The Pin-Rivet, cataloged under National Stock Number 5320-01-581-4657, is classified within Federal Supply Class 5320 (Rivets) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5320-01-581-4657 |
| Primary Part Number | VLB257-4A8 |
| Item Name | Pin-Rivet |
| FSC / FSG | 5320 / 53 — Rivets |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Shank Diameter | 0.125 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASM-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Material Document and Classification | ASM 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Head Style | FLUSH COUNTERSUNK |
| Grip Length | 0.500 INCHES NOMINAL IN |
| Shank Style | STUMP |
| Surface Treatment | PASSIVATE OVERALL |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Material | STEEL COMP XM-13 OVERALL |
| Head Major Diameter | 0.179 INCHES NOMINAL 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 |
|---|---|
| VLB257-4A8 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 93873-4A8 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| AIC3059S4A8 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| 3M1261C4A8 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5320-01-581-4657 is a Pin-Rivet, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5320, Rivets. Status: active.
NSN 5320-01-581-4657 has 3 manufacturer part numbers on file: VLB257-4A8 (Howmet Global Fastening Systems Inc), 93873-4A8 (Sps Technologies, Llc Dba PB Fasteners), AIC3059S4A8 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for VLB257-4A8: Shank Diameter: 0.125 INCHES NOMINAL IN; Surface Treatment Document and Classification: ASM-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Material Document and Classification: ASM 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Head Style: FLUSH COUNTERSUNK. 10 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.