The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-099-7978, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fischer Special Mfg Co. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-099-7978 |
| Primary Part Number | 40809-09 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fischer Special Mfg Co |
| Status | ACTIVE |
| Width Across Flats | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNS |
| Thread Pitch Diameters | +0.5107 TO 0.5152 INCHES IN |
| Material Document and Classification | QQ-B-626,1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.531 INCHES IN |
| Nut Height | 0.078 INCHES NOMINAL IN |
| Surface Treatment | OXIDE OVERALL |
| Nut Style | HEXAGON |
| Thread Quantity Per Inch | 32 |
| Material | COPPER ALLOY 360 OVERALL |
| Bearing Surface Type | CHAMFERED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 40809-09 PRIMARY | Fischer Special Mfg Co (USA) |
| Reference | Meaning |
|---|---|
| 223048-003 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5310-01-099-7978 is a Nut,plain,hexagon, manufactured by Fischer Special Mfg Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-099-7978 has 1 manufacturer part number on file: 40809-09 (Fischer Special Mfg Co).
Key specifications for 40809-09: Width Across Flats: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNS; Thread Pitch Diameters: +0.5107 TO 0.5152 INCHES IN. 13 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.