Cross reference · ESNA · Plate self-locking nut

RMLHTA51 cross referenceSPS 12700E, Howmet K1001, MS21048L

RMLHTA51 is a ESNA plate self-locking nut series on 8 government stock numbers. Its closest equivalents are SPS 12700E, Howmet K1001, MS21048L. 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

  • 12700ESPS TechnologiesCatalog only, needs approvalon 6 of 8 stock numbers, 6 sizes
  • K1001Howmet Fastening SystemsCatalog only, needs approvalon 5 of 8 stock numbers, 5 sizes
10 more on one stock number each: 12600NM, BR2000C3M, K49587, NS103202SE, NS103714, R2000C04M, R2000C06M, R2000C08M, R2000C3M, R2000C3MK
  • 12600NMSPS TechnologiesCatalog only, needs approvalon 1 of 8 stock numbers
  • BR2000C3MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 8 stock numbers
  • K49587Howmet Fastening SystemsCatalog only, needs approvalon 1 of 8 stock numbers
  • NS103202SESPS TechnologiesCatalog only, needs approvalon 1 of 8 stock numbers
  • NS103714SPS TechnologiesCatalog only, needs approvalon 1 of 8 stock numbers
  • R2000C04MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 8 stock numbers
  • R2000C06MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 8 stock numbers
  • R2000C08MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 8 stock numbers
  • R2000C3MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 8 stock numbers
  • R2000C3MKHowmet Fastening SystemsCatalog only, needs approvalon 1 of 8 stock numbers

Standards

  • MS21048LMSCatalog only, needs approvalon 5 of 8 stock numbers, 4 sizes
  • NASM21048NASCatalog only, needs approvalon 3 of 8 stock numbers
  • NASM21048LNASCatalog only, needs approvalon 2 of 8 stock numbers, 2 sizes
6 more on one stock number each: MS21048L3K, NAS680A, NAS680C08M, NASM25027, MS21048, MS21048L3W
  • MS21048L3KMSCatalog only, needs approvalon 1 of 8 stock numbers
  • NAS680ANASCatalog only, needs approvalon 1 of 8 stock numbers
  • NAS680C08MNASCatalog only, needs approvalon 1 of 8 stock numbers
  • NASM25027NASCatalog only, needs approvalon 1 of 8 stock numbers
  • MS21048MSCatalog only, needs approvalon 1 of 8 stock numbers
  • MS21048L3WMSCatalog only, needs approvalon 1 of 8 stock numbers

Airframer and OEM drawings

    2 more on one stock number each: BACN10JR3CM, Z00N
    • BACN10JR3CMBoeingCatalog only, needs approvalon 1 of 8 stock numbers
    • Z00NDaherCatalog only, needs approvalon 1 of 8 stock numbers

    Plus 5 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).

    Get quotes for RMLHTA51

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

    Install tooling

    SpecLok has no catalog family for RMLHTA51. Tooling for the equivalents:

    What the government paid

    DLA awards on 3 of 8 stock numbers, 6 awards from 2023-02-13 to 2026-05-18.

    Latest award per stock number: $1.17 to $80.00 each.

    DLA production lead time: 33 to 230 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 RMLHTA51 and its equivalents, by stock number
    NSNRMLHTA5112700EK1001MS21048LNASM21048BACN10JR3CMLast DLA price
    5310-00-582-5529RMLHTA51-02
    5310-00-782-7094RMLHTA51-2860-0212700E-02K1001-3BACMS21048L3BACN10JR3CM
    5310-00-766-6649RMLHTA51-2860-4012700E-40K1001-04MS21048L04
    5310-00-766-6651RMLHTA51-2860-04812700E-048MS21048L4NASM21048$1.17 2025-08
    5310-00-766-6652RMLHTA51-2860-6212700E-62K1001-06MS21048L06NASM21048
    5310-00-766-6653RMLHTA51-2860-8212700E-82K1001-08MS21048L08NASM21048$1.64 2026-05
    5310-00-776-1935RMLHTA51-2860-02BC12700E-02BCK1001-3BC$80.00 2026-03
    5310-00-208-2400RMLHTA51-2860P-02

    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 5310 Nuts and washers. Issuer names are SpecLok's reading of the filing CAGE code; distributors are not named. Compiled 2026-10-02.

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