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Technical Data Sheet
PartsTable / COMPONENT / 1139291
1139291 ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

The CUP,TAPERED ROLLER BEARING is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include material: STEEL COMP 303 OVERALL, head_style: FLAT CHAMFER, head_height: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.557 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN, thread_length: 0.734 INCHES MINIMUM AND 0.766 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-142-4386, 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
1139291
NSN: 3110-00-142-4386
FSC: 3110
CAGE: 12204 — CHRYSLER REALTY COMPANY LLC DBA DAIMLER CHRYSLER (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleFLAT CHAMFER
head_height0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.557 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
thread_length0.734 INCHES MINIMUM AND 0.766 INCHES MAXIMUM IN
fastener_length4.046 INCHES MINIMUM AND 4.078 INCHES MAXIMUM IN
special_features35.0 DEG CHAMFER 0.343 DEP TOP OUTER EDGE OF HD
thread_directionRIGHT-HAND
width_across_flats0.312 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.375 INCHES IN
NSN3110-00-142-4386
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 1139291 · 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
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
OUTSIDE DIAMETER: 1.9380 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.0460 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: NORMAL ANGLE
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 (FLIS)
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
OVERALL WIDTH0.5625 INCHES NOMINAL IN
OUTSIDE DIAMETER1.9380 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0460 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
STYLE DESIGNATORNORMAL ANGLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
21246Interchangeable
interchangeable cross-reference
interchangeable
54A50A83Interchangeable
interchangeable cross-reference
interchangeable
M76-25606Interchangeable
interchangeable cross-reference
interchangeable
A05219Interchangeable
interchangeable cross-reference
interchangeable
70A3210212-480Interchangeable
interchangeable cross-reference
interchangeable
5897-10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1139291?
1139291 is a CUP,TAPERED ROLLER BEARING.
What parts can replace 1139291?
There are 27 known substitutes for 1139291: 21246, 54A50A83, M76-25606 and 24 more. Substitute compatibility should be verified for your specific system.
Is 1139291 still available?
1139291 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026