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B3312 — CUP,TAPERED ROLLER BEARING

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

B3312: 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, nut_style: TUBE COUPLING, nut_height: 0.469 INCHES NOMINAL IN, seat_angle: 25.00 DEGREES NOMINAL, thread_class: 3B, overall_width: 1.3750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-0340, 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
MRO→ MRO_GENERAL→ B3312
NSN: 3110-00-100-0340
NIINs: 001000340, 004316343, 010622078, 015992743
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 14541 — COOPER MACHINERY SERVICES LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE COUPLING
nut_height0.469 INCHES NOMINAL IN
seat_angle25.00 DEGREES NOMINAL
thread_class3B
overall_width1.3750 INCHES NOMINAL IN
thread_seriesUNF
outside_diameter8.1250 INCHES NOMINAL IN
style_designatorNORMAL ANGLE
thread_directionRIGHT-HAND
fabrication_methodMACHINED
width_across_flats0.375 INCHES NOMINAL IN
NSN3110-00-100-0340
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: B3312 · 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
•
STYLE DESIGNATOR: NORMAL ANGLE
•
OUTSIDE DIAMETER: 8.1250 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
STYLE DESIGNATORNORMAL ANGLE
OVERALL WIDTH1.3750 INCHES NOMINAL IN
OUTSIDE DIAMETER8.1250 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 9
385397-B 01-408Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
385397-A 01-408Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
A22705Reference document
Same NSN cross-reference
Reference document — Secondary reference
6B4370Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
792Reference document
Same NSN cross-reference
Reference document — Secondary reference
93244Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B3312?
B3312 is a CUP,TAPERED ROLLER BEARING. It is classified as a MRO (MRO_GENERAL).
What parts can replace B3312?
There are 9 known substitutes for B3312: 385397-B 01-408, 385397-A 01-408, A22705 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B3312?
B3312 is cataloged in the U.S. Government catalog under NSN 3110-00-100-0340. 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.