Cross reference · ESNA · Plate self-locking nut
RMLHTA521 cross referenceSPS 13705E, Howmet F5001, MS21060L
RMLHTA521 is a ESNA plate self-locking nut series on 12 government stock numbers. Its closest equivalents are SPS 13705E, Howmet F5001, MS21060L. Each one is labeled with how strong the evidence is.
- Issued by ESNA
- Item Plate self-locking nut
- Stock numbers 12
- Equivalents 22
- DLA paid $0.62 to $6.18
Equivalents in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
- 13705ESPS TechnologiesCatalog only, needs approvalon 12 of 12 stock numbers, 12 sizes
- F5001Howmet Fastening SystemsCatalog only, needs approvalon 8 of 12 stock numbers, 8 sizes
10 more on one stock number each: RF200C04M, RF200C04MK, RF200C06M, RF200C06MK, RF200C08M, RF200C08MK, RF200C3M, RF200C3MK, RF200C4M, RF200C4MK
- RF200C04MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C04MKHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C06MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C06MKHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C08MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C08MKHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C3MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C3MKHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C4MHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
- RF200C4MKHowmet Fastening SystemsCatalog only, needs approvalon 1 of 12 stock numbers
Standards
- MS21060LMSCatalog only, needs approvalon 6 of 12 stock numbers, 5 sizes
8 more on one stock number each: NAS686C4M, NASM21060, MS21060, MS21060L06K, MS21060L08K, MS21060L3K, MS21060L4K, MS21060L5K
- NAS686C4MNASCatalog only, needs approvalon 1 of 12 stock numbers
- NASM21060NASCatalog only, needs approvalon 1 of 12 stock numbers
- MS21060MSCatalog only, needs approvalon 1 of 12 stock numbers
- MS21060L06KMSCatalog only, needs approvalon 1 of 12 stock numbers
- MS21060L08KMSCatalog only, needs approvalon 1 of 12 stock numbers
- MS21060L3KMSCatalog only, needs approvalon 1 of 12 stock numbers
- MS21060L4KMSCatalog only, needs approvalon 1 of 12 stock numbers
- MS21060L5KMSCatalog only, needs approvalon 1 of 12 stock numbers
Airframer and OEM drawings
1 more on one stock number each: Z00N
- Z00NDaherCatalog only, needs approvalon 1 of 12 stock numbers
Plus 3 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).
Get quotes for RMLHTA521
Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
SpecLok has no catalog family for RMLHTA521. Tooling for the equivalents:
None of the equivalents is in the SpecLok catalog yet.
What the government paid
DLA awards on 8 of 12 stock numbers, 72 awards from 2023-02-21 to 2026-04-28.
Latest award per stock number: $0.62 to $6.18 each.
DLA production lead time: 147 to 209 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
| NSN | RMLHTA521 | 13705E | F5001 | MS21060L | Last DLA price |
|---|---|---|---|---|---|
| 5310-00-779-6625 | RMLHTA521-2860-02 | 13705E-02 | MS21060L3 | $1.38 2026-04 | |
| 5310-00-779-6757 | RMLHTA521-2860-40 | 13705E-40 | F5001-04 | MS21060L04 | $2.06 2026-02 |
| 5310-00-779-6689 | RMLHTA521-2860-048 | 13705E-048 | MS21060L4 | $3.10 2026-04 | |
| 5310-00-779-6636 | RMLHTA521-2860-054 | 13705E-054 | F5001-5 | MS21060L5 | $6.18 2025-12 |
| 5310-00-779-6750 | RMLHTA521-2860-62 | 13705E-62 | MS21060L06 | ||
| 5310-00-779-6737 | RMLHTA521-2860-82 | 13705E-82 | F5001-08 | MS21060L08 | $0.74 2023-12 |
| 5310-00-779-6735 | RMLHTA521-2860-02BC | 13705E-02BC | $0.62 2023-07 | ||
| 5310-00-779-6651 | RMLHTA521-2860-048BC | 13705E-048BC | F5001-4BC | $3.44 2026-01 | |
| 5310-01-056-3540 | RMLHTA521-2860-054BC | 13705E-054BC | F5001-5BC | ||
| 5310-01-079-5172 | RMLHTA521-2860-40BC | 13705E-40BC | F5001-04BC | ||
| 5310-00-779-6743 | RMLHTA521-2860-62BC | 13705E-62BC | F5001-06BC | ||
| 5310-00-779-6736 | RMLHTA521-2860-82BC | 13705E-82BC | F5001-08BC | $0.90 2024-06 |
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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