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HF4644 — BEARING,ROLLER,TAPERED

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

HF4644: 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: 1.8125 INCHES NOMINAL IN, cone_width: 2.2650 INCHES NOMINAL IN, bore_diameter: 4.0000 INCHES NOMINAL IN, overall_width: 2.2500 INCHES NOMINAL IN, standout_width: 0.4375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-227-3261, 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
HF4644
NSN: 3110-00-227-3261
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 95685 — MARATHON LE TOURNEAU CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width1.8125 INCHES NOMINAL IN
cone_width2.2650 INCHES NOMINAL IN
bore_diameter4.0000 INCHES NOMINAL IN
overall_width2.2500 INCHES NOMINAL IN
standout_width0.4375 INCHES NOMINAL IN
special_featuresDUTY CLASS HH SERIES
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.3120 INCHES NOMINAL IN
backface_corner_radius0.1250 INCHES NOMINAL IN
overall_outside_diameter7.5000 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-227-3261
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: HF4644 · 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: 1.8125 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
OVERALL OUTSIDE DIAMETER: 7.5000 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.3120 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.4375 INCHES NOMINAL IN
•
CONE WIDTH: 2.2650 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 WIDTH1.8125 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
OVERALL WIDTH2.2500 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER7.5000 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
CONE CORNER RADIUS0.3120 INCHES NOMINAL IN
STANDOUT WIDTH0.4375 INCHES NOMINAL IN
CONE WIDTH2.2650 INCHES NOMINAL IN
SPECIAL FEATURESDUTY CLASS HH SERIES
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
SUBSTITUTES & CROSS-REFERENCES 3
073-4644Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
65393Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
HH221410H221449Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is HF4644?
HF4644 is a BEARING,ROLLER,TAPERED.
What parts can replace HF4644?
There are 3 known substitutes for HF4644: 073-4644, 65393, HH221410H221449. Substitute compatibility should be verified for your specific system.
What is the NSN for HF4644?
HF4644 is cataloged in the U.S. Government catalog under NSN 3110-00-227-3261. 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.