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B27540 — BEARING,ROLLER,TAPERED

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

B27540: 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: 4.9790 INCHES MINIMUM AND 5.0050 INCHES MAXIMUM IN, cone_width: 3.6285 INCHES NOMINAL IN, bore_diameter: 4.5000 INCHES MINIMUM AND 4.5010 INCHES MAXIMUM IN, overall_width: 7.2570 INCHES MINIMUM AND 7.2750 INCHES MAXIMUM IN, standout_width: 1.1250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-293-8958, 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
B27540
NSN: 3110-00-293-8958
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width4.9790 INCHES MINIMUM AND 5.0050 INCHES MAXIMUM IN
cone_width3.6285 INCHES NOMINAL IN
bore_diameter4.5000 INCHES MINIMUM AND 4.5010 INCHES MAXIMUM IN
overall_width7.2570 INCHES MINIMUM AND 7.2750 INCHES MAXIMUM IN
standout_width1.1250 INCHES NOMINAL IN
special_featuresHH SERIES,2 SINGLE CUPS AND 2 SINGLE CONES W/CONE AND CUP SPACERS
style_designatorSTRAIGHT BORE, DOUBLE CUP, SINGLE CONES
cone_corner_radius0.2500 INCHES MINIMUM AND 0.2660 INCHES MAXIMUM IN
lubrication_materialGREASE
backface_corner_radius0.0620 INCHES MINIMUM AND 0.0780 INCHES MAXIMUM IN
overall_outside_diameter11.0000 INCHES MINIMUM AND 11.0010 INCHES MAXIMUM IN
NSN3110-00-293-8958
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: B27540 · 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
•
LUBRICATION MATERIAL: GREASE
•
CUP WIDTH: 4.9790 INCHES MINIMUM AND 5.0050 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: STRAIGHT BORE, DOUBLE CUP, SINGLE CONES
•
OVERALL OUTSIDE DIAMETER: 11.0000 INCHES MINIMUM AND 11.0010 INCHES MAXIMUM IN
•
BACKFACE CORNER RADIUS: 0.0620 INCHES MINIMUM AND 0.0780 INCHES MAXIMUM IN
•
CONE CORNER RADIUS: 0.2500 INCHES MINIMUM AND 0.2660 INCHES MAXIMUM IN
•
STANDOUT WIDTH: 1.1250 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
LUBRICATION MATERIALGREASE
CUP WIDTH4.9790 INCHES MINIMUM AND 5.0050 INCHES MAXIMUM IN
STYLE DESIGNATORSTRAIGHT BORE, DOUBLE CUP, SINGLE CONES
OVERALL WIDTH7.2570 INCHES MINIMUM AND 7.2750 INCHES MAXIMUM IN
OVERALL OUTSIDE DIAMETER11.0000 INCHES MINIMUM AND 11.0010 INCHES MAXIMUM IN
BACKFACE CORNER RADIUS0.0620 INCHES MINIMUM AND 0.0780 INCHES MAXIMUM IN
CONE CORNER RADIUS0.2500 INCHES MINIMUM AND 0.2660 INCHES MAXIMUM IN
STANDOUT WIDTH1.1250 INCHES NOMINAL IN
CONE WIDTH3.6285 INCHES NOMINAL IN
SPECIAL FEATURESHH SERIES,2 SINGLE CUPS AND 2 SINGLE CONES W/CONE AND CUP SPACERS
SUBSTITUTES & CROSS-REFERENCES 3
327540Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2243721Reference document
Same NSN cross-reference
Reference document — Secondary reference
HU45674-1PC57Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B27540?
B27540 is a BEARING,ROLLER,TAPERED.
What parts can replace B27540?
There are 3 known substitutes for B27540: 327540, 2243721, HU45674-1PC57. Substitute compatibility should be verified for your specific system.
What is the NSN for B27540?
B27540 is cataloged in the U.S. Government catalog under NSN 3110-00-293-8958. 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.