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MA5990BG — CUP,TAPERED ROLLER BEARING

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

MA5990BG: CUP,TAPERED ROLLER BEARING.

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 OVERALL, overall_width: 1.2500 INCHES NOMINAL IN, outside_diameter: 6.3750 INCHES NOMINAL IN, special_features: STEEP ANGLE, backface_corner_radius: 0.1250 INCHES NOMINAL IN, end_item_identification: MRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 11 OTHER WEAPON SYSTEMS. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-0507, 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
MA5990BG
NSN: 3110-00-100-0507
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 61208 — TWIN DISC, INCORPORATED DBA TWIN DISC MID-ATLANTIC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_width1.2500 INCHES NOMINAL IN
outside_diameter6.3750 INCHES NOMINAL IN
special_featuresSTEEP ANGLE
backface_corner_radius0.1250 INCHES NOMINAL IN
end_item_identificationMRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 11 OTHER WEAPON SYSTEMS
standard_tolerance_designationAFBMA CLASS 2
part_name_assigned_by_controlling_agencyBEARING,CUP INR PINION
NSN3110-00-100-0507
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: MA5990BG · 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
•
OUTSIDE DIAMETER: 6.3750 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
MATERIAL: STEEL OVERALL
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
OVERALL WIDTH1.2500 INCHES NOMINAL IN
OUTSIDE DIAMETER6.3750 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
SPECIAL FEATURESSTEEP ANGLE
PART NAME ASSIGNED BY CONTROLLING AGENCYBEARING,CUP INR PINION
END ITEM IDENTIFICATIONMRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 11 OTHER WEAPON SYSTEMS
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 9
9220Reference document
Same NSN cross-reference
Reference document — Secondary reference
FP9220Reference document
Same NSN cross-reference
Reference document — Secondary reference
MA590BGReference document
Same NSN cross-reference
Reference document — Secondary reference
309220Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
7109866Reference document
Same NSN cross-reference
Reference document — Secondary reference
27015-5005Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MA5990BG?
MA5990BG is a CUP,TAPERED ROLLER BEARING.
What parts can replace MA5990BG?
There are 9 known substitutes for MA5990BG: 9220, FP9220, MA590BG and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MA5990BG?
MA5990BG is cataloged in the U.S. Government catalog under NSN 3110-00-100-0507. 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.