Cross reference · MS (US military standards) · Plate self-locking nut
MS21051 cross referenceESNA F52LHTA, SPS 12610NM, Howmet R1000X
MS21051 is a plate self-locking nut series on 6 government stock numbers. Its closest equivalents are ESNA F52LHTA, SPS 12610NM, Howmet R1000X. Each one is labeled with how strong the evidence is.
- Issued by MS
- Item Plate self-locking nut
- Stock numbers 6
- Equivalents 9
- DLA paid $0.64
Equivalents in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
- F52LHTAESNACatalog only, needs approvalon 5 of 6 stock numbers, 5 sizes
- 12610NMSPS TechnologiesCatalog only, needs approvalon 4 of 6 stock numbers, 4 sizes
- R1000XHowmet Fastening SystemsCatalog only, needs approvalon 3 of 6 stock numbers, 3 sizes
4 more on one stock number each: K2000, R1000X3K, T12S, T12S832CPC
- K2000Howmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
- R1000X3KHowmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
- T12SCherry AerospaceCatalog only, needs approvalon 1 of 6 stock numbers
- T12S832CPCCherry AerospaceCatalog only, needs approvalon 1 of 6 stock numbers
Standards
1 more on one stock number each: NASM21051
- NASM21051NASCatalog only, needs approvalon 1 of 6 stock numbers
Airframer and OEM drawings
1 more on one stock number each: 59A5A
- 59A5AUS NavyCatalog only, needs approvalon 1 of 6 stock numbers
Get quotes for MS21051
Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
Self-locking nutplates (MS21047, MS21059, MS21069, MS21078; rivetless ForceTec) tooling (riveted: nutplate drill (two holes at once) and rivets per the design; rivetless forcetec: fti mandrel, split sleeve and puller)
Self-locking nutplates (MS21047, MS21059, MS21069, MS21078; rivetless ForceTec) in the catalog
What the government paid
DLA awards on 1 of 6 stock numbers, 1 awards from 2026-01-28 to 2026-01-28.
Latest award per stock number: $0.64 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
| NSN | MS21051 | F52LHTA | 12610NM | R1000X | T12S | NASM21051 | Last DLA price |
|---|---|---|---|---|---|---|---|
| 5310-00-774-9781 | MS21051-3 | F52LHTA57-02 | 12610NM-02 | R1000X3 | $0.64 2026-01 | ||
| 5310-00-774-9826 | MS21051-4 | F52LHTA57-048 | 12610NM-048 | R1000X4 | |||
| 5310-00-435-9144 | MS21051-06 | F52LHTA57-62 | 12610NM-62 | ||||
| 5310-00-774-9737 | MS21051-08 | F52LHTA57-82 | 12610NM-82 | R1000X08 | T12S832 | NASM21051 | |
| 5310-01-628-3310 | MS21051-08K | ||||||
| 5310-00-777-5831 | MS21051-3K | F52LHTA57-02BC |
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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