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21453001 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

21453001: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.6250 INCHES NOMINAL IN, bore_diameter: 0.5000 INCHES NOMINAL IN, overall_height: 0.4000 INCHES NOMINAL IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-388-4143, 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
21453001
NSN: 5340-01-388-4143
FSC: 5340 — Hardware, Commercial
CAGE: 09990 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV HYDRAULIC VALVE DIVISION (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.6250 INCHES NOMINAL IN
bore_diameter0.5000 INCHES NOMINAL IN
overall_height0.4000 INCHES NOMINAL IN
style_designatorSEAT
first_step_diameter0.9000 INCHES NOMINAL IN
spherical_seat_top_radius0.2730 INCHES NOMINAL IN
NSN5340-01-388-4143
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21453001 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: 0.9000 INCHES NOMINAL IN
•
END DIAMETER: 0.6250 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
SPHERICAL SEAT TOP RADIUS: 0.2730 INCHES NOMINAL IN
•
BORE DIAMETER: 0.5000 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.4000 INCHES NOMINAL IN
FIRST STEP DIAMETER0.9000 INCHES NOMINAL IN
END DIAMETER0.6250 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
SPHERICAL SEAT TOP RADIUS0.2730 INCHES NOMINAL IN
BORE DIAMETER0.5000 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

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 21453001?
21453001 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for 21453001?
21453001 is cataloged in the U.S. Government catalog under NSN 5340-01-388-4143. 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.