NSN 5360-00-331-2575, 5360003312575
SPRING,HELICAL,TORSION

Federal Supply Classification: FSC 5360 - Coil, Flat, Leaf, and Wire Springs
National Item Identification Number: NIIN 003312575
Codification Country: United States
Item Name Code: INC 04228
Criticality: (X) This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.
Hazardous Material Indicator Code: (N) There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials.

Availability: Readily Available Qualified Suppliers: Currently qualifying suppliers

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DLMS^® Summary

National Stock Number 5360-00-331-2575

National Stock Number (NSN) 5360-00-331-2575, or NIIN 003312575, (spring,helical,torsion) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.

There are 5 manufacturer part numbers associated with this NSN. 2 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by one supplier. Today, one supplier is listed as an Active supplier for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts.

This part number has not been procured by the US Government in over 5 years.

This NSN is unique to one weapons system.

Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Sep 30, 2011, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. The data needed to produce this item from additional sources is not physically available. Valid AMCs: 3, 4 and 5.

This NSN is assigned to Item Name Code (INC) 04228. [AN OPEN- OR CLOSE-WOUND COIL SPRING, CONSISTING OF ONE OR MORE HELICAL COILS WOUND FROM DIFFERENT SHAPES AND TYPES OF MATERIAL AND FINISHED AT THE ENDS, DESIGNED TO EXERT PRESSURE IN A ROTATING DIRECTION AROUND THE COIL AXIS. EXCLUDES:SPRINGS DESIGNED FOR THERMAL ACTUATION (SPRINGS IN WHICH THE TORSION FORCES ARE COUNTERACTED BY CHANGES IN TEMPERATURE) AND SPRING,REINFORCING,HOSE.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 5360003312575 does not contain precious metals.

This information was last updated on Aug 01, 2025.

Technical Characteristics

OFFSET LENGTH: (CKTH) UNABLE TO DECODE
END ANGULAR RELATIONSHIP: (AXMH) ENDS ANGLED ONE TO OTHER
COIL HELIX DIRECTION: (AXLH) LEFT-HAND
COIL QUANTITY: (APCN) 4-1/2
END LENGTH FROM FIRST BEND TO SECOND BEND OR END: (CXTN) 0.312 INCHES MINIMUM FIRST END
END LENGTH FROM FIRST BEND TO SECOND BEND OR END: (CXTN) 1.296 INCHES NOMINAL SECOND END
END LENGTH FROM SECOND BEND TO THIRD BEND OR END: (CXTP) 0.312 INCHES NOMINAL SECOND END
END LENGTH FROM SECOND BEND TO THIRD BEND OR END: (CXTP) 0.423 INCHES NOMINAL FIRST END
END LENGTH FROM THIRD BEND OR END: (CXTQ) 0.312 INCHES NOMINAL BOTH ENDS
END LENGTH: (CXTH) 1.000 INCHES NOMINAL FIRST END
END LENGTH: (CXTH) 1.250 INCHES NOMINAL SECOND END
END LENGTH FROM COIL AXIS TO FIRST BEND: (CXTM) 0.125 INCHES NOMINAL SECOND END
END LENGTH FROM COIL AXIS TO FIRST BEND: (CXTM) 0.926 INCHES NOMINAL FIRST END
END TANGENT ANGLE: (CXTS) 10.0 DEGREES NOMINAL
INSIDE DIAMETER: (AARX) 0.608 INCHES NOMINAL
MATERIAL: (MATT) STEEL OVERALL
OFFSET LENGTH: (CKTH) 0.625 INCHES NOMINAL BOTH ENDS
SPRING FREE LENGTH: (AGEK) 0.400 INCHES NOMINAL
SPRING FREE OUTSIDE DIAMETER: (AXLQ) 0.750 INCHES NOMINAL
STYLE DESIGNATOR: (STYL) SINGLE TORSION LEFT HAND
END LENGTH: (CXTH) UNABLE TO DECODE
ERR DEFAULT: (CKTH) ERR DEFAULT
END LENGTH FROM COIL AXIS TO FIRST BEND: (CXTM) UNABLE TO DECODE
END LENGTH FROM SECOND BEND TO THIRD BEND OR END: (CXTP) UNABLE TO DECODE
END LENGTH FROM FIRST BEND TO SECOND BEND OR END: (CXTN) UNABLE TO DECODE
MATERIAL: (MATT) UNABLE TO DECODE
END LENGTH FROM THIRD BEND OR END: (CXTQ) UNABLE TO DECODE