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39660-78 — BEARING,ROLLER,AIRFRAME

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

39660-78: BEARING,ROLLER,AIRFRAME.

The BEARING,ROLLER,AIRFRAME is a the manufacturer industrial component. Key specifications include bore_diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, inner_ring_width: 0.4790 INCHES MINIMUM AND 0.4840 INCHES MAXIMUM IN, outer_ring_width: 0.3300 INCHES MINIMUM AND 0.3350 INCHES MAXIMUM IN, style_designator: CONCAVE ROLLER, DOUBLE CLOSURE, SELF ALIGNING, bearing_seal_type: CONTACT, lubrication_material: GREASE. This part is cataloged in the U.S.

Government catalog under NSN 3110-01-151-1089, 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
39660-78
NSN: 3110-01-151-1089
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 77896 — REXNORD INDUSTRIES, LLC DIV AEROSSPACE BEARING OPERATION (USA)
SPECIFICATIONS
bore_diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
seal_quantity2
shield_quantity2
inner_ring_width0.4790 INCHES MINIMUM AND 0.4840 INCHES MAXIMUM IN
outer_ring_width0.3300 INCHES MINIMUM AND 0.3350 INCHES MAXIMUM IN
style_designatorCONCAVE ROLLER, DOUBLE CLOSURE, SELF ALIGNING
bearing_seal_typeCONTACT
lubrication_materialGREASE
overall_outside_diameter0.9009 INCHES MINIMUM AND 0.9014 INCHES MAXIMUM IN
lubrication_material_document_and_classificationMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
NSN3110-01-151-1089
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 39660-78 · 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
•
BEARING SEAL TYPE: CONTACT
•
LUBRICATION MATERIAL: GREASE
•
OUTER RING WIDTH: 0.3300 INCHES MINIMUM AND 0.3350 INCHES MAXIMUM IN
•
SHIELD QUANTITY: 2
•
STYLE DESIGNATOR: CONCAVE ROLLER, DOUBLE CLOSURE, SELF ALIGNING
•
OVERALL OUTSIDE DIAMETER: 0.9009 INCHES MINIMUM AND 0.9014 INCHES MAXIMUM IN
•
SEAL QUANTITY: 2
•
BORE DIAMETER: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
BEARING SEAL TYPECONTACT
LUBRICATION MATERIALGREASE
OUTER RING WIDTH0.3300 INCHES MINIMUM AND 0.3350 INCHES MAXIMUM IN
SHIELD QUANTITY2
STYLE DESIGNATORCONCAVE ROLLER, DOUBLE CLOSURE, SELF ALIGNING
OVERALL OUTSIDE DIAMETER0.9009 INCHES MINIMUM AND 0.9014 INCHES MAXIMUM IN
SEAL QUANTITY2
BORE DIAMETER0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
INNER RING WIDTH0.4790 INCHES MINIMUM AND 0.4840 INCHES MAXIMUM 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 39660-78?
39660-78 is a BEARING,ROLLER,AIRFRAME.
What is the NSN for 39660-78?
39660-78 is cataloged in the U.S. Government catalog under NSN 3110-01-151-1089. 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.