Cross reference · Northrop Grumman · Retaining ring

CL21A cross referenceTruarc N5002, MS16631

CL21A is a Northrop retaining ring series on 8 government stock numbers. Its closest equivalents are Truarc N5002, MS16631. Each one is labeled with how strong the evidence is.

Equivalents in the government catalog

8 stock numbers

Catalog-only listings need engineering approval before you substitute.

Manufacturers

  • N5002TruarcCatalog only, needs approvalon 4 of 8 stock numbers, 5 sizes
5 more on one stock number each: HC848Y, N1300, N1401, N5000, SH18BC
  • HC848YHuckCatalog only, needs approvalon 1 of 8 stock numbers
  • N1300TruarcCatalog only, needs approvalon 1 of 8 stock numbers
  • N1401TruarcCatalog only, needs approvalon 1 of 8 stock numbers, 2 sizes
  • N5000TruarcCatalog only, needs approvalon 1 of 8 stock numbers
  • SH18BCRotor ClipCatalog only, needs approvalon 1 of 8 stock numbers

Standards

  • MS16631MSCatalog only, needs approvalon 4 of 8 stock numbers, 5 sizes
7 more on one stock number each: NAS50, NAS51, MS16624, MS16625, MS16627, MS16628, MS9012
  • NAS50NASCatalog only, needs approvalon 1 of 8 stock numbers
  • NAS51NASCatalog only, needs approvalon 1 of 8 stock numbers
  • MS16624MSCatalog only, needs approvalon 1 of 8 stock numbers, 2 sizes
  • MS16625MSCatalog only, needs approvalon 1 of 8 stock numbers
  • MS16627MSCatalog only, needs approvalon 1 of 8 stock numbers
  • MS16628MSCatalog only, needs approvalon 1 of 8 stock numbers, 2 sizes
  • MS9012MSCatalog only, needs approvalon 1 of 8 stock numbers

Airframer and OEM drawings

    7 more on one stock number each: 12Z64PC, 242B, 7W61027FE, A03983, SMB207780, T9160475PC, TER18BE
    • 12Z64PCUS NavyCatalog only, needs approvalon 1 of 8 stock numbers
    • 242BGeneral DynamicsCatalog only, needs approvalon 1 of 8 stock numbers
    • 7W61027FELockheed MartinCatalog only, needs approvalon 1 of 8 stock numbers
    • A03983MBDACatalog only, needs approvalon 1 of 8 stock numbers
    • SMB207780US ArmyCatalog only, needs approvalon 1 of 8 stock numbers
    • T9160475PCGECatalog only, needs approvalon 1 of 8 stock numbers
    • TER18BEHoneywellCatalog only, needs approvalon 1 of 8 stock numbers

    Plus 53 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).

    Get quotes for CL21A

    Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.

    Install tooling

    SpecLok has no catalog family for CL21A. Tooling for the equivalents:

    None of the equivalents is in the SpecLok catalog yet.

    What the government paid

    DLA awards on 1 of 8 stock numbers, 8 awards from 2023-01-20 to 2026-08-27.

    Latest award per stock number: $21.54 each.

    DLA production lead time: 51 to 222 days.

    Per size in the table below.

    DLA prices at DLA quantities, not a quote.Source

    DLA award prices at DLA quantities and terms, not a commercial quote. Each award may bundle packaging, delivery and inspection terms that a commercial buy does not. Vendors are shown by CAGE code only.

    Source: DLA FOIA Electronic Reading Room ↗, public FOIA releases. Files: 2023ContHist.zip/2023ContractHistory.txt, 2024ContHist.zip/2024ContractHistory.txt, contracthist2025.zip/contracthist2025.txt, 2026-09-16-1038_contracthist.zip/2026-09-16-1038_contracthist.txt.

    Sizes by maker

    8 stock numbers
    Part numbers DLA FLIS lists for CL21A and its equivalents, by stock number
    NSNCL21AN5002HC848YSH18BCMS16631NAS50Last DLA price
    5325-00-255-4616CL21A7591-56N5002-231MDMS16631-1231
    5325-00-804-2771CL21A7591-72NAS50-250$21.54 2026-08
    5325-00-903-7567CL21A7591-92HC848Y188SH-18BC
    5325-00-256-2853CL21A7591-113
    5325-00-252-6864CL21A7591-164N5002-112SMDMS16631-1112
    5325-00-663-2379CL21A7591-186
    5325-00-255-4619CL21A7591-196N5002-165MDMS16631-1165
    5325-00-255-4615CL21A7591-252N5002-187MDMS16631-1187

    Each row is one National Stock Number and the part numbers DLA FLIS lists on it, as written there. A blank means FLIS lists no part in that series on the stock number, not that the size does not exist.

    Sources and how to read this page.Details

    Reference numbers the Federal Logistics Information System records against the same National Stock Number. A supply-catalog cross-reference, not an engineering-approved interchangeability: confirm against the controlling drawing or spec before substituting. Only equivalents marked cited have a manufacturer or government document, linked with each.

    Source: DLA Federal Logistics Information System, via DLA PUB LOG ↗ (FLIS Data Electronic Reading Room ↗), data as of 2025-03-18 (March 2025 snapshot). Federal supply class 5325 Fastening devices. Issuer names are SpecLok's reading of the filing CAGE code; distributors are not named. Compiled 2026-10-02.

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