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7653291-1 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

7653291-1: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: PLASTIC, end_diameter: 0.5200 INCHES NOMINAL IN, overall_height: 0.1800 INCHES NOMINAL IN, style_designator: SEAT, counterbore_length: 0.0300 INCHES NOMINAL IN, first_step_diameter: 0.6400 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-541-2961, 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
7653291-1
NSN: 5340-01-541-2961
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialPLASTIC
end_diameter0.5200 INCHES NOMINAL IN
overall_height0.1800 INCHES NOMINAL IN
style_designatorSEAT
counterbore_length0.0300 INCHES NOMINAL IN
first_step_diameter0.6400 INCHES NOMINAL IN
countersink_diameter0.2530 INCHES MINIMUM AND 0.2610 INCHES MAXIMUM IN
end_item_identificationMK16 MOD 0, UNDERWATER BREATHING APPARATUS (NSW)
part_name_assigned_by_controlling_agencySEAT,SPRING
NSN5340-01-541-2961
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 7653291-1 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: 0.6400 INCHES NOMINAL IN
•
END DIAMETER: 0.5200 INCHES NOMINAL IN
•
COUNTERSINK DIAMETER: 0.2530 INCHES MINIMUM AND 0.2610 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SEAT
•
COUNTERBORE LENGTH: 0.0300 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.1800 INCHES NOMINAL IN
FIRST STEP DIAMETER0.6400 INCHES NOMINAL IN
END DIAMETER0.5200 INCHES NOMINAL IN
COUNTERSINK DIAMETER0.2530 INCHES MINIMUM AND 0.2610 INCHES MAXIMUM IN
STYLE DESIGNATORSEAT
COUNTERBORE LENGTH0.0300 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYSEAT,SPRING
END ITEM IDENTIFICATIONMK16 MOD 0, UNDERWATER BREATHING APPARATUS (NSW)
MATERIALPLASTIC
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: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 7653291-1?
7653291-1 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for 7653291-1?
7653291-1 is cataloged in the U.S. Government catalog under NSN 5340-01-541-2961. 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.