NSN 5310-01-022-1801, 5310010221801
NUT,SELF-LOCKING,CASTELLATED,HEX

Federal Supply Classification: FSC 5310 - Nuts and Washers
National Item Identification Number: NIIN 010221801
Codification Country: United States
Item Name Code: INC 29725
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 5310-01-022-1801

National Stock Number (NSN) 5310-01-022-1801, or NIIN 010221801, (nut,self-locking,castellated,hex) was assigned May 26, 1976 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.

There is only one manufacturer part number associated with this NSN. One of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 3 suppliers. Today, 3 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, 2 suppliers are deemed design controlled or valid supply parts.

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

Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Jul 15, 2014, 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 annual buy value of this part falls below the screening threshold of $10,000 but it has been screened for known source(s). (NOTE: This code shall not be used when screening parts entering the inventory. It shall not be assigned in preference to or supersede any other AMSC.) Valid AMCs: 1, 2, 3, 4 and 5.

This NSN is assigned to Item Name Code (INC) 29725. [A NUT HAVING 6 FLAT SIDES, FLAT ON THE BOTTOM AND HAVING A SLOTTED CYLINDRICAL OR DOME SHAPED UPPER PORTION. AN INTEGRAL FEATURE IS INCORPORATED FOR LOCKING ON THE THREADS OF A MATING MEMBER. THE SLOTS WHEN USED IN CONJUNCTION WITH A SOLID OR SPLIT (COTTER) PIN, ACT AS AN EXTRA "FAIL SAFE" FEATURE IN CRITICAL APPLICATIONS. EXCLUDES:NUT (1), SELF-LOCKING, SLOTTED, HEXAGON.]. 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 5310010221801 does not contain precious metals.

This information was last updated on May 01, 2025.