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HC121 — SPRING,HELICAL,EXTENSION

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

HC121: SPRING,HELICAL,EXTENSION.

The SPRING,HELICAL,EXTENSION is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, end_style: MACHINE LOOP BOTH ENDS, design_type: CLOSED, hook_radius: 0.438 INCHES NOMINAL BOTH ENDS IN, coil_quantity: 48, opening_width: 0.375 INCHES NOMINAL BOTH ENDS IN. This part is cataloged in the U.S.

Government catalog under NSN 5360-01-214-0065, 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
HC121
NSN: 5360-01-214-0065
FSC: 5360 — Coil, Flat, Leaf, and Wire Springs
CAGE: 2Y614 — LINK-BELT CRANES, L.P., LLLP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
end_styleMACHINE LOOP BOTH ENDS
design_typeCLOSED
hook_radius0.438 INCHES NOMINAL BOTH ENDS IN
coil_quantity48
opening_width0.375 INCHES NOMINAL BOTH ENDS IN
inside_diameter0.750 INCHES NOMINAL IN
style_designatorCYLINDRICAL
spring_free_length8.000 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND OR LEFT-HAND
coil_to_hook_inside_length0.813 INCHES NOMINAL BOTH ENDS IN
spring_free_outside_diameter1.000 INCHES NOMINAL IN
NSN5360-01-214-0065
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPRING,HELICAL,EXTENSION TITLE COMPONENT PN HC121 MFR SPRING,HELICAL,EXTENSI
KEY FEATURES
•
SPRING FREE OUTSIDE DIAMETER: 1.000 INCHES NOMINAL IN
•
END STYLE: MACHINE LOOP BOTH ENDS
•
DESIGN TYPE: CLOSED
•
STYLE DESIGNATOR: CYLINDRICAL
•
OPENING WIDTH: 0.375 INCHES NOMINAL BOTH ENDS IN
•
SPRING FREE LENGTH: 8.000 INCHES NOMINAL IN
•
COIL TO HOOK INSIDE LENGTH: 0.813 INCHES NOMINAL BOTH ENDS IN
•
INSIDE DIAMETER: 0.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SPRING FREE OUTSIDE DIAMETER1.000 INCHES NOMINAL IN
END STYLEMACHINE LOOP BOTH ENDS
DESIGN TYPECLOSED
STYLE DESIGNATORCYLINDRICAL
OPENING WIDTH0.375 INCHES NOMINAL BOTH ENDS IN
SPRING FREE LENGTH8.000 INCHES NOMINAL IN
COIL TO HOOK INSIDE LENGTH0.813 INCHES NOMINAL BOTH ENDS IN
INSIDE DIAMETER0.750 INCHES NOMINAL IN
COIL QUANTITY48
COIL HELIX DIRECTIONRIGHT-HAND OR LEFT-HAND
OTHER ITEMS IN FSC 5360 — Coil, Flat, Leaf, and Wire Springs
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5360-00-001-1842 5360-00-001-1945 5360-00-001-2010 5360-00-001-3865 5360-00-001-3950 5360-00-001-4650 5360-00-001-4664 5360-00-001-4703
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 HC121?
HC121 is a SPRING,HELICAL,EXTENSION.
What is the NSN for HC121?
HC121 is cataloged in the U.S. Government catalog under NSN 5360-01-214-0065. 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.