Cross reference · General Dynamics · Hexagon self-locking nut

G525 cross referenceAvibank BLC4B17S, Hartwell LGRCB1700, Space-Lok SLC4AB, MS17828

G525 is a General hexagon self-locking nut series on 4 government stock numbers. Its closest equivalents are Avibank BLC4B17S, Hartwell LGRCB1700, Space-Lok SLC4AB, MS17828. Each one is labeled with how strong the evidence is.

Equivalents in the government catalog

4 stock numbers

Catalog-only listings need engineering approval before you substitute.

Manufacturers

    4 more on one stock number each: BLC4B17S, BLC4B17SM, LGRCB1700, SLC4AB
    • BLC4B17SAvibankCatalog only, needs approvalon 1 of 4 stock numbers
    • BLC4B17SMAvibankCatalog only, needs approvalon 1 of 4 stock numbers
    • LGRCB1700HartwellCatalog only, needs approvalon 1 of 4 stock numbers
    • SLC4ABSpace-LokCatalog only, needs approvalon 1 of 4 stock numbers

    Standards

    • MS17828MSCatalog only, needs approvalon 2 of 4 stock numbers, 4 sizes
    4 more on one stock number each: NASM17828, NASM25027/MIL, MS17984C, MS25027/1
    • NASM17828NASCatalog only, needs approvalon 1 of 4 stock numbers, 2 sizes
    • NASM25027/MILNASCatalog only, needs approvalon 1 of 4 stock numbers
    • MS17984CMSCatalog only, needs approvalon 1 of 4 stock numbers
    • MS25027/1MSCatalog only, needs approvalon 1 of 4 stock numbers, 2 sizes

    Airframer and OEM drawings

    • 7384908PNUS NavyCatalog only, needs approvalon 2 of 4 stock numbers, 3 sizes
    • 7384912PNUS NavyCatalog only, needs approvalon 2 of 4 stock numbers, 2 sizes
    • 7384913PNUS NavyCatalog only, needs approvalon 2 of 4 stock numbers, 2 sizes
    9 more on one stock number each: 218001641FD, 218017968FD, 218017969D, 218017969FAD, 218017969FBD, 218017969FD, 21807969FAD, 7384567PN, 7384567PN172D
    • 218001641FDUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 218017968FDUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 218017969DUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 218017969FADUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 218017969FBDUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 218017969FDUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 21807969FADUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 7384567PNUS NavyCatalog only, needs approvalon 1 of 4 stock numbers
    • 7384567PN172DUS NavyCatalog only, needs approvalon 1 of 4 stock numbers

    Plus 30 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).

    Get quotes for G525

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

    Install tooling

    SpecLok has no catalog family for G525. Tooling for the equivalents:

    None of the equivalents is in the SpecLok catalog yet.

    What the government paid

    DLA awards on 1 of 4 stock numbers, 18 awards from 2023-05-15 to 2026-01-16.

    Latest award per stock number: $19.12 each.

    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

    4 stock numbers
    Part numbers DLA FLIS lists for G525 and its equivalents, by stock number
    NSNG525BLC4B17SLGRCB1700SLC4ABMS17828NASM17828Last DLA price
    5310-01-540-9547G525-4201-PN22D4
    5310-01-670-3380G525-5201PN1D4MS17828-08CD4
    5310-01-649-6995G525-5301PN13D4MS17828-4CD4NASM17828-4CD4
    5315-00-151-5893G525-5301PN25BLC4B17SLGRCB1700SLC4AB17$19.12 2026-01

    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 classes 5310 Nuts and washers, 5315 Nails, machine keys and pins. Issuer names are SpecLok's reading of the filing CAGE code; distributors are not named. Compiled 2026-10-02.

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