The Thumbscrew, cataloged under National Stock Number 5305-01-289-9143, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Eci Defense Group, Inc. Dba Eci Defense Group 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Thumbscrew |
| FSC / FSG | 5305 — Screws (FSG 53) |
| Manufacturers | Eci Defense Group, Inc. Dba Eci Defense Group Inc (CAGE 3SDB5) |
| Parameter | Value |
|---|---|
| NSN | 5305-01-289-9143 |
| Primary Part Number | 20040-A |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Eci Defense Group, Inc. Dba Eci Defense Group Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 20040-A PRIMARY | Eci Defense Group, Inc. Dba Eci Defense Group Inc (USA) |
| Reference | Meaning |
|---|---|
| 20040-A | 5/9 Secondary reference Allegheny Valve Co |
| TKG5272 | 5/9 Secondary reference Allegheny Valve Co |
| 20040-A | C/1 Advisory reference — outside the item-of-supply concept Betts Industries, Inc. |
NSN 5305-01-289-9143 is a Thumbscrew, manufactured by Eci Defense Group, Inc. Dba Eci Defense Group Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-289-9143 has 1 manufacturer part number on file: 20040-A (Eci Defense Group, Inc. Dba Eci Defense Group Inc).
1 possible match (shared part number, not a government interchangeability claim): 2040-01-644-3051. 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.
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.