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Technical Data Sheet
PartsTable / COMPONENT / 8438-1
8438-1 ✓ 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

OSCILLATOR,NONCRYSTAL CONTROLLED. Key specifications include material: STEEL OVERALL, overall_width: 1.1250 INCHES NOMINAL IN, outside_diameter: 5.5115 INCHES NOMINAL IN, style_designator: NORMAL ANGLE, backface_corner_radius: 0.1250 INCHES NOMINAL IN, end_item_identification: AIRCRAFT MODEL A4. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0329, 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
8438-1
NSN: 3110-00-100-0329
FSC: 3110
CAGE: 23382 — FWD SEAGRAVE HOLDINGS LP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_width1.1250 INCHES NOMINAL IN
outside_diameter5.5115 INCHES NOMINAL IN
style_designatorNORMAL ANGLE
backface_corner_radius0.1250 INCHES NOMINAL IN
end_item_identificationAIRCRAFT MODEL A4
standard_tolerance_designationAFBMA CLASS 2
part_name_assigned_by_controlling_agencyBEARING,CUP OTR WHL
NSN3110-00-100-0329
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 8438-1 · 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
•
OUTSIDE DIAMETER: 5.5115 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: NORMAL ANGLE
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER5.5115 INCHES NOMINAL IN
OVERALL WIDTH1.1250 INCHES NOMINAL IN
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYBEARING,CUP OTR WHL
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
MATERIALSTEEL OVERALL
STYLE DESIGNATORNORMAL ANGLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
85112186Interchangeable
interchangeable cross-reference
interchangeable
FFS92Interchangeable
interchangeable cross-reference
interchangeable
101026Interchangeable
interchangeable cross-reference
interchangeable
A20-1AInterchangeable
interchangeable cross-reference
interchangeable
2105-3Interchangeable
interchangeable cross-reference
interchangeable
A20-1ABInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8438-1?
8438-1 is a OSCILLATOR,NONCRYSTAL CONTROLLED.
What parts can replace 8438-1?
There are 27 known substitutes for 8438-1: 85112186, FFS92, 101026 and 24 more. Substitute compatibility should be verified for your specific system.
Is 8438-1 still available?
8438-1 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026