The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-281-6340, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Unison Industries Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-281-6340 |
| Primary Part Number | 2799 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Unison Industries Llc |
| Status | ACTIVE |
| Width Across Flats | 0.180 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Material Document and Classification | SAE 72 ASSN STD 1ST MATERIAL RESPONSE OR SAE 70 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.086 INCHES IN |
| Nut Height | 0.057 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Surface Treatment | NICKEL OVERALL |
| Countersink Angle | 108.0 DEGREES MINIMUM AND 112.0 DEGREES MAXIMUM NUT |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 56 |
| Material | COPPER ALLOY 360 OR COPPER ALLOY 655 OVERALL |
| Bearing Surface Type | WASHER FACED |
| 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 |
|---|---|
| 2799 PRIMARY | Unison Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| 2799 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-281-6340 is a Nut,plain,hexagon, manufactured by Unison Industries Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-281-6340 has 1 manufacturer part number on file: 2799 (Unison Industries Llc).
2 possible matches (shared part number, not a government interchangeability claim): 5365-01-142-5751, 5940-01-413-9335. Verify interchangeability with system specifications before substitution.
Key specifications for 2799: Width Across Flats: 0.180 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Material Document and Classification: SAE 72 ASSN STD 1ST MATERIAL RESPONSE OR SAE 70 ASSN STD 2ND MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 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.