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561-6404326-6 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

561-6404326-6: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: COPPER ALLOY 462 OR COPPER ALLOY 464 OR COPPER ALLOY 482 OR COPPER ALLOY 485, design_type: SPLIT, end_diameter: 1.1320 INCHES MINIMUM AND 1.1370 INCHES MAXIMUM IN, bore_diameter: 0.7500 INCHES MINIMUM AND 0.7520 INCHES MAXIMUM IN, style_designator: SEAT, first_step_length: 1.1600 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-377-9140, 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
561-6404326-6
NSN: 5340-01-377-9140
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY 462 OR COPPER ALLOY 464 OR COPPER ALLOY 482 OR COPPER ALLOY 485
design_typeSPLIT
end_diameter1.1320 INCHES MINIMUM AND 1.1370 INCHES MAXIMUM IN
bore_diameter0.7500 INCHES MINIMUM AND 0.7520 INCHES MAXIMUM IN
style_designatorSEAT
first_step_length1.1600 INCHES NOMINAL IN
first_step_diameter1.3750 INCHES NOMINAL IN
second_step_diameter2.2500 INCHES NOMINAL IN
distance_from_end_to_first_step1.0200 INCHES NOMINAL IN
material_document_and_classificationQQ-B-637, 1/2H FED SPEC SINGLE MATERIAL RESPONSE
NSN5340-01-377-9140
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 561-6404326-6 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: 1.3750 INCHES NOMINAL IN
•
END DIAMETER: 1.1320 INCHES MINIMUM AND 1.1370 INCHES MAXIMUM IN
•
DISTANCE FROM END TO FIRST STEP: 1.0200 INCHES NOMINAL IN
•
DESIGN TYPE: SPLIT
•
STYLE DESIGNATOR: SEAT
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-637, 1/2H FED SPEC SINGLE MATERIAL RESPONSE
•
SECOND STEP DIAMETER: 2.2500 INCHES NOMINAL IN
•
FIRST STEP LENGTH: 1.1600 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FIRST STEP DIAMETER1.3750 INCHES NOMINAL IN
END DIAMETER1.1320 INCHES MINIMUM AND 1.1370 INCHES MAXIMUM IN
DISTANCE FROM END TO FIRST STEP1.0200 INCHES NOMINAL IN
DESIGN TYPESPLIT
STYLE DESIGNATORSEAT
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-637, 1/2H FED SPEC SINGLE MATERIAL RESPONSE
SECOND STEP DIAMETER2.2500 INCHES NOMINAL IN
FIRST STEP LENGTH1.1600 INCHES NOMINAL IN
BORE DIAMETER0.7500 INCHES MINIMUM AND 0.7520 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY 462 OR COPPER ALLOY 464 OR COPPER ALLOY 482 OR COPPER ALLOY 485
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

No substitute or cross-reference records for this part.

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 561-6404326-6?
561-6404326-6 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for 561-6404326-6?
561-6404326-6 is cataloged in the U.S. Government catalog under NSN 5340-01-377-9140. 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.