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A5259 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A5259: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: ALUMINUM ALLOY, design_type: SOLID, end_diameter: 0.3000 INCHES MINIMUM AND 0.3200 INCHES MAXIMUM IN, bore_diameter: 0.2480 INCHES MINIMUM AND 0.2520 INCHES MAXIMUM IN, overall_height: 0.1600 INCHES MINIMUM AND 0.1800 INCHES MAXIMUM IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-050-7571, 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
A5259
NSN: 5340-00-050-7571
FSC: 5340 — Hardware, Commercial
CAGE: 55469 — ESSEX INDUSTRIES, INC. DBA ESSEX INDUSTRIES (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
design_typeSOLID
end_diameter0.3000 INCHES MINIMUM AND 0.3200 INCHES MAXIMUM IN
bore_diameter0.2480 INCHES MINIMUM AND 0.2520 INCHES MAXIMUM IN
overall_height0.1600 INCHES MINIMUM AND 0.1800 INCHES MAXIMUM IN
style_designatorSEAT
surface_treatmentANODIZE
first_step_diameter0.4300 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN
countersink_diameter0.3730 INCHES NOMINAL IN
countersink_angle_in_deg45.0
distance_from_end_to_first_step0.1210 INCHES NOMINAL IN
surface_treatment_document_and_classificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE
NSN5340-00-050-7571
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A5259 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: 45.0
•
FIRST STEP DIAMETER: 0.4300 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN
•
END DIAMETER: 0.3000 INCHES MINIMUM AND 0.3200 INCHES MAXIMUM IN
•
COUNTERSINK DIAMETER: 0.3730 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE
•
DISTANCE FROM END TO FIRST STEP: 0.1210 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.1600 INCHES MINIMUM AND 0.1800 INCHES MAXIMUM IN
COUNTERSINK ANGLE IN DEG45.0
FIRST STEP DIAMETER0.4300 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN
END DIAMETER0.3000 INCHES MINIMUM AND 0.3200 INCHES MAXIMUM IN
COUNTERSINK DIAMETER0.3730 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE
DISTANCE FROM END TO FIRST STEP0.1210 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
SURFACE TREATMENTANODIZE
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 A5259?
A5259 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for A5259?
A5259 is cataloged in the U.S. Government catalog under NSN 5340-00-050-7571. 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.