Cross reference · Howmet Fastening Systems · Pin-rivet

HLT631YB cross referenceHi-Shear HL645LL, SPS AICL645, Boeing HP4758D

HLT631YB is a Howmet pin-rivet series on 5 government stock numbers. Its closest equivalents are Hi-Shear HL645LL, SPS AICL645, Boeing HP4758D. Each one is labeled with how strong the evidence is.

Equivalents in the government catalog

5 stock numbers

Catalog-only listings need engineering approval before you substitute.

Manufacturers

  • HL645LLHi-ShearCatalog only, needs approvalon 5 of 5 stock numbers, 5 sizes
  • HL645YEHi-ShearCatalog only, needs approvalon 5 of 5 stock numbers, 5 sizes
  • AICL645SPS TechnologiesCatalog only, needs approvalon 5 of 5 stock numbers, 8 sizes
  • HLT631YCSPS TechnologiesCatalog only, needs approvalon 4 of 5 stock numbers, 4 sizes
1 more on one stock number each: AICL644
  • AICL644SPS TechnologiesCatalog only, needs approvalon 1 of 5 stock numbers

Airframer and OEM drawings

  • HP4758DBoeingCatalog only, needs approvalon 5 of 5 stock numbers, 5 sizes
  • ST3M758DBoeingCatalog only, needs approvalon 5 of 5 stock numbers, 5 sizes
  • ST3M456CBoeingCatalog only, needs approvalon 4 of 5 stock numbers, 4 sizes
2 more on one stock number each: AICL771, HLT631TB
  • AICL771BoeingCatalog only, needs approvalon 1 of 5 stock numbers
  • HLT631TBBoeingCatalog only, needs approvalon 1 of 5 stock numbers

Plus 4 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

SpecLok has no catalog family for HLT631YB. Tooling for the equivalents:

Sizes by maker

5 stock numbers
Part numbers DLA FLIS lists for HLT631YB and its equivalents, by stock number
NSNHLT631YBHL645LLAICL645HP4758DLast DLA price
5320-00-367-6743HLT631YB-8-3HL645LL-8-3AIC-L-645-4-3HP4758D4-3
5320-00-367-6740HLT631YB-8-14HL645LL-8-14AIC-L-645-4-14HP4758D4-14
5320-01-135-4186HLT631YB-12-10HL645LL-12-10AIC-L-645-12-10HP4758D6-10
5320-00-393-4082HLT631YB-12-17HL645LL12-17AIC-L-645-12-17HP4758D6-17
5320-00-367-6885HLT631YB10-9ANDHLT631YC10-9HL645LL-10-9AIC-L-645-10-9HP4758D5-9

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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