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BB19811 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

BB19811: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.3360 INCHES NOMINAL IN, bore_diameter: 0.2500 INCHES NOMINAL IN, overall_height: 0.2880 INCHES NOMINAL IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-356-1334, 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
BB19811
NSN: 5340-00-356-1334
FSC: 5340 — Hardware, Commercial
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.3360 INCHES NOMINAL IN
bore_diameter0.2500 INCHES NOMINAL IN
overall_height0.2880 INCHES NOMINAL IN
style_designatorSEAT
features_providedCASEHARDENED
first_step_length0.1210 INCHES NOMINAL IN
counterbore_length0.0960 INCHES NOMINAL IN
first_step_diameter0.6250 INCHES NOMINAL IN
counterbore_diameter0.5250 INCHES NOMINAL IN
fsc_application_dataGASOLINE,RECIPROCATING ENGINE,EXCEPT AIRCRAFT PRIME MOVING AND STARTING ENGINE TYPES
NSN5340-00-356-1334
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: BB19811 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FSC APPLICATION DATA: GASOLINE,RECIPROCATING ENGINE,EXCEPT AIRCRAFT PRIME MOVING AND STARTING ENGINE TYPES
•
FIRST STEP DIAMETER: 0.6250 INCHES NOMINAL IN
•
END DIAMETER: 0.3360 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.0510 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
COUNTERBORE LENGTH: 0.0960 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.2880 INCHES NOMINAL IN
FSC APPLICATION DATAGASOLINE,RECIPROCATING ENGINE,EXCEPT AIRCRAFT PRIME MOVING AND STARTING ENGINE TYPES
FIRST STEP DIAMETER0.6250 INCHES NOMINAL IN
END DIAMETER0.3360 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.0510 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
COUNTERBORE LENGTH0.0960 INCHES NOMINAL IN
FEATURES PROVIDEDCASEHARDENED
SECOND STEP DIAMETER0.7810 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
7406544Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
23184Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BB19811?
BB19811 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace BB19811?
There are 2 known substitutes for BB19811: 7406544, 23184. Substitute compatibility should be verified for your specific system.
What is the NSN for BB19811?
BB19811 is cataloged in the U.S. Government catalog under NSN 5340-00-356-1334. 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.