The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-291-3603, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Esna, Llc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Esna, Llc (CAGE 019L2) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-291-3603 |
| Primary Part Number | 21NTU-066 |
| Item Name | Nut,self-Locking,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Esna, Llc |
| 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 |
|---|---|
| 21NTU-066 PRIMARY | Esna, Llc (USA) |
| Reference | Meaning |
|---|---|
| 015338T | 5/9 Secondary reference Kovatch Corp. |
| 21NTU-066 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 21NTU-066 | 3/9 Design control — primary reference Sps Technologies, Llc Dba PB Fasteners |
| 06576 | 5/9 Secondary reference Fire Combat, Inc. |
| 21NTU066 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-01-291-3603 is a Nut,self-Locking,hexagon, manufactured by Esna, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-291-3603 has 1 manufacturer part number on file: 21NTU-066 (Esna, Llc).
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.