The Disk,solid,plain, cataloged under National Stock Number 5340-00-597-4166, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5340-00-597-4166 |
| Primary Part Number | S661 |
| Item Name | Disk,solid,plain |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Material Document and Classification | MIL-F-5656 MIL SPEC SINGLE MATERIAL RESPONSE |
| Diameter | 2.6875 INCHES NOMINAL IN |
| Thickness | 1.000 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| S661 PRIMARY | Northrop Grumman Systems Corporation (USA) |
NSN 5340-00-597-4166 is a Disk,solid,plain, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-597-4166 has 1 manufacturer part number on file: S661 (Northrop Grumman Systems Corporation).
1 possible match (shared part number, not a government interchangeability claim): 6515-00-946-7161. Verify interchangeability with system specifications before substitution.
Key specifications for S661: Material Document and Classification: MIL-F-5656 MIL SPEC SINGLE MATERIAL RESPONSE; Diameter: 2.6875 INCHES NOMINAL IN; Special Features: MATERIAL: FELT; Thickness: 1.000 INCHES NOMINAL IN. 3 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.