National Stock Number
5920-00-521-8331
National Stock Number (NSN) 5920-00-521-8331, or NIIN 005218331, (block,telephone protector) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN replaces 2 stock numbers: 5920005107666, 5920005458188.
There are 7 manufacturer part numbers associated with this NSN. 5 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 7 suppliers. Today, 3 suppliers are listed as Active suppliers 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 assigned to Item Name Code (INC) 00311. [AN ITEM DESIGNED TO BE USED WITH OTHER SIMILAR ITEMS IN AN ELECTRICAL CIRCUIT TO FORM AN OPEN-SPACE CUT-OUT FOR PROTECTION AGAINST HIGH POTENTIALS, SUCH AS LIGHTNING AND/OR ABNORMAL ELECTRIC CURRENTS. IT IS A MAINTENANCE PART FOR A PROTECTOR, TELEPHONE.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no information in the HMIRS; however, the NSN is in an FSC in Table II of Federal Standard 313 and an MSDS may be required by the user. The requirement for an MSDS is dependent on a hazard determination of the supplier or the intended end use of the product. NSN 5920005218331 contains an unknown precious metal.
This NSN is associated to Schedule B 8535400000: lightning arrestors, voltage limiters and surge suppressors, for voltage exceeding 1000 v. The Schedule B End Use is listed as electric apparatus. NAICS classification category 334417: electronic connector manufacturing.
This information was last updated on Aug 01, 2025.