The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-474-3639, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is United Technologies Corp Electro Systems Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-474-3639 |
| Primary Part Number | NT503-3 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | United Technologies Corp Electro Systems Inc |
| Status | ACTIVE |
| Width Across Flats | 0.3020 INCHES MINIMUM AND 0.3125 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.138 INCHES IN |
| Nut Height | 0.102 INCHES MINIMUM AND 0.114 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 32 |
| Material | COPPER ALLOY 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 |
|---|---|
| NT503-3 PRIMARY | United Technologies Corp Electro Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| NT52122 | 5/9 Secondary reference Adams Aircraft International Inc |
| NT52122 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| NT503-3 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
NSN 5310-00-474-3639 is a Nut,plain,hexagon, manufactured by United Technologies Corp Electro Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-474-3639 has 1 manufacturer part number on file: NT503-3 (United Technologies Corp Electro Systems Inc).
Key specifications for NT503-3: Width Across Flats: 0.3020 INCHES MINIMUM AND 0.3125 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.138 INCHES IN. 10 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.