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PartsTable / COMPONENT / B21373
B21373 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The SPRING,HELICAL,TORSION is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, end_style: STRAIGHT OFFSET OVERALL, end_length: 0.125 INCHES NOMINAL BOTH ENDS IN, coil_quantity: 7-1/2, inside_diameter: 0.393 INCHES NOMINAL IN, style_designator: SINGLE TORSION LEFT HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5360-00-316-4490, 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
B21373
NSN: 5360-00-316-4490
FSC: 5360
CAGE: 92208 — LITTON SYSTEMS INC ITEK OPTICAL SYSTEMS DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
end_styleSTRAIGHT OFFSET OVERALL
end_length0.125 INCHES NOMINAL BOTH ENDS IN
coil_quantity7-1/2
inside_diameter0.393 INCHES NOMINAL IN
style_designatorSINGLE TORSION LEFT HAND
spring_free_length1.031 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND
end_angular_relationshipENDS ANGLED ONE TO OTHER
spring_free_outside_diameter0.495 INCHES NOMINAL IN
material_document_and_classificationMIL-W-6101 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5360-00-316-4490
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPRING,HELICAL,TORSION TITLE COMPONENT PN B21373 MFR SPRING,HELICAL,TORSION
KEY FEATURES
•
SPRING FREE OUTSIDE DIAMETER: 0.495 INCHES NOMINAL IN
•
END STYLE: STRAIGHT OFFSET OVERALL
•
INSIDE DIAMETER: 0.393 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-W-6101 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
COIL QUANTITY: 7-1/2
•
END ANGULAR RELATIONSHIP: ENDS ANGLED ONE TO OTHER
•
STYLE DESIGNATOR: SINGLE TORSION LEFT HAND
TECHNICAL CHARACTERISTICS (FLIS)
SPRING FREE OUTSIDE DIAMETER0.495 INCHES NOMINAL IN
END STYLESTRAIGHT OFFSET OVERALL
INSIDE DIAMETER0.393 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-W-6101 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
COIL QUANTITY7-1/2
END ANGULAR RELATIONSHIPENDS ANGLED ONE TO OTHER
STYLE DESIGNATORSINGLE TORSION LEFT HAND
SPRING FREE LENGTH1.031 INCHES NOMINAL IN
COIL HELIX DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
84126Interchangeable
interchangeable cross-reference
interchangeable
196094Interchangeable
interchangeable cross-reference
interchangeable
BP2025Interchangeable
interchangeable cross-reference
interchangeable
84104 ITEM 14Interchangeable
interchangeable cross-reference
interchangeable
206-372Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B21373?
B21373 is a SPRING,HELICAL,TORSION.
What parts can replace B21373?
There are 5 known substitutes for B21373: 84126, 196094, BP2025 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B21373?
B21373 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5360-00-316-4490. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026