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AT12-1 — BEARING,ROLLER,NEEDLE

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

AT12-1: BEARING,ROLLER,NEEDLE.

The BEARING,ROLLER,NEEDLE is a the manufacturer industrial component. Key specifications include bore_diameter: 0.7500 INCHES NOMINAL IN, alignment_type: RIGID, surface_treatment: CADMIUM OVERALL, lubrication_material: GREASE, end_item_identification: 4940-01-551-2884, MAINTENANCE FACILITY, TRANSPORTABLE, overall_outside_diameter: 1.3750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-159-9555, 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
AT12-1
NSN: 3110-00-159-9555
NIINs: 001599555, 015708592
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 3NPS1 — RBC AIRCRAFT PRODUCTS, INC. (USA)
SPECIFICATIONS
bore_diameter0.7500 INCHES NOMINAL IN
alignment_typeRIGID
surface_treatmentCADMIUM OVERALL
lubrication_materialGREASE
end_item_identification4940-01-551-2884, MAINTENANCE FACILITY, TRANSPORTABLE
overall_outside_diameter1.3750 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyATTACHMENT, LUG BACK, 400B
NSN3110-00-159-9555
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: AT12-1 · 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
•
LUBRICATION MATERIAL: GREASE
•
OVERALL OUTSIDE DIAMETER: 1.3750 INCHES NOMINAL IN
•
ALIGNMENT TYPE: RIGID
•
SURFACE TREATMENT: CADMIUM OVERALL
•
BORE DIAMETER: 0.7500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
LUBRICATION MATERIALGREASE
OVERALL OUTSIDE DIAMETER1.3750 INCHES NOMINAL IN
ALIGNMENT TYPERIGID
SURFACE TREATMENTCADMIUM OVERALL
BORE DIAMETER0.7500 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
AT12-1ANG25Reference document
Same NSN cross-reference
Reference document — Secondary reference
AT12-1MILG3278AReference 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 AT12-1?
AT12-1 is a BEARING,ROLLER,NEEDLE.
What parts can replace AT12-1?
There are 2 known substitutes for AT12-1: AT12-1ANG25, AT12-1MILG3278A. Substitute compatibility should be verified for your specific system.
What is the NSN for AT12-1?
AT12-1 is cataloged in the U.S. Government catalog under NSN 3110-00-159-9555. 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.