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JC1491 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

JC1491: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL COMP 1018, design_type: SOLID, end_diameter: 0.4060 INCHES MINIMUM AND 0.4110 INCHES MAXIMUM IN, bore_diameter: 0.3140 INCHES MINIMUM AND 0.3190 INCHES MAXIMUM IN, overall_height: 0.5000 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-200-1567, 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
JC1491
NSN: 5340-01-200-1567
FSC: 5340 — Hardware, Commercial
CAGE: 2Y614 — LINK-BELT CRANES, L.P., LLLP (USA)
SPECIFICATIONS
materialSTEEL COMP 1018
design_typeSOLID
end_diameter0.4060 INCHES MINIMUM AND 0.4110 INCHES MAXIMUM IN
bore_diameter0.3140 INCHES MINIMUM AND 0.3190 INCHES MAXIMUM IN
overall_height0.5000 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN
style_designatorSEAT
first_step_diameter1.0620 INCHES NOMINAL IN
chamfer_angle_in_deg20.0
countersink_diameter0.3760 INCHES NOMINAL IN
countersink_angle_in_deg45.0
distance_from_end_to_first_step0.3850 INCHES NOMINAL IN
material_document_and_classificationLB921003, COMP 1018, FSCM 36422 MFR REF SINGLE MATERIAL RESPONSE
NSN5340-01-200-1567
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: JC1491 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: 1.0620 INCHES NOMINAL IN
•
END DIAMETER: 0.4060 INCHES MINIMUM AND 0.4110 INCHES MAXIMUM IN
•
COUNTERSINK DIAMETER: 0.3760 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.3850 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.5000 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN
COUNTERSINK ANGLE IN DEG45.0
FIRST STEP DIAMETER1.0620 INCHES NOMINAL IN
END DIAMETER0.4060 INCHES MINIMUM AND 0.4110 INCHES MAXIMUM IN
COUNTERSINK DIAMETER0.3760 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.3850 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
MATERIAL DOCUMENT AND CLASSIFICATIONLB921003, COMP 1018, FSCM 36422 MFR REF SINGLE MATERIAL RESPONSE
CHAMFER ANGLE IN DEG20.0
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: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is JC1491?
JC1491 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for JC1491?
JC1491 is cataloged in the U.S. Government catalog under NSN 5340-01-200-1567. 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.