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Technical Data Sheet
PartsTable / COMPONENT / 390/393AS
390/393AS ✓ 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 390/393AS is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-3897, 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
390/393AS
NSN: 3110-00-100-3897
FSC: 3110
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
Part Number390/393AS
NSN3110-00-100-3897
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 390/393AS · 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
•
STANDOUT WIDTH: 0.1250 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
BACKFACE CORNER RADIUS: 0.0460 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.0930 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
OVERALL OUTSIDE DIAMETER: 4.3307 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STANDOUT WIDTH0.1250 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
OVERALL WIDTH0.8661 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
BACKFACE CORNER RADIUS0.0460 INCHES NOMINAL IN
CONE CORNER RADIUS0.0930 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
OVERALL OUTSIDE DIAMETER4.3307 INCHES NOMINAL IN
CONE WIDTH0.8661 INCHES NOMINAL IN
CUP WIDTH0.7411 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
12AY7Interchangeable
interchangeable cross-reference
interchangeable
254-0866-00Interchangeable
interchangeable cross-reference
interchangeable
MIL-E-1/639Interchangeable
interchangeable cross-reference
interchangeable
A29317Interchangeable
interchangeable cross-reference
interchangeable
29317Interchangeable
interchangeable cross-reference
interchangeable
11171-29-11GInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 390/393AS?
390/393AS is a 390/393AS.
What parts can replace 390/393AS?
There are 16 known substitutes for 390/393AS: 12AY7, 254-0866-00, MIL-E-1/639 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 390/393AS?
390/393AS is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-3897. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026