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518-4674792 ITEM 6 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

518-4674792 ITEM 6: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: COPPER ALLOY 642, design_type: SOLID, end_diameter: 1.2700 INCHES NOMINAL IN, overall_height: 0.3750 INCHES NOMINAL IN, seat_angle_in_deg: 30.0, first_step_diameter: 2.0300 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-156-5294, 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
518-4674792 ITEM 6
NSN: 5340-01-156-5294
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY 642
design_typeSOLID
end_diameter1.2700 INCHES NOMINAL IN
overall_height0.3750 INCHES NOMINAL IN
seat_angle_in_deg30.0
first_step_diameter2.0300 INCHES NOMINAL IN
material_document_and_classificationQQ-C-465,ALLOY 642 FED SPEC SINGLE MATERIAL RESPONSE
NSN5340-01-156-5294
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 518-4674792 ITEM 6 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
•
FIRST STEP DIAMETER: 2.0300 INCHES NOMINAL IN
•
END DIAMETER: 1.2700 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 30.0
•
DESIGN TYPE: SOLID
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-465,ALLOY 642 FED SPEC SINGLE MATERIAL RESPONSE
•
MATERIAL: COPPER ALLOY 642
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.3750 INCHES NOMINAL IN
FIRST STEP DIAMETER2.0300 INCHES NOMINAL IN
END DIAMETER1.2700 INCHES NOMINAL IN
SEAT ANGLE IN DEG30.0
DESIGN TYPESOLID
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-465,ALLOY 642 FED SPEC SINGLE MATERIAL RESPONSE
MATERIALCOPPER ALLOY 642
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 1
518-4674792 ITEReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 518-4674792 ITEM 6?
518-4674792 ITEM 6 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 518-4674792 ITEM 6?
There is 1 known substitute for 518-4674792 ITEM 6: 518-4674792 ITE. Substitute compatibility should be verified for your specific system.
What is the NSN for 518-4674792 ITEM 6?
518-4674792 ITEM 6 is cataloged in the U.S. Government catalog under NSN 5340-01-156-5294. 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.