The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-347-4305, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Kirby Morgan Dive Systems Inc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-347-4305 |
| Primary Part Number | 550-040 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Kirby Morgan Dive Systems Inc |
| Status | ACTIVE |
| Width Across Flats | 0.750 INCHES NOMINAL IN |
| Criticality Code Justification | FEAT |
| Nut Height | 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 550-040 PRIMARY | Kirby Morgan Dive Systems Inc (USA) |
| 6318146 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| BK206640210 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 592-6318146 | 5/1 Secondary reference Naval Sea Systems Command |
| 6318146 | 5/9 Secondary reference Kirby Morgan Dive Systems Inc |
NSN 5310-01-347-4305 is a Nut,plain,hexagon, manufactured by Kirby Morgan Dive Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-347-4305 has 2 manufacturer part numbers on file: 550-040 (Kirby Morgan Dive Systems Inc), 6318146 (Naval Sea Systems Command).
Key specifications for 550-040: Width Across Flats: 0.750 INCHES NOMINAL IN; Criticality Code Justification: FEAT; Nut Height: 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN; Special Features: UNDERWATER LIFE SUPPORT IAW NAVSEA INSTRUCTION 10560.2B. 4 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.