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R55909 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

R55909: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL COMP 1018, design_type: SOLID, end_diameter: 0.4300 INCHES NOMINAL IN, overall_height: 0.6100 INCHES NOMINAL IN, style_designator: SEAT, surface_treatment: CADMIUM. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-264-6102, 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
R55909
NSN: 5340-01-264-6102
FSC: 5340 — Hardware, Commercial
CAGE: 75160 — DEERE & CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1018
design_typeSOLID
end_diameter0.4300 INCHES NOMINAL IN
overall_height0.6100 INCHES NOMINAL IN
style_designatorSEAT
surface_treatmentCADMIUM
counterbore_length0.0800 INCHES NOMINAL IN
first_step_diameter0.7500 INCHES NOMINAL IN
countersink_angle_in_deg30.0
distance_from_end_to_first_step0.3900 INCHES NOMINAL IN
material_document_and_classificationAISI 1018 ASSN STD SINGLE MATERIAL RESPONSE
NSN5340-01-264-6102
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: R55909 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: 30.0
•
FIRST STEP DIAMETER: 0.7500 INCHES NOMINAL IN
•
END DIAMETER: 0.4300 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.3900 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI 1018 ASSN STD SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.6100 INCHES NOMINAL IN
COUNTERSINK ANGLE IN DEG30.0
FIRST STEP DIAMETER0.7500 INCHES NOMINAL IN
END DIAMETER0.4300 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.3900 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 1018 ASSN STD SINGLE MATERIAL RESPONSE
COUNTERBORE LENGTH0.0800 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is R55909?
R55909 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for R55909?
R55909 is cataloged in the U.S. Government catalog under NSN 5340-01-264-6102. 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.