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788079-1 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

788079-1: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL UNS S21800, end_diameter: 0.3800 INCHES NOMINAL IN, first_step_diameter: 0.5910 INCHES MINIMUM AND 0.6010 INCHES MAXIMUM IN, second_end_diameter: 0.4290 INCHES MINIMUM AND 0.4390 INCHES MAXIMUM IN, counterbore_diameter: 0.3390 INCHES MINIMUM AND 0.3490 INCHES MAXIMUM IN, fsc_application_data: VALVE,PRESSURE REGULATOR. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-202-3312, 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
788079-1
NSN: 5340-01-202-3312
FSC: 5340 — Hardware, Commercial
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL UNS S21800
end_diameter0.3800 INCHES NOMINAL IN
first_step_diameter0.5910 INCHES MINIMUM AND 0.6010 INCHES MAXIMUM IN
second_end_diameter0.4290 INCHES MINIMUM AND 0.4390 INCHES MAXIMUM IN
counterbore_diameter0.3390 INCHES MINIMUM AND 0.3490 INCHES MAXIMUM IN
fsc_application_dataVALVE,PRESSURE REGULATOR
material_hardness_rating23.0 ROCKWELL C MAXIMUM
material_document_and_classificationUNS S21800 ASSN STD SINGLE MATERIAL RESPONSE
NSN5340-01-202-3312
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 788079-1 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
•
FSC APPLICATION DATA: VALVE,PRESSURE REGULATOR
•
FIRST STEP DIAMETER: 0.5910 INCHES MINIMUM AND 0.6010 INCHES MAXIMUM IN
•
MATERIAL HARDNESS RATING: 23.0 ROCKWELL C MAXIMUM
•
END DIAMETER: 0.3800 INCHES NOMINAL IN
•
SECOND END DIAMETER: 0.4290 INCHES MINIMUM AND 0.4390 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: UNS S21800 ASSN STD SINGLE MATERIAL RESPONSE
•
COUNTERBORE DIAMETER: 0.3390 INCHES MINIMUM AND 0.3490 INCHES MAXIMUM IN
•
MATERIAL: STEEL UNS S21800
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATAVALVE,PRESSURE REGULATOR
FIRST STEP DIAMETER0.5910 INCHES MINIMUM AND 0.6010 INCHES MAXIMUM IN
MATERIAL HARDNESS RATING23.0 ROCKWELL C MAXIMUM
END DIAMETER0.3800 INCHES NOMINAL IN
SECOND END DIAMETER0.4290 INCHES MINIMUM AND 0.4390 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONUNS S21800 ASSN STD SINGLE MATERIAL RESPONSE
COUNTERBORE DIAMETER0.3390 INCHES MINIMUM AND 0.3490 INCHES MAXIMUM IN
MATERIALSTEEL UNS S21800
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 788079-1?
788079-1 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for 788079-1?
788079-1 is cataloged in the U.S. Government catalog under NSN 5340-01-202-3312. 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.