Cross reference · MS (US military standards) · Extended washer self-locking nut
MS21042 cross referenceSPS FN12A
MS21042 is a extended washer self-locking nut series on 18 government stock numbers. Its closest equivalents are SPS FN12A. Each one is labeled with how strong the evidence is.
- Issued by MS
- Item Extended washer self-locking nut
- Stock numbers 18
- Equivalents 21
- DLA paid $0.20 to $1.65
Equivalents in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
- FN12ASPS TechnologiesCatalog only, needs approvalon 6 of 18 stock numbers, 6 sizes
- MN16Hi-ShearCatalog only, needs approvalon 4 of 18 stock numbers, 4 sizes
- RM22LHESNACatalog only, needs approvalon 2 of 18 stock numbers, 2 sizes
9 more on one stock number each: 38FM, FN12, FN12AA, FN12ALA, FN12M, H10X, H14L02CW, H14L04CW, H14L06CW
- 38FMSPS TechnologiesCatalog only, needs approvalon 1 of 18 stock numbers
- FN12SPS TechnologiesCatalog only, needs approvalon 1 of 18 stock numbers
- FN12AASPS TechnologiesCatalog only, needs approvalon 1 of 18 stock numbers
- FN12ALASPS TechnologiesCatalog only, needs approvalon 1 of 18 stock numbers
- FN12MSPS TechnologiesCatalog only, needs approvalon 1 of 18 stock numbers
- H10XHowmet Fastening SystemsCatalog only, needs approvalon 1 of 18 stock numbers
- H14L02CWHowmet Fastening SystemsCatalog only, needs approvalon 1 of 18 stock numbers
- H14L04CWHowmet Fastening SystemsCatalog only, needs approvalon 1 of 18 stock numbers
- H14L06CWHowmet Fastening SystemsCatalog only, needs approvalon 1 of 18 stock numbers
Standards
- NAS1291XNASCatalog only, needs approvalon 3 of 18 stock numbers, 3 sizes
- NAS679XNASCatalog only, needs approvalon 2 of 18 stock numbers
- AN364ANCatalog only, needs approvalon 2 of 18 stock numbers, 2 sizes
4 more on one stock number each: NAS1291, NAS679A, NASM21042, AN364C
Airframer and OEM drawings
2 more on one stock number each: AS8600E, GN510B
- AS8600ERolls-RoyceCatalog only, needs approvalon 1 of 18 stock numbers
- GN510BNorthrop GrummanCatalog only, needs approvalon 1 of 18 stock numbers
Plus 69 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).
Get quotes for MS21042
Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
SpecLok has no catalog family for MS21042. Tooling for the equivalents:
None of the equivalents is in the SpecLok catalog yet.
What the government paid
DLA awards on 9 of 18 stock numbers, 170 awards from 2023-01-03 to 2026-08-31.
Latest award per stock number: $0.20 to $1.65 each.
DLA production lead time: 56 to 467 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 | MS21042 | FN12A | MN16 | RM22LH | NAS1291X | AN364 | Last DLA price |
|---|---|---|---|---|---|---|---|
| 5310-00-058-1823 | MS21042-02 | FN12A-26 | RM22LH1660-26 | $1.35 2026-06 | |||
| 5310-00-807-1467 | MS21042-3 | MN16-3 | NAS1291X3 | $0.20 2026-08 | |||
| 5310-00-811-6419 | MS21042-04 | FN12A-40 | RM22LH1660-40 | $0.30 2026-06 | |||
| 5310-01-497-8362 | MS21042-4 | ||||||
| 5310-01-628-4949 | MS21042-4 | ||||||
| 5310-00-807-1469 | MS21042-5 | FN12A054 | $0.68 2026-05 | ||||
| 5310-01-693-5379 | MS21042-5 | AN364-524A | |||||
| 5310-00-807-1465 | MS21042-06 | FN12A-62 | MN16-06 | AN364-632C | $1.03 2026-01 | ||
| 5310-00-877-9298 | MS21042-06 | ||||||
| 5310-00-810-1786 | MS21042-6 | FN12A-064 | NAS1291X6 | $0.69 2026-04 | |||
| 5310-01-338-3911 | MS21042-6 | $1.65 2025-08 | |||||
| 5310-01-556-7347 | MS21042-7 | ||||||
| 5310-00-807-1466 | MS21042-08 | MN16-08 | NAS1291X08 | $0.29 2026-07 | |||
| 5310-01-568-6872 | MS21042-43 | ||||||
| 5310-00-807-1468 | MS21042-428 | FN12A-048 | MN16-4 | $0.20 2026-06 |
Show 3 more sizes
| NSN | MS21042 | FN12A | MN16 | RM22LH | NAS1291X | AN364 | Last DLA price |
|---|---|---|---|---|---|---|---|
| 5310-01-621-2503 | MS21042-3(MOD) | ||||||
| 5310-01-137-5231 | MS21042-6MOD | ||||||
| 5310-00-807-1476 | MS21042-L5 |
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.
Next · 3 Quote
Quote MS21042 or an equivalent
Get quotes adds the part and its install tooling to your quote. Check another part number in the cross reference.