Cross reference · Boeing · Locked in stud
BACS21S cross referenceHowmet SF121
BACS21S is a Boeing locked in stud series on 13 government stock numbers. It is cross-referenced to Howmet SF121. Each one is labeled with how strong the evidence is.
- Issued by Boeing
- Item Locked in stud
- Stock numbers 13
- Cross-referenced series 7
Series in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
- SF121Howmet Fastening SystemsCatalog only, needs approvalon 4 of 13 stock numbers, 4 sizes
- SF111Howmet Fastening SystemsCatalog only, needs approvalon 3 of 13 stock numbers, 3 sizes
- SF91Howmet Fastening SystemsCatalog only, needs approvalon 3 of 13 stock numbers, 3 sizes
- SF101Howmet Fastening SystemsCatalog only, needs approvalon 2 of 13 stock numbers, 2 sizes
2 more on one stock number each: BA10253, SF141
- BA10253Howmet Fastening SystemsCatalog only, needs approvalon 1 of 13 stock numbers
- SF141Howmet Fastening SystemsCatalog only, needs approvalon 1 of 13 stock numbers
Standards
1 more on one stock number each: MS51989
- MS51989MSCatalog only, needs approvalon 1 of 13 stock numbers
Plus 23 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).
Get quotes for BACS21S
Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
SpecLok has no catalog family for BACS21S. Tooling for the cross-referenced series:
None of these series is in the SpecLok catalog yet.
Sizes by maker
| NSN | BACS21S | SF121 | Last DLA price |
|---|---|---|---|
| 5307-00-025-8306 | BACS21S12-1 | ||
| 5307-00-025-8294 | BACS21S11-16A | ||
| 5307-00-025-8295 | BACS21S11-18A | ||
| 5307-00-025-8297 | BACS21S11-21A | ||
| 5307-00-025-8300 | BACS21S12-13A | SF121-12SA13A | |
| 5307-00-025-8302 | BACS21S12-16A | SF121-12SA16A | |
| 5307-00-271-8651 | BACS21S12-18A | SF121-12SA18A | |
| 5307-00-207-5852 | BACS21S12-20A | SF121-12SA20A | |
| 5307-00-145-1746 | BACS21S9-12A | ||
| 5307-00-264-2562 | BACS21S9-14A | ||
| 5307-00-638-2748 | BACS21S9-15A | ||
| 5307-00-025-8268 | BACS21S9-7A | ||
| 5307-00-025-8269 | BACS21S9-8A |
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 5307 Studs. Issuer names are SpecLok's reading of the filing CAGE code; distributors are not named. Compiled 2026-10-02.
Reference only: the controlling drawing, its process spec and the manufacturer's installation instructions govern. How to use these answers
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Quote BACS21S or an equivalent
Get quotes adds the part and its install tooling to your quote. Check another part number in the cross reference.