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4040240 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4040240: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SPLIT, bore_diameter: 0.3900 INCHES NOMINAL IN, overall_height: 0.2970 INCHES NOMINAL IN, features_provided: CASEHARDENED, first_step_diameter: 1.2500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-349-7452, 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
4040240
NSN: 5340-00-349-7452
FSC: 5340 — Hardware, Commercial
CAGE: 6N299 — AGCO CORP PARTS OPN (USA)
SPECIFICATIONS
materialSTEEL
design_typeSPLIT
bore_diameter0.3900 INCHES NOMINAL IN
overall_height0.2970 INCHES NOMINAL IN
features_providedCASEHARDENED
first_step_diameter1.2500 INCHES NOMINAL IN
second_end_diameter0.9140 INCHES NOMINAL IN
distance_from_end_to_first_step0.1080 INCHES NOMINAL IN
NSN5340-00-349-7452
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4040240 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: 1.2500 INCHES NOMINAL IN
•
SECOND END DIAMETER: 0.9140 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.1080 INCHES NOMINAL IN
•
DESIGN TYPE: SPLIT
•
FEATURES PROVIDED: CASEHARDENED
•
BORE DIAMETER: 0.3900 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.2970 INCHES NOMINAL IN
FIRST STEP DIAMETER1.2500 INCHES NOMINAL IN
SECOND END DIAMETER0.9140 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.1080 INCHES NOMINAL IN
DESIGN TYPESPLIT
FEATURES PROVIDEDCASEHARDENED
BORE DIAMETER0.3900 INCHES NOMINAL IN
MATERIALSTEEL
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 2
GU7692Reference document
Same NSN cross-reference
Reference document — Secondary reference
79-GU402592Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4040240?
4040240 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 4040240?
There are 2 known substitutes for 4040240: GU7692, 79-GU402592. Substitute compatibility should be verified for your specific system.
What is the NSN for 4040240?
4040240 is cataloged in the U.S. Government catalog under NSN 5340-00-349-7452. 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.