Cross reference · Howmet Fastening Systems · Plate self-locking nut
RM300X cross referenceSPS M12620NM, ESNA F52LHTA55M, MS21073
RM300X is a Howmet plate self-locking nut series on 5 government stock numbers. Its closest equivalents are SPS M12620NM, ESNA F52LHTA55M, MS21073. Each one is labeled with how strong the evidence is.
- Issued by Howmet Fastening Systems
- Item Plate self-locking nut
- Stock numbers 5
- Equivalents 9
- DLA paid $0.62 to $5.99
Equivalents in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
- M12620NMSPS TechnologiesCatalog only, needs approvalon 4 of 5 stock numbers, 4 sizes
- F52LHTA55MESNACatalog only, needs approvalon 3 of 5 stock numbers, 3 sizes
6 more on one stock number each: MA12620NM, MT7S1032CPC, MT7S428CPC, MT7S524CPC, MT7S832CPC, MTL7S632CPC
- MA12620NMSPS TechnologiesCatalog only, needs approvalon 1 of 5 stock numbers
- MT7S1032CPCCherry AerospaceCatalog only, needs approvalon 1 of 5 stock numbers
- MT7S428CPCCherry AerospaceCatalog only, needs approvalon 1 of 5 stock numbers
- MT7S524CPCCherry AerospaceCatalog only, needs approvalon 1 of 5 stock numbers
- MT7S832CPCCherry AerospaceCatalog only, needs approvalon 1 of 5 stock numbers
- MTL7S632CPCCherry AerospaceCatalog only, needs approvalon 1 of 5 stock numbers
Standards
- MS21073MSCatalog only, needs approvalon 5 of 5 stock numbers, 5 sizes
Plus 2 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).
Get quotes for RM300X
Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
SpecLok has no catalog family for RM300X. Tooling for the equivalents:
None of the equivalents is in the SpecLok catalog yet.
What the government paid
DLA awards on 3 of 5 stock numbers, 4 awards from 2024-05-17 to 2026-06-16.
Latest award per stock number: $0.62 to $5.99 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 | RM300X | M12620NM | F52LHTA55M | MT7S1032CPC | MS21073 | Last DLA price |
|---|---|---|---|---|---|---|
| 5310-00-761-3712 | RM300X3 | M12620NM-02 | F52LHTA55M-02 | MT7S1032CPC | MS21073-3 | $0.62 2026-06 |
| 5310-00-761-3711 | RM300X4 | M12620NM-048 | F52LHTA55M-048 | MS21073-4 | ||
| 5310-00-761-3710 | RM300X5 | MS21073-5 | $5.99 2025-03 | |||
| 5310-00-761-3714 | RM300X06 | M12620NM-62 | MS21073-06 | $1.16 2026-01 | ||
| 5310-00-761-3713 | RM300X08 | M12620NM-82 | F52LHTA55M-82 | MS21073-08 |
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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