Cross reference · Howmet Fastening Systems · Pin-rivet
HL645Y cross referenceHi-Shear HL645LL, SPS AICL644, Boeing ST3M456C
HL645Y is a Howmet pin-rivet series on 3 government stock numbers. Its closest equivalents are Hi-Shear HL645LL, SPS AICL644, Boeing ST3M456C. Each one is labeled with how strong the evidence is.
- Issued by Howmet Fastening Systems
- Item Pin-rivet
- Stock numbers 3
- Equivalents 9
Equivalents in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
- HL645LLHi-ShearCatalog only, needs approvalon 3 of 3 stock numbers, 3 sizes
- HL645YEHi-ShearCatalog only, needs approvalon 3 of 3 stock numbers, 3 sizes
- AICL644SPS TechnologiesCatalog only, needs approvalon 3 of 3 stock numbers, 3 sizes
- AICL645SPS TechnologiesCatalog only, needs approvalon 3 of 3 stock numbers, 3 sizes
Airframer and OEM drawings
- ST3M456CBoeingCatalog only, needs approvalon 3 of 3 stock numbers, 3 sizes
Plus 2 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).
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Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
Hi-Lok tooling (hex key (holds the pin) and collar driver (howmet hi-lok system))
Sizes by maker
| NSN | HL645Y | HL645LL | AICL644 | ST3M456C | Last DLA price |
|---|---|---|---|---|---|
| 5320-00-325-2851 | HL645Y3-6-6 | HL645LL-6-6 | AIC-L-644-3-6 | ST3M456C3-6 | |
| 5320-00-367-6885 | HL645Y3-10-9 | HL645LL-10-9 | AIC-L-644-5-9 | ST3M456C5-9 | |
| 5320-00-325-2832 | HL645Y-8-9 | HL645LL-8-9 | AIC-L-644-4-9 | ST3M456C4-9 |
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 5320 Rivets. Issuer names are SpecLok's reading of the filing CAGE code; distributors are not named. Compiled 2026-10-02.
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