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B21504 — SPRING,HELICAL,TORSION

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

B21504: SPRING,HELICAL,TORSION.

The SPRING,HELICAL,TORSION is a the manufacturer industrial component. Key specifications include material: STEEL UNS K08500 OVERALL, end_style: STRAIGHT OFFSET OVERALL, end_length: 0.250 INCHES NOMINAL BOTH ENDS IN, coil_quantity: 4-1/2, inside_diameter: 0.391 INCHES NOMINAL IN, style_designator: SINGLE TORSION RIGHT HAND. This part is cataloged in the U.S.

Government catalog under NSN 5360-00-316-4497, 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
B21504
NSN: 5360-00-316-4497
FSC: 5360 — Coil, Flat, Leaf, and Wire Springs
CAGE: 92208 — LITTON SYSTEMS INC ITEK OPTICAL SYSTEMS DIV (USA)
SPECIFICATIONS
materialSTEEL UNS K08500 OVERALL
end_styleSTRAIGHT OFFSET OVERALL
end_length0.250 INCHES NOMINAL BOTH ENDS IN
coil_quantity4-1/2
inside_diameter0.391 INCHES NOMINAL IN
style_designatorSINGLE TORSION RIGHT HAND
spring_free_length0.797 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND
end_angular_relationshipENDS ANGLED ONE TO OTHER
spring_free_outside_diameter0.516 INCHES NOMINAL IN
NSN5360-00-316-4497
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPRING,HELICAL,TORSION TITLE COMPONENT PN B21504 MFR SPRING,HELICAL,TORSION
KEY FEATURES
•
SPRING FREE OUTSIDE DIAMETER: 0.516 INCHES NOMINAL IN
•
END STYLE: STRAIGHT OFFSET OVERALL
•
END LENGTH: 0.250 INCHES NOMINAL BOTH ENDS IN
•
STYLE DESIGNATOR: SINGLE TORSION RIGHT HAND
•
SPRING FREE LENGTH: 0.797 INCHES NOMINAL IN
•
INSIDE DIAMETER: 0.391 INCHES NOMINAL IN
•
COIL QUANTITY: 4-1/2
•
COIL HELIX DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
SPRING FREE OUTSIDE DIAMETER0.516 INCHES NOMINAL IN
END STYLESTRAIGHT OFFSET OVERALL
END LENGTH0.250 INCHES NOMINAL BOTH ENDS IN
STYLE DESIGNATORSINGLE TORSION RIGHT HAND
SPRING FREE LENGTH0.797 INCHES NOMINAL IN
INSIDE DIAMETER0.391 INCHES NOMINAL IN
COIL QUANTITY4-1/2
COIL HELIX DIRECTIONRIGHT-HAND
MATERIALSTEEL UNS K08500 OVERALL
END ANGULAR RELATIONSHIPENDS ANGLED ONE TO OTHER
SUBSTITUTES & CROSS-REFERENCES 2
979-1B397Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
9234-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B21504?
B21504 is a SPRING,HELICAL,TORSION.
What parts can replace B21504?
There are 2 known substitutes for B21504: 979-1B397, 9234-6. Substitute compatibility should be verified for your specific system.
What is the NSN for B21504?
B21504 is cataloged in the U.S. Government catalog under NSN 5360-00-316-4497. 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.