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399AS394DX4S399A — BEARING,ROLLER,TAPERED

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

399AS394DX4S399A: 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: 1.8115 INCHES NOMINAL IN, bore_diameter: 2.6875 INCHES NOMINAL IN, overall_width: 2.0625 INCHES NOMINAL IN, standout_width: 0.1250 INCHES NOMINAL IN, special_features: WITH CONE SPACER X4S399A,0.008 IN. MIN.,0.010 MAX.

END PLAY,OIL HOLES AND GROOVE IN CUP IN. This part is cataloged in the U.S. Government catalog under NSN 3110-00-412-2644, 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
399AS394DX4S399A
NSN: 3110-00-412-2644
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width1.8115 INCHES NOMINAL IN
bore_diameter2.6875 INCHES NOMINAL IN
overall_width2.0625 INCHES NOMINAL IN
standout_width0.1250 INCHES NOMINAL IN
special_featuresWITH CONE SPACER X4S399A,0.008 IN. MIN.,0.010 MAX. END PLAY,OIL HOLES AND GROOVE IN CUP IN
style_designatorSTRAIGHT BORE, DOUBLE CUP, SINGLE CONES
cone_corner_radius0.2000 INCHES NOMINAL IN
backface_corner_radius0.0300 INCHES NOMINAL IN
overall_outside_diameter4.3307 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-412-2644
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 399AS394DX4S399A · 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: 1.8115 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, DOUBLE CUP, SINGLE CONES
•
OVERALL OUTSIDE DIAMETER: 4.3307 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.0300 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.2000 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.1250 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
CUP WIDTH1.8115 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, DOUBLE CUP, SINGLE CONES
OVERALL WIDTH2.0625 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER4.3307 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0300 INCHES NOMINAL IN
CONE CORNER RADIUS0.2000 INCHES NOMINAL IN
STANDOUT WIDTH0.1250 INCHES NOMINAL IN
SPECIAL FEATURESWITH CONE SPACER X4S399A,0.008 IN. MIN.,0.010 MAX. END PLAY,OIL HOLES AND GROOVE IN CUP IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BORE DIAMETER2.6875 INCHES NOMINAL IN
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 1
399AS-9U263Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 399AS394DX4S399A?
399AS394DX4S399A is a BEARING,ROLLER,TAPERED.
What parts can replace 399AS394DX4S399A?
There is 1 known substitute for 399AS394DX4S399A: 399AS-9U263. Substitute compatibility should be verified for your specific system.
What is the NSN for 399AS394DX4S399A?
399AS394DX4S399A is cataloged in the U.S. Government catalog under NSN 3110-00-412-2644. 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.