The Pin-Rivet, cataloged under National Stock Number 5320-01-388-3666, is classified within Federal Supply Class 5320 (Rivets) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 17 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5320-01-388-3666 |
| Primary Part Number | HLT51YB-8-3 |
| Item Name | Pin-Rivet |
| FSC / FSG | 5320 / 53 — Rivets |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Shank Diameter | 0.250 INCHES NOMINAL IN |
| Lubrication | CETYL ALCOHOL, SPEC 305, HI-SHEAR CORP |
| Fastener Length | 0.573 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Tip Diameter | 0.241 INCHES MINIMUM AND 0.244 INCHES MAXIMUM IN |
| Head Style | FLUSH COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Shank Style | PIN-RIVET, TAPERED, THREADED |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Major Diameter | 0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ST3M758C4-3 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HLT51YC-8-3 | West Coast Aerospace, Inc. (USA) |
| HLT51YC-8-3 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HLT51YB-8-3 | West Coast Aerospace, Inc. (USA) |
| HLT51YB-8-3 PRIMARY | Huck International, Inc (USA) |
| HLT51YB-8-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HLT51YC-8-3 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HP4758-4-3 | Heartland Precision Fasteners Inc (USA) |
| HLT51YC-8-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HLT51YB-8-3 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M758C4-3 PRIMARY | The Boeing Company Div Defense (USA) |
| HLT51YC-8-3 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HLT51YC-8-3 | Hi-Shear Corporation (USA) |
| HLT51YC-8-3 | Huck International, Inc (USA) |
| HLT51YB-8-3 | Hi-Shear Corporation (USA) |
| HLT51YB-8-3 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HLT51YB-8-3 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| Reference | Meaning |
|---|---|
| HLT51YB-8-3 | 5/2 Secondary reference U.S. Government activity |
| HLT51YB-8-3 | 5/9 Secondary reference U.S. Government activity |
| 10118949 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HLT51YC-8-3 | 5/2 Secondary reference U.S. Government activity |
| AIC-L-758C4-3 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| HLT51YC-8-3 | 5/2 Secondary reference U.S. Government activity |
| HLT51YB-8-3 | 5/2 Secondary reference U.S. Government activity |
| HLT51YC-8-3 | 5/9 Secondary reference U.S. Government activity |
NSN 5320-01-388-3666 is a Pin-Rivet, manufactured by Huck International, Inc, classified under FSC 5320, Rivets. Status: active.
NSN 5320-01-388-3666 has 17 manufacturer part numbers on file: ST3M758C4-3 (Fastener Innovation Technology, Inc. Dba F I T), HLT51YC-8-3 (West Coast Aerospace, Inc.), HLT51YC-8-3 (Sps Technologies Ltd, Tj Brooks Division), HLT51YB-8-3 (West Coast Aerospace, Inc.), HLT51YB-8-3 (Huck International, Inc) and 12 more.
Key specifications for HLT51YB-8-3: Shank Diameter: 0.250 INCHES NOMINAL IN; Lubrication: CETYL ALCOHOL, SPEC 305, HI-SHEAR CORP; Fastener Length: 0.573 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN; Material Document and Classification: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 15 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.