The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-581-7556, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The American Society of Mechanical Engineers. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-581-7556 |
| Primary Part Number | AEN20M12D000GD9A9I |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The American Society of Mechanical Engineers |
| Status | ACTIVE |
| Width Across Flats | 20.2 MILLIMETERS MINIMUM AND 21.0 MILLIMETERS MAXIMUM MM |
| Surface Treatment Document and Classification | QQ-Z-325, TY II, CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | M |
| Thread Pitch in Millimeters | 1.75 |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 12.0 MILLIMETERS MM |
| Nut Height | 11.9 MILLIMETERS MINIMUM AND 12.3 MILLIMETERS MAXIMUM MM |
| Surface Treatment | ZINC OVERALL |
| Nut Style | HEXAGON |
| Material | STEEL PROPERTY CLASS 10.9 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 |
|---|---|
| AEN20M12D000GD9A9I PRIMARY | The American Society of Mechanical Engineers (USA) |
| Reference | Meaning |
|---|---|
| B18246B12 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-581-7556 is a Nut,plain,hexagon, manufactured by The American Society of Mechanical Engineers, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-581-7556 has 1 manufacturer part number on file: AEN20M12D000GD9A9I (The American Society of Mechanical Engineers).
Key specifications for AEN20M12D000GD9A9I: Width Across Flats: 20.2 MILLIMETERS MINIMUM AND 21.0 MILLIMETERS MAXIMUM MM; Surface Treatment Document and Classification: QQ-Z-325, TY II, CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: M; Thread Pitch in Millimeters: 1.75. 11 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.