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 SEPARATOR SLUG, cup_width: 0.4688 INCHES NOMINAL IN, cone_width: 0.5938 INCHES NOMINAL IN, bore_diameter: 4.0000 INCHES NOMINAL IN, overall_width: 0.6250 INCHES NOMINAL IN, alignment_type: RIGID. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-5358, 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-187/01-688
NSN: 3110-00-100-5358
NIINs: 001005358, 011904114
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL SEPARATOR SLUG
cup_width0.4688 INCHES NOMINAL IN
cone_width0.5938 INCHES NOMINAL IN
bore_diameter4.0000 INCHES NOMINAL IN
overall_width0.6250 INCHES NOMINAL IN
alignment_typeRIGID
standout_width0.1562 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.0600 INCHES NOMINAL IN
backface_corner_radius0.0600 INCHES NOMINAL IN
overall_outside_diameter5.3125 INCHES NOMINAL IN
retainer_fabrication_methodPRESSED
NSN3110-00-100-5358
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: FF-B-187/01-688 · 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
•
CUP WIDTH: 0.8438 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
OVERALL OUTSIDE DIAMETER: 5.8437 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1200 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.2813 INCHES NOMINAL IN
•
CONE WIDTH: 1.1406 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
CUP WIDTH0.8438 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
OVERALL WIDTH1.1250 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER5.8437 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
CONE CORNER RADIUS0.1200 INCHES NOMINAL IN
STANDOUT WIDTH0.2813 INCHES NOMINAL IN
CONE WIDTH1.1406 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BORE DIAMETER3.7500 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
FFB187/01-668Reference document
Same NSN cross-reference
Reference document — Secondary reference
FF-B-187/1Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is FF-B-187/01-688?
FF-B-187/01-688 is a BEARING,ROLLER,TAPERED.
What parts can replace FF-B-187/01-688?
There are 2 known substitutes for FF-B-187/01-688: FFB187/01-668, FF-B-187/1. Substitute compatibility should be verified for your specific system.
What is the NSN for FF-B-187/01-688?
FF-B-187/01-688 is cataloged in the U.S. Government catalog under NSN 3110-00-100-5358. 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.