The Parts Kit,seat, cataloged under National Stock Number 1680-00-858-4518, is classified within Federal Supply Class 1680 (Miscellaneous Aircraft Accessories and Components) of the Aircraft Components and Accessories group. The manufacturer of record is Sheffield Manufacturing, Inc.. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Parts Kit,seat |
| FSC / FSG | 1680 — Miscellaneous Aircraft Accessories and Components (FSG 16) |
| Manufacturers | Sheffield Manufacturing, Inc. (CAGE 9Z181) |
| Parameter | Value |
|---|---|
| NSN | 1680-00-858-4518 |
| Primary Part Number | 4251-25 |
| Item Name | Parts Kit,seat |
| FSC / FSG | 1680 / 16 — Miscellaneous Aircraft Accessories and Components |
| Manufacturer | Sheffield Manufacturing, Inc. |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 4251-25 PRIMARY | Sheffield Manufacturing, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 4251-25 | 3/2 Design control — primary reference U.S. Government activity |
| 4250-21 | 5/9 Secondary reference U.S. Government activity |
| 4251-25 | 5/9 Secondary reference U.S. Government activity |
NSN 1680-00-858-4518 is a Parts Kit,seat, manufactured by Sheffield Manufacturing, Inc., classified under FSC 1680, Miscellaneous Aircraft Accessories and Components. Status: active.
NSN 1680-00-858-4518 has 1 manufacturer part number on file: 4251-25 (Sheffield Manufacturing, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4710-01-572-3360, 6685-01-661-9460. Verify interchangeability with system specifications before substitution.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1680-00-858-4518 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.