The Nut,plain,slotted,hexagon, cataloged under National Stock Number 5310-00-208-9209, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-208-9209 |
| Primary Part Number | 153668B |
| Item Name | Nut,plain,slotted,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Width Across Flats | 0.422 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Nut Counterbore Depth | 0.078 INCHES MINIMUM AND 0.109 INCHES MAXIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Counterbore Diameter | 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM NUT IN |
| Nut Height | 0.422 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN |
| Nut Style | SLOTTED, HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Bearing Surface Type | CHAMFERED OR 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 |
|---|---|
| 153668B | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| Reference | Meaning |
|---|---|
| P49901-23 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-208-9209 is a Nut,plain,slotted,hexagon, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-208-9209 has 1 manufacturer part number on file: 153668B (Lockheed Martin Corporation Div Rms - Mitchel Field).
Key specifications for 153668B: Width Across Flats: 0.422 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Nut Counterbore Depth: 0.078 INCHES MINIMUM AND 0.109 INCHES MAXIMUM NUT IN; Thread Direction: RIGHT-HAND. 12 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.