PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 438
438 ✓ 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 SWITCH ASSEMBLY,SPEED is a the manufacturer industrial component. Key specifications include shape: TEARDROP, material: METAL CONTAINER/CARTRIDGE, cup_width: 0.8750 INCHES NOMINAL IN, stem_type: NONRISING, base_style: SUB-MINIATURE TWO PIN, bulb_style: T (TUBULAR). This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-3619, 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
438
NSN: 3110-00-100-3619
FSC: 3110
CAGE: 61361 — REXWORKS INC (USA)
SPECIFICATIONS
shapeTEARDROP
materialMETAL CONTAINER/CARTRIDGE
cup_width0.8750 INCHES NOMINAL IN
stem_typeNONRISING
base_styleSUB-MINIATURE TWO PIN
bulb_styleT (TUBULAR)
cone_width1.4219 INCHES NOMINAL IN
valve_size0.750 INCHES IN
bonnet_typeINSIDE SCREW
design_typeLIMITED
pin_diameter0.312 INCHES NOMINAL IN
shank_length1.469 INCHES MINIMUM AND 1.531 INCHES MAXIMUM IN
NSN3110-00-100-3619
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 438 · 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
•
MATERIAL: STEEL OVERALL
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
BORE DIAMETER: 3.8750 INCHES NOMINAL IN
•
CONE WIDTH: 1.4219 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1406 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NORMAL ANGLE
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BORE DIAMETER3.8750 INCHES NOMINAL IN
CONE WIDTH1.4219 INCHES NOMINAL IN
CONE CORNER RADIUS0.1406 INCHES NOMINAL IN
STYLE DESIGNATORNORMAL ANGLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
438-432Interchangeable
interchangeable cross-reference
interchangeable
FF-B-187AInterchangeable
interchangeable cross-reference
interchangeable
43-8Interchangeable
interchangeable cross-reference
interchangeable
5315-7-2B2-00Interchangeable
interchangeable cross-reference
interchangeable
5315-7-2B1-50Interchangeable
interchangeable cross-reference
interchangeable
370Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 438?
438 is a SWITCH ASSEMBLY,SPEED.
What parts can replace 438?
There are 21 known substitutes for 438: 438-432, FF-B-187A, 43-8 and 18 more. Substitute compatibility should be verified for your specific system.
Is 438 still available?
438 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026