The Pin-Rivet, cataloged under National Stock Number 5320-01-477-5631, 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 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5320-01-477-5631 |
| Primary Part Number | HLT631YB-8-9 |
| Item Name | Pin-Rivet |
| FSC / FSG | 5320 / 53 — Rivets |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Shank Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Fastener Length | 0.948 INCHES MINIMUM AND 0.968 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Head Style | FLUSH COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Grip Length | 0.558 INCHES MINIMUM AND 0.568 INCHES MAXIMUM IN |
| Width Between Flats | 0.122 INCHES MINIMUM AND 0.142 INCHES MAXIMUM IN |
| Shank Style | PIN-RIVET, STRAIGHT, THREADED |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Major Diameter | 0.3898 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| HLT631YB-8-9 PRIMARY | Huck International, Inc (USA) |
| HLT631YB-8-9 | West Coast Aerospace, Inc. (USA) |
| HLT631YC-8-9 PRIMARY | Hi-Shear Corporation (USA) |
| HLT631YC-8-9 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HLT631YB-8-9 PRIMARY | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HLT631YB-8-9 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HLT631YC-8-9 | West Coast Aerospace, Inc. (USA) |
| HLT631YC-8-9 PRIMARY | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HLT631YC-8-9 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M578D4-9 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HLT631YB-8-9 PRIMARY | Hi-Shear Corporation (USA) |
| HLT631YB-8-9 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HP4758D4-9 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| HLT631YC-8-9 PRIMARY | Huck International, Inc (USA) |
| ST3M758D4-9 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HLT631YB-8-9 | 3/2 Design control — primary reference U.S. Government activity |
| HLT631YB-8-9 | 3/2 Design control — primary reference U.S. Government activity |
| HLT631YC-8-9 | 3/2 Design control — primary reference U.S. Government activity |
| HLT631YC-8-9 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5320-01-477-5631 is a Pin-Rivet, manufactured by Huck International, Inc, classified under FSC 5320, Rivets. Status: active.
NSN 5320-01-477-5631 has 15 manufacturer part numbers on file: HLT631YB-8-9 (Huck International, Inc), HLT631YB-8-9 (West Coast Aerospace, Inc.), HLT631YC-8-9 (Hi-Shear Corporation), HLT631YC-8-9 (Sps Technologies, Llc Dba PB Fasteners), HLT631YB-8-9 (Sps Technologies Ltd, Tj Brooks Division) and 10 more.
Key specifications for HLT631YB-8-9: Shank Diameter: 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN; Fastener Length: 0.948 INCHES MINIMUM AND 0.968 INCHES MAXIMUM IN; Material Document and Classification: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Head Style: FLUSH COUNTERSUNK. 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.