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1A74992 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1A74992: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.8750 INCHES NOMINAL IN, bore_diameter: 0.8110 INCHES NOMINAL IN, overall_height: 0.5630 INCHES NOMINAL IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-367-4591, 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
1A74992
NSN: 5340-00-367-4591
FSC: 5340 — Hardware, Commercial
CAGE: 23382 — FWD SEAGRAVE HOLDINGS LP (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.8750 INCHES NOMINAL IN
bore_diameter0.8110 INCHES NOMINAL IN
overall_height0.5630 INCHES NOMINAL IN
style_designatorSEAT
bore_taper_in_deg8.6
first_step_length0.1560 INCHES NOMINAL IN
second_step_length0.1560 INCHES NOMINAL IN
first_step_diameter1.7660 INCHES NOMINAL IN
third_step_diameter2.1250 INCHES NOMINAL IN
fsc_application_dataVALVE ASSEMBLY,GASOLINE RECIPROCATING ENGINE,NONAIRCRAFT
NSN5340-00-367-4591
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1A74992 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: VALVE ASSEMBLY,GASOLINE RECIPROCATING ENGINE,NONAIRCRAFT
•
FIRST STEP DIAMETER: 1.7660 INCHES NOMINAL IN
•
END DIAMETER: 0.8750 INCHES NOMINAL IN
•
THIRD STEP DIAMETER: 2.1250 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.2810 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
SECOND STEP LENGTH: 0.1560 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.5630 INCHES NOMINAL IN
FSC APPLICATION DATAVALVE ASSEMBLY,GASOLINE RECIPROCATING ENGINE,NONAIRCRAFT
FIRST STEP DIAMETER1.7660 INCHES NOMINAL IN
END DIAMETER0.8750 INCHES NOMINAL IN
THIRD STEP DIAMETER2.1250 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.2810 INCHES NOMINAL IN
DESIGN TYPESOLID
SECOND STEP LENGTH0.1560 INCHES NOMINAL IN
STYLE DESIGNATORSEAT
SECOND STEP DIAMETER2.5000 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 3
471A4Reference document
Same NSN cross-reference
Reference document — Secondary reference
74992Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5E6450Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1A74992?
1A74992 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 1A74992?
There are 3 known substitutes for 1A74992: 471A4, 74992, 5E6450. Substitute compatibility should be verified for your specific system.
What is the NSN for 1A74992?
1A74992 is cataloged in the U.S. Government catalog under NSN 5340-00-367-4591. 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.