Cross reference · ANSI · Machine bolt

B1821 cross referenceASMEB1821

B1821 is a machine bolt series on 28 government stock numbers. Its closest equivalents are ASMEB1821. Each one is labeled with how strong the evidence is.

Equivalents in the government catalog

28 stock numbers

Catalog-only listings need engineering approval before you substitute.

Manufacturers

    1 more on one stock number each: AF65
    • AF65AllfastCatalog only, needs approvalon 1 of 28 stock numbers

    Standards

    • ASMEB1821ASMECatalog only, needs approvalon 17 of 28 stock numbers, 2 sizes
    • MS35355MSCatalog only, needs approvalon 13 of 28 stock numbers, 13 sizes
    • FFB575Federal specificationsCatalog only, needs approvalon 10 of 28 stock numbers, 2 sizes
    • FFB575TYFederal specificationsCatalog only, needs approvalon 8 of 28 stock numbers
    • FFS85Federal specificationsCatalog only, needs approvalon 7 of 28 stock numbers, 2 sizes
    • MS90726MSCatalog only, needs approvalon 5 of 28 stock numbers, 4 sizes
    • MS90725MSCatalog only, needs approvalon 4 of 28 stock numbers, 5 sizes
    • MS90727MSCatalog only, needs approvalon 4 of 28 stock numbers, 4 sizes
    • MS90728MSCatalog only, needs approvalon 4 of 28 stock numbers, 4 sizes
    • NASM90725NASCatalog only, needs approvalon 2 of 28 stock numbers, 2 sizes
    • NASM90726NASCatalog only, needs approvalon 2 of 28 stock numbers
    1 more on one stock number each: MS18154
    • MS18154MSCatalog only, needs approvalon 1 of 28 stock numbers

    Airframer and OEM drawings

      4 more on one stock number each: 11KP, 17KP, G1921BH025C063N, G1921BH031C063N
      • 11KPOshkoshCatalog only, needs approvalon 1 of 28 stock numbers
      • 17KPOshkoshCatalog only, needs approvalon 1 of 28 stock numbers
      • G1921BH025C063NGeneral DynamicsCatalog only, needs approvalon 1 of 28 stock numbers
      • G1921BH031C063NGeneral DynamicsCatalog only, needs approvalon 1 of 28 stock numbers

      Plus 96 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).

      Get quotes for B1821

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

      Install tooling

      SpecLok has no catalog family for B1821. Tooling for the equivalents:

      None of the equivalents is in the SpecLok catalog yet.

      What the government paid

      DLA awards on 5 of 28 stock numbers, 40 awards from 2023-11-04 to 2026-09-10.

      Latest award per stock number: $0.11 to $4.77 each.

      DLA production lead time: 25 to 285 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

      28 stock numbers
      Part numbers DLA FLIS lists for B1821 and its equivalents, by stock number
      NSNB1821ASMEB1821MS35355FFB575Last DLA price
      5306-00-226-4824B.18.2.1
      5305-00-068-0500B18.2.1ASMEB18.2.1
      5305-00-068-0504B18.2.1ASMEB18.2.1
      5305-00-068-7837B18.2.1
      5305-00-071-2071B18.2.1$0.27 2025-02
      5305-00-071-2233B18.2.1ASMEB18.2.1
      5305-00-105-4062B18.2.1
      5305-00-226-7768B18.2.1ASME-B18.2.1
      5305-00-267-8952B18.2.1$0.11 2023-12
      5305-00-269-3206B18.2.1ASMEB18.2.1
      5305-00-939-7063B18.2.1ASME-B18.2.1
      5305-00-948-0803B18.2.1$4.77 2026-09
      5305-00-958-9428B18.2.1
      5305-01-277-0458B18.2.1ASMEB18.2.1$1.65 2026-09
      5306-00-019-0882B18.2.1ASME-B18.2.1MS35355-69FF-B-575
      Show 13 more sizes
      More sizes
      NSNB1821ASMEB1821MS35355FFB575Last DLA price
      5306-00-042-6921B18.2.1ASMEB18.2.1MS35355-5FF-B-575
      5306-00-042-6922B18.2.1ASME-B18.2.1MS35355-7FFB575
      5306-00-042-6937B18.2.1ASME-B18.2.1MS35355-129FF-B-575
      5306-00-062-2711B18.2.1MS35355-6FF-B-575
      5306-00-226-4827B18.2.1$0.19 2026-06
      5306-00-527-4957B18.2.1ASME-B18.2.1MS35355-68
      5306-00-527-4958B18.2.1MS35355-67
      5306-00-550-3686B18.2.1ASMEB18.2.1MS35355-3FF-B-575
      5306-00-558-5419B18.2.1ASMEB18.2.1MS35355-162FF-B-575
      5306-00-639-4906B18.2.1ASMEB18.2.1MS35355-143
      5306-00-884-8785B18.2.1MS35355-34FF-B-575
      5306-00-958-0619B18.2.1ASME-B18.2.1MS35355-10FFB575
      5306-00-959-7818B18.2.1ASMEB18.2.1MS35355-159FF-B-575

      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 5305 Screws, 5306 Bolts. Issuer names are SpecLok's reading of the filing CAGE code; distributors are not named. Compiled 2026-10-02.

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