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3-50381-1 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3-50381-1: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.7500 INCHES NOMINAL IN, bore_diameter: 0.6400 INCHES MINIMUM AND 0.6450 INCHES MAXIMUM IN, overall_height: 0.4250 INCHES MINIMUM AND 0.4350 INCHES MAXIMUM IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-995-6705, 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
3-50381-1
NSN: 5340-00-995-6705
FSC: 5340 — Hardware, Commercial
CAGE: 79U29 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.7500 INCHES NOMINAL IN
bore_diameter0.6400 INCHES MINIMUM AND 0.6450 INCHES MAXIMUM IN
overall_height0.4250 INCHES MINIMUM AND 0.4350 INCHES MAXIMUM IN
style_designatorSEAT
surface_treatmentPASSIVATE
first_step_diameter1.0000 INCHES NOMINAL IN
chamfer_angle_in_deg15.0
countersink_diameter0.7020 INCHES MINIMUM AND 0.7070 INCHES MAXIMUM IN
fsc_application_dataVALVE,DIVERTER,STARTING AIR
countersink_angle_in_deg15.0
NSN5340-00-995-6705
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3-50381-1 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
•
COUNTERSINK ANGLE IN DEG: 15.0
•
FSC APPLICATION DATA: VALVE,DIVERTER,STARTING AIR
•
FIRST STEP DIAMETER: 1.0000 INCHES NOMINAL IN
•
END DIAMETER: 0.7500 INCHES NOMINAL IN
•
COUNTERSINK DIAMETER: 0.7020 INCHES MINIMUM AND 0.7070 INCHES MAXIMUM IN
•
DISTANCE FROM END TO FIRST STEP: 0.3600 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.4250 INCHES MINIMUM AND 0.4350 INCHES MAXIMUM IN
COUNTERSINK ANGLE IN DEG15.0
FSC APPLICATION DATAVALVE,DIVERTER,STARTING AIR
FIRST STEP DIAMETER1.0000 INCHES NOMINAL IN
END DIAMETER0.7500 INCHES NOMINAL IN
COUNTERSINK DIAMETER0.7020 INCHES MINIMUM AND 0.7070 INCHES MAXIMUM IN
DISTANCE FROM END TO FIRST STEP0.3600 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
SURFACE TREATMENTPASSIVATE
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 3-50381-1?
3-50381-1 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for 3-50381-1?
3-50381-1 is cataloged in the U.S. Government catalog under NSN 5340-00-995-6705. 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.