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25577-25520 — BEARING,ROLLER,TAPERED

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

25577-25520: 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: 0.7500 INCHES NOMINAL IN, cone_width: 1.0000 INCHES NOMINAL IN, bore_diameter: 1.6880 INCHES NOMINAL IN, overall_width: 0.9375 INCHES NOMINAL IN, standout_width: 0.1875 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-5302, 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
25577-25520
NSN: 3110-00-100-5302
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.7500 INCHES NOMINAL IN
cone_width1.0000 INCHES NOMINAL IN
bore_diameter1.6880 INCHES NOMINAL IN
overall_width0.9375 INCHES NOMINAL IN
standout_width0.1875 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.1400 INCHES NOMINAL IN
backface_corner_radius0.0310 INCHES NOMINAL IN
overall_outside_diameter3.2560 INCHES NOMINAL IN
nondefinitive_spec/std_data751 TYPE
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-5302
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 25577-25520 · 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: 0.7500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
OVERALL OUTSIDE DIAMETER: 3.2560 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.0310 INCHES NOMINAL IN
•
NONDEFINITIVE SPEC/STD DATA: 751 TYPE
•
CONE CORNER RADIUS: 0.1400 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.1875 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 WIDTH0.7500 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
OVERALL WIDTH0.9375 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER3.2560 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0310 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATA751 TYPE
CONE CORNER RADIUS0.1400 INCHES NOMINAL IN
STANDOUT WIDTH0.1875 INCHES NOMINAL IN
CONE WIDTH1.0000 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
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 2
FF-B-187Reference document
Same NSN cross-reference
Reference document — Identification reference
FFB187TYPE751Reference document
Same NSN cross-reference
Reference document — Secondary 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 25577-25520?
25577-25520 is a BEARING,ROLLER,TAPERED.
What parts can replace 25577-25520?
There are 2 known substitutes for 25577-25520: FF-B-187, FFB187TYPE751. Substitute compatibility should be verified for your specific system.
What is the NSN for 25577-25520?
25577-25520 is cataloged in the U.S. Government catalog under NSN 3110-00-100-5302. 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.